Polygonum Hydropiper Research Articles

Growth and reproductive responses of Polygonum hydropiper populations to elevational difference associated with flooding

Elevation can greatly affect both intensity and duration of flooding in riparian areas, and may thus affect the performance of plants distributed therein. However, few studies have examined the performance of riparian plants over elevation difference.This study compared growth and reproductive traits of populations of the riparian species Polygonum hydropiper distributed at low and high elevations of 10 different riparian locations in the hydro-fluctuation belt of the Three Gorges Reservoir Region, China.Both the location and the interaction between location and elevation had significant effects on almost all growth and reproduction traits of P. hydropiper, suggesting that the effects of elevation varied greatly among different locations. Across all locations, high-elevation plants had significantly higher total biomass, stem biomass, root biomass, and plant height than low-elevation plants. Correspondingly, high-elevation plants also had significantly higher stem starch concentrations. In comparison, low-elevation plants had significantly lower biomass, shorter height, and thinner leaves; while they had significantly higher reproductive allocation, as well as faster germination and higher germination rate at a number of locations. Therefore, low energy consumption and high reproductive capacity could be a survival adaption of low-elevation plants to frequent and deep flooding.Local conditions and/or flooding might impose strong selection pressure on P. hydropiper, thus resulting in intra-specific differentiation. Across all locations, low- and high-elevation populations exhibit different growth and reproduction responses to different flooding regimes.

ĐẶC ĐIỂM THÍCH NGHI CỦA CƠ QUAN SINH DƯỠNG CỦA MỘT SỐ LOÀI THỰC VẬT VEN SÔNG PHỔ BIẾN Ở HẠ LƯU SÔNG HÀ THANH, PHƯỜNG NHƠN BÌNH, THÀNH PHỐ QUY NHƠN, TỈNH BÌNH ĐỊNH

Các loài thực vật sống tại khu vực hạ lưu sông Hà Thanh, tỉnh Bình Định có những đặc điểm hình thái và giải phẫu thích nghi với môi trường sống ven sông. Nghiên cứu được thực hiện trên bốn loài thực vật thuộc lớp Ngọc Lan (Magnoliopsida) gồm hai loài thân gỗ là Tra (Hibiscus tiliaceus L.) và Giá (Excoecaria agallocha L.) và hai loài thân thảo là rau Mương đứng (Ludwigia octovalvis (Jacq.) Raven) và Nghể răm (Polygonum hydropiper L.) nhằm tìm hiểu đặc điểm hình thái và giải phẫu thích nghi bằng việc sử dụng phương pháp hình thái so sánh, vi phẫu, nhuộm kép, đo mẫu trên kính hiển vi, và chụp ảnh hiển vi rễ, thân, và lá cây. Kết quả cho thấy, các loài thực vật được nghiên cứu có tầng bần rất dễ bong tróc, vỏ thứ cấp thân có hệ thống lỗ vỏ dạng nốt sần hay những đường nứt dọc, và mô xốp phát triển (chiếm 33%-39% độ dày phiến lá) giúp tăng khả năng trao đổi khí cho cây. Rễ và thân có số lượng mạch gỗ ít (thấp nhất là 10.33 ± 0.67 mạch/mm2 ở rễ và 22.83 ± 0.75 mạch/mm2 ở thân) và đường kính lòng mạch rộng (lớn nhất là 179.17 ± 21.81µm ở rễ và 75 ± 9.13µm ở thân) phù hợp với môi trường sống được cung cấp đầy đủ nước ngọt. Các yếu tố cơ học trong rễ, thân, và lá cây rất phát triển: Sợi gỗ, sợi libe, và các tinh thể oxalat canxi giúp cây đứng vững trong điều kiện gió và bão.

