Seaweed Extracts Research Articles

Aqueous Seaweed Extract Alleviates Salinity-Induced Toxicities in Rice Plants (Oryza sativa L.) by Modulating Their Physiology and Biochemistry

Around the world, salinity a critical limiting factor in agricultural productivity. Plant growth is affected by salt stress at all stages of development. The contemporary investigation focused on Chaetomorpha antennina aqueous extracts (SWEs) to decrease the effects of salt strain on rice germination, growth, yield, and the production of key biological and biochemical characters of the rice, Oryza sativa L. (Poaceae). SWE improved the germination capacities of rice seedlings by promoting their emergence 36.27 h prior to those that had been exposed to saline stress. The creation of 79.647% longer radicles by SWE treatment on salt-stressed seeds which boosted the establishment effectiveness of seeds produced under salt stress longer radicles resulted in plants that were 64.8% taller. SWE treatment was effective in revoking the levels of protein (26.9%), phenol (35.54%), and SOD (41.3%) enzyme levels that were previously constrained by salinity stress. Additionally, SWE were also efficient in retaining 82.6% of leaf water content and enhancing the production of photosynthetic pigments affected by salt exposure earlier. The improvement in plant functionality was evident from the display of increase in tiller numbers/hill (62.36%), grain yield (58.278%), and weight (56.502%). The outcome of our research shows that SWEs protected the plants from the debarring effects of salinity by enhancing the plant functionality and yield by mechanistically enriching their physiological (germination and vegetative growth) and biochemical attributes (leaf RWC, photosynthetic pigments, protein, phenol, and SOD). Despite the increase in TSS and starch levels in rice grain exposed to salinity stress, SWE improved the grain protein content thus cumulatively enhancing rice nutrition and marketability. The current investigation reveals that the extracts of C. antennina can help alleviate rice plants from salt stress in an efficient, eco-friendly, as well as economical way.

Seasonal Changes in Chemical Profile and Antioxidant Activity of Padina pavonica Extracts and Their Application in the Development of Bioactive Chitosan/PLA Bilayer Film

Seaweeds are a potentially sustainable source of natural antioxidants that can be used in the food industry and possibly for the development of new sustainable packaging materials with the ability to extend the shelf-life of foods and reduce oxidation. With this in mind, the seasonal variations in the chemical composition and antioxidant activity of brown seaweed (Padina pavonica) extracts were investigated. The highest total phenolic content (TPC) and antioxidant activity (measured by ferric reducing/antioxidant power (FRAP), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging, and oxygen radical absorbance capacity (ORAC)) were found for P. pavonica June extract. The TPC of 26.69 ± 1.86 mg gallic acid equivalent/g, FRAP of 352.82 ± 15.41 µmole Trolox equivalent (TE)/L, DPPH of 52.51 ± 2.81% inhibition, and ORAC of 76.45 ± 1.47 µmole TE/L were detected. Therefore, this extract was chosen for the development of bioactive PLA bilayer film, along with chitosan. Primary or quaternary chitosan was used as the first layer on polylactic acid (PLA) films. A suspension of chitosan particles with entrapped P. pavonica extract was used as the second layer. X-ray photoelectron spectroscopy confirmed the presence of layers on the material surface. The highest recorded antioxidant activity of the newly developed films was 63.82% inhibition. The developed functional films exhibited antifogging and antioxidant properties, showing the potential for application in the food industry.

The Alleviation Effects of Biostimulants Application on Lettuce Plants Grown under Deficit Irrigation

