Number Of Internodes Research Articles

Efficient dose of Bacillus subtilis UFMT-Pant001 as a plant growth promoter in soybean under greenhouse conditions

The potential for increasing soybean productivity and reducing diseases has become evident for Bacillus spp. The objective of this study was to evaluate the efficiency of B. subtilis strain UFMT-Pant001 as a plant growth promoter in soybean under greenhouse conditions. Four independent experiments were conducted in a greenhouse using a B. subtilis UFMT-Pant001 liquid inoculant at 1x109 CFU mL-1. The results showed significant increases in biomass, nodulation, nutrients in the shoot, number of internodes, and root length in soybean cultivars inoculated with B. subtilis UFMT-Pant001 in greenhouse experiments. Positive effects on soybean biomass and other evaluated characteristics were observed with different doses of B. subtilis UFMT-Pant001, with the best results observed when doses of 200 to 300 mL were used for 50 kg of seeds. The use of B. subtilis UFMT-Pant001 did not interfere with soybean nodulation and contributed to an increase in nodule number and weight.

Different Concentrations of Chemical Topping Agents Affect Cotton Yield and Quality by Regulating Plant Architecture

Manual removal of the main stem tips of cotton (Gossypium hirsutum L.) is a traditional topping approach in China. However, chemical topping has become an inevitable trend. Therefore, it is of great significance to study the effect and appropriate concentration of agents for advancement of cotton whole process mechanization management technology. A two-year field experiment was conducted to evaluate the effects of different methods of topping on cotton yield and plant architecture in Shihezi, Xinjiang, China. Plant topping included manual topping, non-topping as the control, and chemical topping (high, medium, and low concentrations of topping agent) to determine a suitable topping method and topping agent concentration for machine-picked cotton. Chemical topping was performed using fortified mepiquat chloride (DPC+). Chemical topping and manual topping increased seed cotton yield compared with non-topping. Compared with non-topping, high, medium, and low concentrations of topping agent significantly increased the yield by 19.5–27.9%, 24.1–29.4%, and 24.3–28.4%, respectively. Topping treatment mainly regulated yield and total boll number per unit area by affecting the boll number per plant and had a certain positive effect on fiber strength but no significant effect on boll weight. Chemical topping affected both vertical and horizontal plant architecture characteristics of cotton; the plant height of low-, medium-, and high-concentration treatments increased by 7.2–11.4 cm, 4.0–5.7 cm, and 2.3–4.4 cm, respectively, compared with manual topping and decreased by 5.1–7.8 cm, 8.3–13.5 cm, and 9.4–16.9 cm, respectively, compared with non-topping. The number of main stem internodes was significantly different between high- and low-concentration treatments, which showed that the higher the concentration, the lower the number of the main stem internodes. Chemical topping controlled the increase in the length of the upper branches, the higher the concentration, the lower the increase in the length of the upper fruit branch. Compared with non-topping, the medium concentration of topping agent controlled the number of fruit branches, similar to manual topping. The role of upper internode length of cotton cannot be ignored under chemical topping. The peak leaf area index (LAI) of medium- and high-concentration treatments was delayed for 1 week in the late growth period (after topping for 28 d) compared with manual topping. The LAI values were high, and the duration of high values was prolonged. The optimal chemical topping agent was the medium concentration.

Analysis of Phenotypic and Physiological Characteristics of Plant Height Difference in Alfalfa

Cultivating new alfalfa (Medicago sativa L.) varieties with high yield and quality is of great significance for improving alfalfa yield and promoting the development of the grass and livestock industry. Plant height is an important indicator of alfalfa yield and is closely related to photosynthetic capacity, harvest index and yield. However, the underlying cause of the variation in height among alfalfa plants is not clear. In this paper, we measured the phenotypic traits, photosynthetic physiology and endogenous hormone content of tall- and short-stalked alfalfa materials and analyzed the important external and internal factors that caused the difference in plant height of alfalfa. We found that the phenotypic traits of tall- and short-stalked alfalfa materials showed significant differences, and dwarf alfalfa showed significant shortening of the main stem internode length. There were also some differences in light and physiological indicators and endogenous hormone contents between tall- and short-stalked alfalfa materials. Through correlation analysis, we found that the phenotypic traits and physiological indicators significantly correlated with alfalfa plant height were the number of internodes, stem diameter, average internode length, leaf–stem ratio, leaf area, Pn (net photosynthetic rate), Tr (transpiration rate), upper leaf SP (soluble protein), Suc (sucrose) content, middle stem Sta (starch) content, middle stem ZT (zeatin) and IAA (indole-3-acetic acid). Further analysis showed that Tr, IAA and LA played a direct role in plant height, with Tr contributing the most to plant height, followed by IAA. Finally, we found that the starch content of the middle stem had a significant impact on plant height through principal component analysis. These results provide new insights into the formation and genetic improvement of plant height traits in leguminous forages such as alfalfa.