Allelopathic potential of marshpepper residues for weed management and yield of transplant Aman rice

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during the period from June to December 2016 to evaluate the effect of marshpepper (Polygonum hydropiper L.) crop residues on weed management and crop performance of transplant aman rice. The experiment consisted of three cultivars viz. BR11, BRRI dhan33 and BRRI dhan49 and five marshpepper crop residues treatment such as 0, 1.0, 2.0, 3.0 ton ha-1 and hand weeding. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Five weed species belonging to four families infested the experimental plots. Weed population and weed dry weight were significantly affected by cultivar and crop residues treatment. The highest percent inhibition of all the studied weed was found by hand weeding. The second highest percent weed inhibition was found with the application of marshpepper residues at 3.0 t ha-1 which was 63.43, 63.43, 52.85, 52.40 and 59.12 percent for sabuj nakful (Cyperus difformis), chesra (Scirpus juncoides), shama (Echinochloa crusgalli) panikachu (Monochoria vaginalis) and panishapla (Nymphaea nouchali ) respectively. The maximum weed growth was noticed with the cultivar BRRI dhan33 variety and the minimum was found in the cultivar BRRI dhan49. The grain yield as well as the yield contributing characters produced by BRRI dhan49 was the highest among the studied varieties. The highest reduction of grain yield was obtained in no crop residue treatment. The highest number of effective tillers hill-1, number of grains panicle-1, 1000-grain weight, grain and straw yields were observed in marshpepper residues in hand weeding followed by 3.0 t ha-1 marshpepper crop residue. BRRI dhan49 produced the highest grain and straw yields under hand weeding followed by marshpepper residues 3.0 t ha-1 treatment. Results of this study indicate that marshpepper residues showed potentiality to inhibit weed growth and it has a significant effect on the yield of transplant aman rice. Therefore, marshpepper residues might be used as an alternative way for weed management effective and sustainable crop production.
 Progressive Agriculture 30 (4): 379-386, 2019

Relationship Between Diversity of Aquatic Plant Communities and Water Environmental Factors in Lhalu Wetland

Plant diversity plays an important role in the integrity and stability of wetland ecosystems. Lhalu Wetland is the highest wetland in the world and is the largest urban natural swamp in China. It plays an important role in ecological balance, increasing air humidity, improving the urban climate, and purifying the water environment in Lhasa. The changes in plant diversity in different areas of the Lhalu Wetland and its relationship with water environmental factors were analyzed via field investigation, field monitoring, and indoor analysis. Results showed that 18 species of aquatic plants were found in the Lhalu Wetland. The Margalef species richness index was in the order M (Middle west) > W (West) > E (East) > N (North) > S (South). Index of species richness ranked of W (11), M (11) > N (8) > E (7) > S (6). Index of ShannonWiener followed that of M (1.9) > W (1.89) > S (1.63) > E (1.26) > N(1.18). Index of Simpson ranked of N (0.44) > E (0.34) > M (0.24) > S (0.21) > W (0.18). The order of Pielou index was that of S (0.91) > M(0.79) > W(0.78) > E(0.65) > N(0.56). Redundancy analysis showed that the diversity of aquatic plants in the Lhalu Wetland was affected by dissolved oxygen, pH, water temperature, total nitrogen, and turbidity. The dominant species in the Lhalu Wetland are CeratopHyllum demersum L., Hippuris vulgaris, Polygonum hydropiper, Softstem bulrush, Acorus calamus, and Juncus effusus, which show a trend of non-pollution-resistant species succession to pollution-resistant species.