Τhe aim of this study was to examine the potential of using biostimulants for the amelioration of deficit irrigation effects on field-grown lettuce plants growth parameters (cv. Doris (Romaine type) and cv. Manchester (Batavia type)). Therefore, five biostimulatory products that differed in their composition were evaluated, including seaweed extracts, amino acids, humic and fulvic acids, macronutrients, Si, and vegetable proteins, while a control treatment with no biostimulants applied on plants was also considered. Plants were subjected to three irrigation regimes, e.g., rain-fed plants (RF), deficit irrigation (I1; 50% of field capacity) and normal irrigation (I2; 100 of field capacity). The results indicate that the application of seaweed extracts, macronutrients, and amino acids (SW treatment) alleviated the negative effects of deficit irrigation on plant growth and chlorophyll content of Romaine-type plants. On the other hand, Batavia-type plants were more susceptible to water stress, since the highest crop yield plant was observed under the full irrigation treatment and the application of vegetal proteins and amino acids (VP treatment). In general, the application of biostimulants on the Romaine type improved plant growth under water shortage conditions compared with fully irrigated plants in almost all measurements, whereas the Batavia-type plants appeared to be more sensitive to deficit irrigation. Therefore, the ecofriendly practices of deficit irrigation and biostimulant application could be useful in leafy vegetable production on a genotype-depended manner.

Red seaweed extracts reduce methane production by altering rumen fermentation and microbial composition in vitro.

A series of in vitro batch culture incubations were carried out to investigate changes in rumen fermentation characteristics, methane (CH4) production, and microbial composition in response to supplementation with five different red seaweed species (Amphiroa anceps, AANC; Asparagopsis taxiformis, ATAX; Chondracanthus tenellus, CTEN; Grateloupia elliptica, GELL; and Gracilaria parvispora, GPAR). Prior to the incubations, the total flavonoid and polyphenol content of the red seaweed extracts was quantified. The incubated substrate consisted of timothy hay and corn grain [60:40 dry matter (DM) basis]. Treatments were substrate mixtures without seaweed extract (CON) or substrate mixtures supplemented with 0.25 mg/mL of red seaweed extract. Samples were incubated for 6, 12, 24, 36, and 48 h. Each sample was incubated in triplicates in three separate runs. In vitro DM degradability, fermentation parameters (i.e., pH, volatile fatty acids, and ammonia nitrogen), total gas production, and CH4 production were analyzed for all time points. Microbial composition was analyzed using 16S rRNA amplicon sequencing after 24 h of incubation. The highest CH4 reduction (mL/g DM, mL/g digested DM, and % of total gas production) was observed in ATAX (51.3, 50.1, and 51.5%, respectively, compared to CON; P < 0.001) after 12 h of incubation. The other red seaweed extracts reduced the CH4 production (mL/g DM; P < 0.001) in the range of 4.6-35.0% compared to CON after 24 h of incubation. After 24 h of incubation, supplementation with red seaweed extracts tended to increase the molar proportion of propionate (P = 0.057) and decreased the acetate to propionate ratio (P = 0.033) compared to the CON. Abundances of the genus Methanobrevibacter and total methanogens were reduced (P = 0.050 and P = 0.016) by red seaweed extract supplementation. The linear discriminant analysis effect size (P < 0.05, LDA ≥ 2.0) showed that UG Succinivibrionaceae, Anaeroplasma, and UG Ruminococcaceae, which are associated with higher propionate production, starch degradation, and amylase activity were relatively more abundant in red seaweed extracts than in the CON. Our results suggest that supplementation with red seaweed extracts altered the microbiota, leading to the acceleration of propionate production and reduction in CH4 production.

Larvicidal Efficacy of a Tropical Seaweed (Dictyota ciliolata) Extracts on Vectorial Mosquito Species and Non-Target Effect on Guppy Fish (Poecilia reticulata)

Extracts of seaweeds are promising candidates for eco-friendly, safe, and biodegradable larvicides and as alternatives to chemical larvicides used in mosquito control strategies. This study evaluated the larvicidal effects of Dictyota ciliolata on the mosquito larvae of Aedes aegypti, Anopheles gambiae, and Culex quinquefasciatus. The seaweed was extracted using ethanol and methanol. The larvicidal assays were conducted per WHO standards by exposing twenty 4th instar larvae to 100, 200, 300, 400, 500, and 600 mg/L of the derived extracts. The LC50 and LC95 values were obtained by calculating the probit values of the observed mortalities. LC50 of the ethanolic and methanolic extracts of Dictyota ciliolata against Anopheles gambiae larvae were 238.45 mg/L and 497.28 mg/L respectively; 179.02 mg/L and 224.96 mg/L respectively against Aedes aegypti, and 167.49 mg/L and 226.69 mg/L respectively for Culex quinquefasciatus. The results established that ethanolic and methanolic seaweed extracts were most influential on Culex quinquefasciatus followed by Aedes aegypti and Anopheles gambiae. Although mortalities were recorded for Poecilia reticulata, such may not be enough to de-emphasize the observed larvicidal potentials of Dictyota ciliolata as some other factors could have been responsible for the said mortalities in the non-target species.

Chicory Taproot Production: Effects of Biostimulants under Partial or Full Controlled Environmental Conditions

Two trials were conducted on chicory (Cichorium intybus L.) grown under greenhouse and growth chamber conditions with the aim to evaluate the potential of three biostimulants (seaweed extract (SWE), animal-derived protein hydrolysate (APH), and vegetal-derived protein hydrolysate (VPH) on improving quali-quantitative traits of taproot, in short and out-of-season production cycles. In the greenhouse trial, VPH biostimulant promoted the inulin yield on a per-hectare basis with respect to the untreated control and APH. Taproot fresh weights, dry weights, and diameter in VPH-treated plants increased in comparison with APH-treated ones. SWE-treated plants showed intermediate values of the root production parameters and the inulin yield, with no statistical difference with VPH, APH, and control. In the growth room trial, SWE, VPH, and control showed no significant differences in growth, root yield, and quality. The results demonstrated that VPH can be useful for improving root production and inulin yield of chicory under partial controlled conditions such as in a greenhouse, whereas no benefits of biostimulant applications on crop yield and quality traits were recorded in growth chambers under full control of micro-climate conditions.

Cleaner production technologies for the amelioration of soil health, biomass and secondary metabolites in Ocimum basilicum L. under Indian Western Himalaya.

Ocimum basilicumL. and its derived products are primarily consumed by humans; hence, agrochemical use seems inappropriate for its cultivation. However, farmers are accustomed to using rampant inorganic fertilizers to augment crop productivity, which has unintendedly engendered severe environmental perturbations. Concomitantly, farmers will soon have to confront the challenges of growing crops under suboptimal conditions driven by global climate change. Consequently, to develop a clean, sustainable, and resilient production technology, field experiments spanning over two years (2020 and 2021) were conducted, comprising three biostimulants,viz., vermicompost (0, 4, and 8 Mg ha-1), biofertilizer (uninoculated and inoculated), and liquid seaweed extract (without and at 7ml L-1) in the Indian western Himalaya for the first time. Soil health indicators, leaf photosynthetic pigments, gaseous exchange, mineral contents, essential oil (EO) quantity, and composition were evaluated. Soil microbial respiration (SMR), microbial biomass carbon (MBC), organic carbon (OC), dehydrogenase (DHA), alkaline phosphatase (ALP), and β-glucosidase activities were increased by 36.23, 83.98, 30.61, 42.69, 34.00, and 40.57%, respectively, when compared with the initial soil status. The net photosynthetic rate (Pn) was significantly increased with the highest (8 Mg ha-1) and moderate (4 Mg ha-1) vermicompost dosages by 13.96% and 4.56%, respectively, as compared with the unfertilized control (0 Mg ha-1). Likewise, the biofertilizer and seaweed extract also enhanced Pn by 15.09% and 10.09%, respectively. The crop's key EO constituents,viz., methyl chavicol and linalool, were significantly improved with the highest and moderate vermicompost rates of 2.71, 9.85%, and 1.18, 5.03%, respectively. Similarly, biofertilization and seaweed application also boosted methyl chavicol and linalool by 3.29, 8.67%, and 1.93, 3.66%, respectively. In both years, significantly higher herbage (8.86 and 11.25 Mg ha-1) and EO yield (113.78 and 154.87kg ha-1) were recorded with a congregate treatment of the highest vermicompost dose, biofertilizer, and liquid seaweed extract. In conclusion, the integrated use of biostimulants having complementary properties can sustainably maximize the quantity and quality ofO. basilicumand concomitantly ameliorate soil health. This study can inspire scientific communities and industries to develop second-generation biostimulant products, delivering better sustainability and resilience for a renaissance in agriculture.