Microbial biocides - Viable alternatives to chemicals for tea disease management

Tea plantations in North east India are mostly rain fed and the cropping season needs moist climate with alternating wet and dry periods that eventually attracts diverse tea pathogens like Fusarium solani, Cephaleuros spp., Corticium spp. Poria hypobrunnea, Ustulina zonata, Fomes lamaoensis etc., known to cause several serious diseases in tea and thereby make enormous losses to crop yield and quality, influencing world tea market, adversely. Tea disease management using chemical fungicides alone is, however, prohibitive since the latter is known for destabilizing soil fertility and thereby directly affects the native microbial populations present in soil. Application of new fungicide molecules at its low doses along with exploitation of biological substances (more especially, microbial biocontrol agents) and adoption of Integrated Disease Management (IDM) schedule has been practiced in the present investigation for controlling certain devastating diseases in tea plantation of North East India. Multilocational field trials has been made throughout the investigations using locally isolated microorganisms such as Azotobacter, Azospirillum, Bacillus, Pseudomonas, Streptomyces, Trichoderma etc. (@ 2%, 5% and 10% spore concentrations), along with crude extracts of botanicals (@ 5% concentration) prepared from Amphineuron opulentum, Cleome gynandra, Ipomea convolvulus, Polygonum hydropiper etc. against dominant tea diseases such as black rot, red rust and Fusarium die back respectively. Maximum emphasis has been made to reduce the load of chemicals and move towards alternative strategies of tea disease management as to promote sustainable tea cultivation. Biological control measures (especially microbial) have potential to reduce the disease severity (up to 78.2% disease reduction) and thereby brought impending perspective for the use of effective biopesticides in tea ecosystem. The potential microbial strains were identified using morphological, biochemical as well as molecular characterization and deposited at NCBI GenBank database with accession numbers. The application technology of microbial biocides has also being popularized among the tea growers throughout the region to accelerate the use of these beneficial microorganisms in tea.

Specificity of potential contamination of rice checks with weed seeds

Goal. To analyze the potential level of contamination of arable soil layer weed seeds and to establish the specificity of the changes in such reserves during the vegetation period of crops. The study was performed on rice checks of the Institute of rice of NAAS in the Kherson region in the 2017—2019 biennium.
 Methods. Research field, small and laboratory. To determine the factor of seeds and vegetative reproductive organs of weeds in certain soil horizons of rice fields per unit area (pieces/m2) was selected soil samples by the method of A. N. Kiseleva — twice per season, in spring and after harvest of rice. The arable soil was divided into three layers (10 cm each). To determine the viability of seeds used method of staining their tetrazoles. The results were compiled and analyzed.
 Results. A comparison of the level of potential contamination between horizons showed the highest number of weed seeds in the horizon of 0—10 cm on average, 16041 pieces/ m2, which is 47.6% of the overall presence of weeds in the soil (33650,2 pieces/ m2). In the soil horizon 10—20 cm the number of weed seeds reached 10489.2 pieces/m2, or 31.2% of the debris of the upper horizon. In the lower horizon of 20—30 cm level of the presence of weed seeds was low — 7119.8 pieces/ m2, which amounts to 21.2% from that of the top horizon of the soil. Among the weed species whose seeds were present in soil samples of the top horizon of 0—10 cm, the largest part was Kuga Astrakhantseva Scirpus mucronatus L. — 59.8%, in another place Boule seeds Kuga razveseloj Scirpus supinus L. — 31.8%, Polygonum Persicaria hydropiper L. percetage — 1004.7 pieces/ m2 (6,3%), chicken millet Echinochloa crus galli L. — 329.1 pieces/m2 (2.1%). Other types were less in the stocks of weed seeds.
 Conclusions. During the vegetation period inventory quantities of seeds of change and by autumn are increasing. The largest amplitude value of the stock of weed seeds is manifested in the upper 0—10 cm horizon of the arable layer and reaches to 12.3%. Qualitative and timely implementation of measures to protect rice crops from sowing to the presence of weeds provides a gradual reduction in the volumes of their Bank of seeds in the soil.

Characteristics of endophytic bacteria from Polygonum hydropiper and their use in enhancing P-phytoextraction