The influence of fermentation using marine yeast Hortaea werneckii SUCCY001 on antibacterial and antioxidant activity of Gracilaria verrucosa

Abstract. Fatmawati F, Sibero T, Trianto A, Wiyanti DP, Sabdono A, Pronggenies D, Radjasa OK. 2022. The influence of fermentation using marine yeast Hortaea werneckii SUCCY001 on antibacterial and antioxidant activity of Gracilaria verrucosa. Biodiversitas 23: 5258-5266. Gracilaria verrrucosa is producer of agar, a polysaccharide, that widely used in pharmaceutical and food industries. However, several studies have shown that the secondary metabolite of this seaweed is not potential as an antimicrobial and antioxidant agents. This study aimed to determine the antibacterial and antioxidant properties of methanolic extract of G. verrucosa after fermentation using marine yeast Hortaea werneckii SUCCY001. The samples were fermented based on different optimization times, specially in three, six and nine days. Samples were extracted using methanol by maceration method. Then the extracts were tested for antimicrobial potential against the several human clinical pathogens namely Bacillus cereus, Bacillus subtilis, Escherichia coli, Micrococcus luteus and Pseudomonas aeruginosa. The antioxidant potential was analyzed using the 1,1-diphenyl-2-picrylhydracyl (DPPH) and 2,2-Azinobis 3-ethyl benzothiazoline 6- sulfonic acid (ABTS) method while total phenolic content (TPC) was measured using Folin-Ciocalteu. Secondary metabolites were characterized using thin layer chromatography (TLC) and GC-MS. TLC plate visualization using UV light, DPPH, FeCl3 and vanillin-sulfuric acid reagents. The results showed that the extract fermented for nine days was able to inhibit the growth of P. aeruginosa and M. luteus at a concentration of 2 mg/mL. The highest antioxidant activity was found in the nine days fermented extract with an RSA value of 21.9% ± 0,0001 for DPPH and 12.53 % ± 0.002 for ABTS. Furthermore, the highest total phenolic content was found in the nine days fermented extract of 7.57 GAE/mg. The results of characterization using TLC showed the presence of phenolic compounds, terpenoids and antioxidants in fresh seaweed extracts, autoclaved fresh seaweed, three days of fermentation, six days and nine days. Based on this research, it can be seen that the addition of marine yeast starter H. werneckii SUCCY001 was able to increase the antibacterial and antioxidant activity of G. verrucosa.

The influence of fermentation using marine yeast Hortaea werneckii SUCCY001 on antibacterial and antioxidant activity of Gracilaria verrucosa

Abstract. Fatmawati F, Sibero T, Trianto A, Wiyanti DP, Sabdono A, Pronggenies D, Radjasa OK. 2022. The influence of fermentation using marine yeast Hortaea werneckii SUCCY001 on antibacterial and antioxidant activity of Gracilaria verrucosa. Biodiversitas 23: 5258-5266. Gracilaria verrrucosa is producer of agar, a polysaccharide, that widely used in pharmaceutical and food industries. However, several studies have shown that the secondary metabolite of this seaweed is not potential as an antimicrobial and antioxidant agents. This study aimed to determine the antibacterial and antioxidant properties of methanolic extract of G. verrucosa after fermentation using marine yeast Hortaea werneckii SUCCY001. The samples were fermented based on different optimization times, specially in three, six and nine days. Samples were extracted using methanol by maceration method. Then the extracts were tested for antimicrobial potential against the several human clinical pathogens namely Bacillus cereus, Bacillus subtilis, Escherichia coli, Micrococcus luteus and Pseudomonas aeruginosa. The antioxidant potential was analyzed using the 1,1-diphenyl-2-picrylhydracyl (DPPH) and 2,2-Azinobis 3-ethyl benzothiazoline 6- sulfonic acid (ABTS) method while total phenolic content (TPC) was measured using Folin-Ciocalteu. Secondary metabolites were characterized using thin layer chromatography (TLC) and GC-MS. TLC plate visualization using UV light, DPPH, FeCl3 and vanillin-sulfuric acid reagents. The results showed that the extract fermented for nine days was able to inhibit the growth of P. aeruginosa and M. luteus at a concentration of 2 mg/mL. The highest antioxidant activity was found in the nine days fermented extract with an RSA value of 21.9% ± 0,0001 for DPPH and 12.53 % ± 0.002 for ABTS. Furthermore, the highest total phenolic content was found in the nine days fermented extract of 7.57 GAE/mg. The results of characterization using TLC showed the presence of phenolic compounds, terpenoids and antioxidants in fresh seaweed extracts, autoclaved fresh seaweed, three days of fermentation, six days and nine days. Based on this research, it can be seen that the addition of marine yeast starter H. werneckii SUCCY001 was able to increase the antibacterial and antioxidant activity of G. verrucosa.

Effect of Foliar Spray of Seaweed Extract and Humic Acid on Growth and Yield of Cluster Beans [Cyamopsis tetragonoloba (L.) Taub.] var. Pusa Navbahar

Cluster bean [Cyamopsis tetragonoloba (L.) Taub.], known commonly as “Guar,” is a vital legume crop grown mostly under rainfed conditions in arid and semi-arid regions of India during the Kharif and summer season. Numerous horticultural strategies may be used to improve the growth and productivity of guar including sea weed extract and humic acid. A field experiment was conducted to determine the influence of seaweed extract and humic acid on growth, yield and post-harvest characteristics of cluster bean. Seaweed extract and humic acid were administered in the field as foliar spray at 0.1, 0.2 and 0.3 per cent concentrations in a randomized block design (RBD) consisting of seven treatments and three replicates. The results indicated that the higher concentration of 0.3 per cent seaweed extract and humic acid produced significantly higher plant height, leaf number, pod number per plant and total yield per hectare as compared to the lower concentrations and control. The post-harvest study revealed that foliar treatment of 0.3 per cent humic acid and seaweed extract resulted in a lower percentage of physiological weight loss and increased the shelf life of pods compared to untreated.

Plant biostimulants from seaweeds or vegetal proteins enhance the salinity tolerance in greenhouse lettuce by modulating plant metabolism in a distinctive manner

The use of plant biostimulants such as seaweed extracts (SWE) and protein hydrolysates (PH) has grown in the recent years due to their beneficial effects on yield under both optimal and sub-optimal conditions such as salt stress. The comprehension of the mode of action of these two important categories of biostimulants on plant performance will allow to use them more efficiently under different growth conditions. This study aimed to examine the efficacy of a seaweed and plant-based biostimulants on greenhouse lettuce (Lactuca sativa L.) grown under non-saline (0 mM NaCl) and saline conditions (40 mM NaCl) in terms of growth, yield, SPAD index, leaf mineral composition and metabolomic profiling. Shoot fresh weight of lettuce was reduced by 15.3% under 40 mM of NaCl. Nonetheless, it was boosted by both used biostimulants by 9 and 18%, on average, under 0 and 40 mM NaCl salinity, respectively. Na content under saline conditions was reduced in the presence of the biostimulants treatment, where PH reduced it significantly by 15.6% and SWE by 9.4%. On the other hand, Cl content was significantly reduced only under PH treatment. Both biostimulants elicited a broad metabolic reprogramming, involving the accumulation of stress-related compounds such as glucosinolates, terpenoid phytoalexins, and jasmonates. Interestingly, distinctive metabolomic signatures could be observed following the application of the different biostimulants under salinity conditions. In more detail, PH promoted the accumulation of glucosinolates and phytoalexins precursors, while SWE induced a down accumulation of secondary metabolites. Our findings indicate different processes being modulated by PH and SWE, with possible synergistic effects, thus paving the way towards integrated strategies to alleviate the detrimental effects of salinity in lettuce.