Endophytes are significant for their ecological role in plants and potential applications in phytoremediation. Endophytic bacteria with plant-growth-promoting (PGP) characteristics are isolated as inoculants to enhance phytoremediation efficiency; however, few attempts have been made to isolate bacteria from phosphorus (P)-accumulating plants and study their roles in P-phytoextraction. Endophytic bacteria of P-accumulating herb Polygonum hydropiper were isolated and identified. The PGP traits including indole-3-acetic acid (IAA), siderophores, phosphate-solubilization etc. were characterized. Some endophytes were selected as the inoculants for a pot experiment in high P soil to investigate their role in P-phytoextraction. Thirty-five isolates were tolerant of high P and classified into 10 taxonomic groups. The production of indole-3-acetic acid into IAA acid and siderophores was dependent on strain species. Tricalcium phosphate (TCP)-solubilizing activity of these strains was associated with a decrease of pH but increases of organic acids production, while phytin-solubilizing activity was associated with a decrease of pH but increases of acid and alkaline phosphatase activities. In the six inoculants, five strains promoted stem and leaf growth of Polygonum hydropiper except for SLs08. P. hydropiper with inoculation of SLr02, SLr15, SLs13 and SLs18 showed significantly higher root length and surface area than the control plants. The inoculation with SLr15, SLs13 and SLs18 significantly enhanced stem and leaf P accumulation of P. hydropiper. Endophytic bacteria with PGP traits exist in Polygonum hydropiper and strains SLr15, SLs13 and SLs18 greatly promoted plant growth and shoot P accumulation, offering the most potential as PGP inoculants for assisting P. hydropiper in P-phytoextraction.

Research progress of pharmacological activities of Polygonum hydropiper

The Polygonum hydropiper are dried whole grasses of Polygonum hydropiper L., which mainly contains the following chemical components, such asflavonoids, sesquiterpenoids, and volatile oils. The recent research of the pharmacological effects of Polygonum hydropiper showed that its effects include anti-oxidation, anti-inflammation, analgesic. Key words: Polygonum hydropiper; Pharmacologic actions; Polygonaceae; Review

Bioaugmentation-assisted phytoremediation of manganese and cadmium co-contaminated soil by Polygonaceae plants (Polygonum hydropiper L. and Polygonum lapathifolium L.) and Enterobacter sp. FM-1

Polygonum hydropiper L. and Polygonum lapathifolium L. are two of the well-known indigenous Mn-hyperaccumulators. Enterobacter sp. FM-1 is a plant growth-promoting bacterium (PGPB) that we found in our previous study. We intended to develop a novel strategy to improve Mn and Cd co-contaminated soil phytoremediation by using a Mn and Cd-resistant bacterium for soil bioaugmentation. We carried out this study to investigate the effects of different Enterobacter sp. FM-1 inoculation concentrations (0, 5.0 × 105, 1.0 × 106 and 1.4 × 106 CFU g−1 soil) on the phytoremediation of Mn and Cd by Polygonum hydropiper L. and Polygonum lapathifolium L. in two types of Mn-Cd co-contaminated soil. In both soils, inoculation with Enterobacter sp. FM-1 promoted the growth of both plants. Moreover, inoculation with Enterobacter sp. FM-1 (≥1.0 × 106 CFU g−1 soil) significantly increased soil Mn and Cd bioavailability and decreased the soil pH. Therefore, inoculation with Enterobacter sp. FM-1 (1.4 × 106 CFU g−1 soil) improved Mn and Cd accumulation in both plants. Polygonum hydropiper L. presented excellent Mn accumulation in both soils. Additionally, both plants exhibited strong translocation and excellent phytoextraction and bioaccumulation abilities for Mn and Cd. Our findings indicated that Enterobacter sp. FM-1 is a potent bioaugmentation agent that facilitates Mn and Cd phytoextraction in Polygonum hydropiper L. and Polygonum lapathifolium L.

Insecticidal effects of two medicinal plants Polygonum hydropiper L. and Abrus precatorius L. leaves against the rice weevil Sitophilus oryzae L. (Coleoptera: Curculionidae)