Alleviate the Drought Stress on Triticum aestivum L. Using the Algal Extracts of Sargassum latifolium and Corallina elongate Versus the Commercial Algal Products.

Herein, two seaweed extracts (Sargassum latifolium and Corallina elongate), and two commercial seaweed products (Canada power and Oligo-X) with a concentration of 5% were used to alleviate the drought stress on wheat plants. The extract of C. elongate had the highest capacity to ameliorate the deleterious effects of water scarcity followed by S. latifolium and the commercial products. The drought stress reduced wheat shoots length and the contents of pigments (chlorophyll and carotenoids), carbohydrates, and proteins. While the highest increment in the total carbohydrates and protein contents of the wheat shoot after two stages, 37-and 67-days-old, were noted in drought-stressed plants treated with C. elongate extract with values of (34.6% and 22.8%) and (51.9% and 39.5%), respectively, compared to unstressed plants. Decreasing the activity of antioxidant enzymes, peroxidase, superoxidase dismutase, and polyphenol oxidase in drought-stressed plants treated with algal extracts indicated amelioration of the response actions. Analysis of phytohormones in wheat plants exhibited increasing GA3 and IAA contents with percentages of (20.3-13.8%) and (72.7-25%), respectively. Interestingly, all morphological and metabolic characteristics of yield were improved due to the algal treatments compared with untreated drought-stressed plants. Overall, the algal extracts, especially those from seaweed of C. elongate, could represent a sustainable candidate to overcome the damage effects of water deficiency in the wheat plant.

The Addition of Seaweed Extract (Sargassum sp) as Fertilizer on Culture Media on The Total Density of Skeletonema costatum Cells

Microalgae Skeletonema costatum is a natural food that contains nutrients needed for aquaculture. Seaweed contains several nutrients and has body regulatory substances, namely auxin, gibberellin and cytokinin which are useful for increasing the growth of microalgae cells, including S. costatum. The study aims to examine the addition of Sargassum sp. on culture media on cell density of S. costatum. The benefit of this study is to obtain scientific information regarding the addition of Sargassum sp., thus, it can be a natural fertilizer that can be used in the economical cultivation of S. costatum. This study consisted of 5 treatments, namely the concentration of Sargassum sp. extract in media (control) 0 mg/500 mL, 25 mg/500 mL, 50 mg/500 mL, 75 mg/500 mL and a concentration of 100 mg/500 mL, these treatments were repeated three times. S. costatum cell density was checked every 6 hours. The results showed that the use of extracts of Sargassum sp. 100 mg/500 mL had the highest cell density of S. costatum (2.08×107 cells/mL), followed by 75 mg/500 mL (2.00×107 cells/mL), 50 mg/500 mL (1.99×107 cells/mL, 25 mg/500 mL (1.97×107 cells/mL), and 0 mg/500 mL (1.05×107 cells/mL).

Antioxidant and Anti-Inflammatory Potential of Seaweed Extracts as Functional Ingredients

The use of seaweed as a source of bioactive extracts has received increased attention from the market in recent years—particularly for nutraceutical applications. In this context, this study evaluated the nutraceutical application of seaweed biomass and extracts from three seaweeds from Portugal: Ulva sp., Laminaria ochroleuca, and Chondrus crispus. For each of the said seaweeds, four different extracts were obtained using GRAS solvents—acetone (A), ethanol (E), ethanol–water (1:1) (EW), and one polysaccharide-rich extract (P) using water and further precipitation with ethanol. The bioactive potential of the extracts was assessed in terms of antioxidant capacity (ABTS•+, DPPH•, •NO, O2•− scavenging, and ORAC-FL assay) and anti-inflammatory capacity (COX inhibition and human red blood cell membrane stabilisation). Furthermore, the biochemical profile was determined for the raw biomass and extracts to better comprehend their possible applications as nutraceuticals. The results show that all extracts have antioxidant potential. Five extracts (L. ochroleuca E, EW, and P and Ulva sp. E and P) showed anti-inflammatory capacity. Overall, L. ochroleuca EW extract exhibited the most promising potential as both an antioxidant and anti-inflammatory and is an interesting candidate nutraceutical ingredient.

Bio-conversion of Shellwaste and Seaweed Extract into Compost Preparation and its Plant Development

Bio-composts are minimal expense, biodegradable manures, which are being utilized to work on the qualityand ripeness of the dirt. They are utilized as an option for chemical composts. Lately, bio-energizers, forexample algal extracts, have a ton of consideration in the last rot since it goes about as manufactured itemsthat is competent to invigorate plant development, stress obstruction and increment yield, subsequentlybeing Integrated agriculture system. Marine debris contains proteins, carbohydrates and raw materialswhich give supplement to the top soil. In the present work comparative study on shell waste and seaweedextract mixed with vermi compost were used as nutritional enhancements to plants. A plastic potarrangement with mud was utilized to decide the impacts and effectiveness level of vermi-manure on thedevelopment and yields of coriander. This study was directed through impact of expanding grouping ofvermi-fertilizer (P0 = control (Vermi manure), P1= shell waste+ vermin manure, P2=seaweed extract +vermin fertilizer) in target plant development. The acquired outcomes from the current exploration showedthat vermi-manure + seaweed extract had essentially further developing impacts on better developmentand advancement of plant contrasted with control and shell waste. Consequently, it might be proposedthat treated plants, with this vermi-fertilizer and seaweed extract expanded the development, yield and theabove biochemical compositions and also pH of the mud. In conclusion, this study exhibits the significanceof seaweed extract to increase growth and quality of coriander plants.

Antioxidant and Antibacterial Activity of Caulerpa Flour (Caulerpa lentifera) as Functional Food Raw Material

Aims: This research aims to study the process of making Caulerpa seaweed flour and extract; analyzed the antioxidant activity and inhibitory antibacterial activity of Caulerpa flour.&#x0D; Study Design: The experimental design used in the first stage is the T-test by comparing the two washing treatments (3 times and 5 times), and in the second stage using a Completely Randomized Design.&#x0D; Place and Duration of Study: The present study was conducted in Department of Aquatic Product Processing and Storage, Pangkep State Polytechnic of Agriculture. The duration of research is 6 month i.e from April, 2022 – September, 2022.&#x0D; Methodology: The drying method is carried out by weighing fresh Caulerpa lentifera. samples and spread them on a baking sheet and in an oven to dry at 50°C. Caulerpa lentifera, which has been in powder form, will be analyzed for its antioxidant and antimicrobial properties. The extraction process will also be carried out on Caulerpa lentifera flour and analyzed for its antioxidant and antimicrobial properties.&#x0D; Results: The results of the first phase of the study showed that the 5 times washing process on Caulerpa seaweed resulted in better quality than 3 times washing with an antioxidant value of 115.36 ppm, the water content of 9.9%; ash content of 23.65%; Ca levels of 152.4 mg/100 g; fiber 41.24%; Iodine 31.08 g/g and 4.16% yield. Caulerpa flour had the highest antioxidant and antibacterial activity compared to ethyl acetate and methanol with a value of 115.36 mg/L and an inhibitory diameter of 6.88 mm against Escherichia coli.&#x0D; Conclusion: The antioxidant activity of seaweed flour is in the medium category and has an inhibitory power against pathogenic bacteria E.coli, so it has the potential as a functional food.

ANTI-DIABETIC POTENTENTAL OF Spatoglossum asperum (BROWN SEAWEED); INSILICO MODEL

This study used GC-MS analysis and computational biology to examine the diabetic effect of bioactive substances obtained from brown seaweed. Using AutoDock/Vina in Pymol 4.2, the molecular docking of Spatoglossum asperum on the human PPAR- protein was determined and compared to that of the well-known PPAR- agonist Gilbenclamide. The analysis the active components of seaweed extracts is the main focus of the current investigation. 12 substances were discovered using GC-MS analysis and evaluated using AutoDock/Vina against PPAR. Docking tests showed that the existing phytochemical 9-Octadecenoic Acid (Z)-, Octadecyl Ester, obtained from seaweed, has the highest fitness score of -398.9 kcal/mol and may therefore be a potent anti-diabetic drug. This study could result in the creation of brand-new marine nutraceuticals that use brown seaweed to treat a number of diseases.