During the study, the leaves of two medicinal plants, Polygonum hydropiper and Abrus precatorius were extracted with water, ethanol, methanol and petroleum ether solvents and tested against the rice weevil S. oryzae L. for insecticidal properties. Response varied with plant species. The mortality of adults increased with increasing dose concentrations from 1000 ppm to 5000 ppm each solution, with an exposure time of 72 hours. LC50 values calculated were found to be 15091.436 ppm with water, 5051.534 ppm with ethanol, 5111.063 ppm with methanol and 4305.348 ppm with petroleum ether extracts of P. hydropiper and 9687.292 ppm with water, 6263.849 ppm with ethanol, 4682.683 ppm with methanol and 3222.984 ppm with petroleum ether extracts of Abrus precatorius leaves corresponding their concentrations of the leaf extract solutions at 1000ppm, 2000 ppm, 3000 ppm, 4000 ppm and 5000 ppm respectively. The results of the study showed that methanol and petroleum ether extrcts of P. hydropiper and ethanol, methanol and petroleum ether extracts of A. precatorius showed good toxicity. It appeared that the leaf extracts had some insecticidal activities against S. oryzae adult.
 J. Biodivers. Conserv. Bioresour. Manag. 2019, 5(2): 107-114

Characteristics of bacterial community in root-associated soils of the mining ecotype of Polygonum hydropiper, a P-accumulating herb

Polygonum hydropiper is a phosphorus (P)-accumulating herb used for P-phytoextraction, with higher P-accumulating capability in the mining ecotype (ME) than the non-mining ecotype (NME). This difference might result from the variation in root-associated soil (rhizoplane, rhizosphere) bacterial characteristics. Thus, characteristics and influence factors of bacterial community were investigated in root-associated soils and bulk soils of both ecotypes of P. hydropiper in situ using high-throughput sequencing technique. Bacterial community diversity and richness were independent with ecotypes; rather it positively correlated with soil organic matter concentration. Forty-nine phyla were identified, with Proteobacteria being the most dominated phylum. Soil bacterial community compositions were primarily separated into clusters by ecotypes, simultaneously with great influence by soil groups and chemical properties. Rhizoplane and rhizosphere bacterial communities showed more similarity compared with those in bulk soil. Soil pH, available P, available nitrogen and available potassium played major roles in shaping the bacterial community compositions. The genera Halomonas, Flavisolibacter, Blastocatella, Thiobacillus, Sphingomonas and Bacillus in ME root-associated soils showed higher abundance than in NME root-associated soils, positively with soil available P concentration, suggesting these genera might be important in mobilizing soil mineral-P and facilitating P uptake for the ME of P. hydropiper.

Studi Pengetahuan Masyarakat Mengenai Gulma Air Sebagai Bioindikator Pencemaran Air Di Desa Lambur Luar Kabupaten Tanjung Jabung Timur

The number of aquatic plants along the river flow outside the village of Lambur becomes a barrier to water traffic so that these plants are classified to be weeds or a nuisance for local people. This study aims to determine and document the types of weeds found in the village of Lambur and explore locals’ knowledge about the types of existing water weeds and their use. This research was conducted in the Village of Lambur Luar Tanjung Jabung Timur District by using the roaming method to collect existing Weed samples. Data collection is done by observation, interviews, documentation and literature studies, the data are analysed descriptive qualitative design. The results showed that there were 19 species and 13 families of water weeds, namely: Fimbristylis sp1, fimbristylis sp2, Cyperus sphacelatus Rottb, Blyxa aubertii Rich, Lindernia sp, Glinus oppositifolius (L.) Aug.DC, Melastoma malabathticum L, Nymphaea nouchali Burn, Ludwigia hyssopifolia (G.Don) Exell, Ludwigia repens JR Forst, Scoparia dulcis, Hippochaete debilis (Roxb.ex Vaucher) Ching, Panicum repens L, Oryza sativa, Persicaria hydropiper L, Monochoria vaginalis (Burm.f.) C.Presl, Borreria alata (Aubl.) DC, Borreria repens DC, and Xyris sp. Of the 19 species found, only 12 species, the locals know the name of the water weed, 7 species are only referred to as grass only by the locals, this water weed is not used by the them but mostly weeds are used for animal feed, the researchers provide education to the community that actually weed water can be used for treatment and to find out the quality of a waters or be used as an indicator of the biological condition of a river in wheteher good condition or not.
 
 Keywords: Knowledge Studies, Lambur Luar, Water Weeds

Ethyl acetate fraction of flavonoids from Polygonum hydropiper L. modulates pseudorabies virus-induced inflammation in RAW264.7 cells via the nuclear factor-kappa B and mitogen-activated protein kinase pathways.