Effect of seaweed extract and Evisect 50 WP pesticide on the population density of Bemisia tabaci and some characteristics of eggplant growth

The field experiment conducted at 2019 ingreenhouse of the college of agriculture, University of Anbar to study the effect of seaweed extracts and Evisect 50 WP pesticide on the population density of whitefly Bemisia tabaci and some characteristics of eggplant Solanum melongena L. growth. The population density nymphs and adults rate decreased at use the seaweed extracts after 60 days of transplanting compared with control treatments. This effect was reflected in increased of some vegetative characteristics as plant height, number of leaves per plant-1, dry shoot, and root weight. The same effect was recorded in chemical characters as chlorophyll (spad), Nitrogen (N%), Phosphorus (P%), and Potassium (K%) in the leaves. This experiment reached a reliable conclusion to the adoption of used natural materials as one of integrated pest management to reduce whitefly damage.

Effect of Urease Inhibitors and Nitrification Inhibitors Combined with Seaweed Extracts on Urea Nitrogen Regulation and Application

In order to improve the application effect of inhibitors, the combination of seaweed extracts (SE), urease inhibitors (UIs) and nitrification inhibitors (NIs) were added to urea fertilizers for providing a theoretical basis to develop the efficient stabilized nitrogen (N) fertilizer. The combinations were tested in outdoor pots with no N fertilizer (CK) and application of urea alone (U) as control, and SE, N-butyl phosphorothioate triamine (NBPT), 3,4-dimethylpyrazole phosphate (DMPP), 2-chloro-6-trimethylpyridine (CP), and combinations of SE with each of the three inhibitors were added to urea to make seven fertilizer prototypes. The results showed that the addition of inhibitors and SE could regulate the N transformation, enzyme activity and microbial biomass carbon (MBC) contents and significantly improve maize yield and N use efficiency (NUE) (p &lt; 0.05). Compared with the addition of inhibitor alone, the addition of SE was beneficial to N uptake by plants at the early growth stage of maize, but reduced the inhibitors effect; DMPP + S significantly increased the maize total biomass and NUE (p &lt; 0.05), and the grain yield, N uptake and NUE by 15.6%, 28.5% and 30.6%, respectively. Therefore, the addition of DMPP with SE to urea significantly improved yield when planting maize in loess areas.

Seaweed Extract Improves Growth and Productivity of Tomato Plants under Salinity Stress

Biostimulants constitute an emerging group of crop management products used to enhance productivity under abiotic stress conditions. The ability of some biostimulant products, such as seaweed extracts (SE), to enhance crop tolerance to salinity stress has been documented. SE contain a series of bioactive compounds and signaling molecules, as well as mineral and organic nutrients, that greatly benefit plants. A greenhouse experiment was conducted in order to evaluate SE-mediated tolerance mechanisms in tomato plants under salinity stress. The experiment was divided into two developmental phases (vegetative and reproductive) and included four treatments: control (plants with neither treatment), SE (plants treated with seaweed extract), NaCl (plants irrigated with 300 mM NaCl), and SE + NaCl (plants treated with seaweed extract and irrigated with 300 mM NaCl). Tomato plants treated with the SE from Padina gymnospora showed an increase in root and shoot length (18 cm and 13 cm), root and shoot area (33 cm2 and 98 cm2), and shoot and root fresh weight (1.0 and 3.8 g) under the control and salinity stress conditions. The decrease in productivity (number of fruits) associated with salinity stress was reduced from 28.7% to only 3.4% in SE-treated plants. The positive effects of SE application also included early flowering and enhanced fruit weight and quality. Our findings suggest that optimized photosynthetic performance and antioxidant defense systems (proline, total phenols, and flavonoids) appear to be major factors modulating SE responses to salinity tolerance in tomato plants with promising agricultural applications.