Pseudorabies virus (PRV) infection leads to severe inflammatory responses and tissue damage, and many natural herbs exhibit protective effects against viral infection by modulating the inflammatory response. An ethyl acetate fraction of flavonoids from Polygonum hydropiper L. (FEA) was prepared through ethanol extraction and ethyl acetate fractional extraction. An inflammatory model was established in RAW264.7 cells with PRV infection to evaluate the anti-inflammatory activity of FEA by measuring cell viability, nitric oxide (NO) production, reactive oxygen species (ROS) release, and mRNA expression of inflammatory factors, inducible nitric oxide synthase (iNOS), and cyclooxygenase-2 (COX-2). Its functional mechanism was investigated by analyzing the phosphorylation and nuclear translocation of key proteins in the nuclear factor-kappa B (NF-κB) and mitogen-activated protein kinase (MAPK) signaling pathways. Our findings indicate that PRV induced inflammatory responses in RAW264.7 cells, and the responses were similar to that in lipopolysaccharide (LPS)-stimulated cells. FEA significantly suppressed NO synthesis and down-regulated both expression and secretion of COX-2, iNOS, and inflammatory cytokines (P<0.05 or P<0.01). FEA also reduced NF-κB p65 translocation into the nucleus and decreased MAPK phosphorylation, indicating that the NF-κB/MAPK signaling pathway may be closely related to the inflammatory response during viral infection. The findings suggested the potential pharmaceutical application of FEA as a natural product that can treat viral infections due to its ability to mitigate inflammatory responses.

Botanicals for management of sitophilus oryzae (L.) and callosobruchus chinensis (L.)

Bioassay with Ocimum sanctum L. and Polygonum hydropiper L. leaf powders @ 5 g/ kg seeds revealed adult mortality of Sitophilus oryzae (L.) at 70.00% and 96.67%, respectively; with Callosobruchus chinensis (L.) these values were 66.67% and 93.33% at 10 DAT, respectively. The LD50 values of O. sanctum and P hydropiper leaf powders were 0.86 g/ kg and 1.69 g/ kg against S. oryzae and 1.01 g/ kg and 1.32 g/ kg against C. chinensis, respectively.

Effects of waterlogging and increased soil nutrients on growth and reproduction of &lt;i&gt;Polygonum hydropiper&lt;/i&gt; in the hydro-fluctuation belt of the Three Gorges Reservoir Region

Effects of waterlogging and increased soil nutrients on growth and reproduction of &lt;i&gt;Polygonum hydropiper&lt;/i&gt; in the hydro-fluctuation belt of the Three Gorges Reservoir Region

Comparative studies of the amino acids profile Persicaria hydropiper L. delarbre and Persicaria minor hunds., growing in the voronezh region (Russia)

Comparative studies of the amino acids profile Persicaria hydropiper L. delarbre and Persicaria minor hunds., growing in the voronezh region (Russia)

Persicaria hydropiper (L.) Delarbre: A review on traditional uses, bioactive chemical constituents and pharmacological and toxicological activities.

Various plant parts of Persicaria hydropiper (L.) Delarbre (Syn.: Polygonum hydropiper L., Family: Polygonaceae) are used in traditional medicine systems as astringent, sedative, antiseptic and also for the treatment of respiratory disorders, edema and snake bites. It is also used as a spice in many Asian countries. The main aim of this review is to critically analyze the reported traditional uses, bioactive chemical constituents and pharmacological activities of P. hydropiper. Scientific database including PubMed, Scopus, SciFinder and secondary resources including books and proceedings were searched using relevant terminologies related to P. hydropiper and available scientific information was critically analyzed. Analysis of the scientific literature regarding the traditional uses revealed that P. hydropiper is used as a medicine and as spice in food preparations in various parts of the world. Various compounds including flavonoids, phenylpropanoid derivatives, and sesquiterpenoids among others were reported as active compounds. The extracts and compounds from P. hydropiper showed diverse biological activities including anti-inflammatory, antioxidant, cytotoxic, antimicrobial activities, etc. CONCLUSION: Although various research reports showed diverse biological activities for extracts and compounds obtained from P. hydropiper, very few studies were performed using animal models. Many of these studies also lacked proper experimental setting such as use of positive and negative controls and selection of dose as in most of these studies very high doses of extracts were administered. Further, as P. hydropiper is widely used in the treatment of snake bites and insect bites, such effects of extracts and/or compounds are not well explored. Future studies on P. hydropiper should be focused to establish the links between the traditional uses, active compounds and reported pharmacological activities.

Effect of Aqueous Extract of Sorghum Crop Residues on Weed Management and Crop Performance of Wheat

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to evaluate the effect of aqueous extract of sorghum crop residues on weed management and crop performance of wheat. The experiment consisted of three varieties of wheat viz., BARI Gom-19, BARI Gom-21, BARI Gom-24 and five different levels of treatments such as no use of aqueous extract, aqueous extract of sorghum crop residues: 1:20 ratio (w/v), 1:30 ratio (w/v), 1:40 ratio (w/v) and hand weeding. The experiment was laid out in a randomized complete block design with three replications. Seven weed species belonging to five families infested the experimental plots. Weed population, weed dry weight and percent inhibition of weed were significantly influenced by aqueous extract of sorghum crop residues and varieties. The maximum weed growth was noticed with the variety BARI Gom-19 and the minimum was found in the variety BARI Gom-21. The grain yield as well as the other yield contributing characters produced by BARI Gom-21 was the highest among the studied varieties. The highest percent inhibition for all of the weeds was found in hand weeding treatment. The second highest percent weed inhibition was occurred in aqueous extract of sorghum crop residues @ 1:20 ratio (w/v) treatment which was 51.81, 51.10, 52.90, 55.58, 75.27, 73.83 and 53.85 percent for bathua (Chenopodium album), mutha (Cyperus rotundus), durba (Cynodon dactylon), biskatali (Polygonum hydropiper), angta (Paspalum scrobiculatum), tit begun (Solanum torvum) and shama (Echinochloa crusgalli) respectively. The highest loss of grain yield was obtained where no aqueous extract of sorghum crop residues were used. The highest yield and yield attributes were observed where hand weeding is done followed by the application of aqueous extract of sorghum crop residues @1:20 ratio (w/v). Wheat var. BARI Gom-21 with all treatments produced the highest grain and straw yield among the treatment combination. The results of this study indicate that different amount of aqueous extract of sorghum crop residues showed potential activity to suppress weed growth and it has significant effect on the yield of wheat. Therefore, aqueous extract of sorghum crop residues might be used as an alternative way for weed management in effective and sustainable crop production&#x0D; Bangladesh Agron. J. 2018, 21(2): 87-95

A Study on the Latest Research Trends in Natural products with Anti-Aging Effects

In this study, four types of retinol, retinyl palmitate, adenocin, and polytoxylate-dretinamide, which are the ingredients of the Ministry of Food and Drug Safety Notice, included in the study. also we looked at trends in research on Sciadopitys verticillata, Prunella vulgaris, Celosia cristata L., Brazilin, Persicaria hydropiper, Astragalus membranaceus Bunge, Forsythiae Fructus, Lithospermum root, Rheum undulatum L. and Cistanche deserticola Y. C. Ma a natural material that has the efficacy of antioxidant aging. The anti-aging study so far has been found to be centered mainly on collagen production and elastase synthesis inhibition mechanisms. However, given that the aging process of the skin is caused by various ageing processes, it is believed that anti-aging studies using safe and effective natural materials that can help the skin age with various mechanisms should be conducted.

Isolation of Flaccidine, 3-Sitostenone and β-Sitosterol-3-O-β-D-glucopyranoside from Polygonum hydropiper and Evaluation of their Antimicrobial Activities

Isolation of Flaccidine, 3-Sitostenone and β-Sitosterol-3-O-β-D-glucopyranoside from Polygonum hydropiper and Evaluation of their Antimicrobial Activities