Comparison of two contrasting Leymus chinensis accessions reveals the roles of the cell wall and auxin in rhizome development

Leymus chinensis, a perennial native forage grass, is widely distributed in the steppes of Inner Mongolia as the dominant species. The main reproductive strategy of this grass is clonal propagation, which occurs via the proliferation of subterranean horizontal stems known as rhizomes. To elucidate the mechanism underlying rhizome development in this grass, we collected 60 accessions of L. chinensis and evaluated their rhizome development. One accession, which we named SR-74 (Strong Rhizomes), had significantly better rhizome development capacity than the accession WR-16 (Weak Rhizomes) in terms of rhizome number, total and primary rhizome length, and number of rhizome seedlings. Rhizome elongation was positively correlated with the number of internodes in the rhizome, which affected plant biomass. Compared to WR-16, SR-74 had higher rhizome tip hardness, higher abundance of transcripts participating in the biosynthesis of cell wall components, and higher levels of the metabolites L-phenylalanine, trans-cinnamic acid, 3-coumaric acid, ferulic acid, and coniferin. These metabolites in the phenylpropanoid biosynthesis pathway are precursors of lignin. In addition, SR-74 rhizomes contained higher amounts of auxin and auxin metabolites, including L-Trp, IPA, IBA, IAA and IAA-Asp, as well as upregulated expression of the auxin biosynthesis and signaling genes YUCCA6, YUCCA8, YUCCA10, YUCCA11, PIN1, PIN2, UGT1, UGT2, UGT4, UGT10, GH3, IAA7, IAA23, and IAA30. We propose a network between auxin signaling and the cell wall underlying rhizome development in L. chinensis.

Analysis of Heterosis and Heterobeltiosis for Earliness, Yield and Its Contributing Traits in Okra (Abelmoschus esculentus L. Moench)

Thirty-six F1 hybrids were generated from nine lines and four testers through line x tester mating design, these F1’s along with 13 parents and 1 commercial check (Punjab-8) were evaluated to study the magnitude and direction of heterosis for growth and earliness over various characters in okra. Heterosis was studied to compare traits such as days to 50% flowering, days to picking, plant height, number of internodes, number of branches per plant, fruit length at commercial maturity and final maturity, number of fruits per plant, number of seeds per fruit, 100 seed weight, fruit weight, and yield per plant. Significant heterosis was found over better parent (Heterobeltiosis), mid parent and commercial checks for all the traits studied in desirable direction. The present study showed that the crosses L3 x T2 (19.04, 15.41, 8.28), L5 x T2 (41.90, 14.55, 7.47), L8 x T3 (23.75, 6.48, 8.46) recorded significant positive heterosis for yield per plant over mid parent, better parent and over standard check. Same hybrid L3 x T2 exhibited negative and highly significant heterosis for days to 50% flowering and days to first picking (-11.65,-12.00, -8.33) and (-11.79, -12.12, -15.94) respectively that are earliness character over mid parent, better parent and standard check. These hybrids may further be tested over various locations before release for commercial cultivation. High estimates of heterosis obtained in hybrid combinations revealed considerable genetic divergence among the parental lines and reveals good scope for commercial exploitation of heterosis in okra.

Efficacy of phytohormones producing isolates on the growth of two stem-cutting robusta coffee (Coffea canephora)

The propagation techniques of robusta coffee by cutting can be accelerated by the application of plant growth-promoting hormones. This study is to determine the efficacy of phytohormone-producing isolates on the growth of two-segment cutting of Robusta coffee. The study was conducted using a non-factorial completely randomized design with 2 replications. The treatments consist of control, synthetic IBA (Rooton-f) with three dilution concentrations, 4 isolates (Rhodococcus qingshengii, Burkholderia ambifaria, and Bacillus wiedmannii; fungi Aspergillus niger) with three dilution concentrations. Observed parameters included a percentage of live cuttings, percentage of cuttings sprouted, percentage of rooted cuttings, plant height, number of shoots, number of internodes, number of leaves, number of primary roots, primary root length, and primary root diameter. The results showed that the B. wiedmannii treatment had the best performance compared to other treatments because this isolate produced the highest number of primary roots (4.60) and primary root diameters (2.97 mm) compared to other treatments including control and Rooton-f. This is related to its ability to produce phytohormones that can stimulate the root growth of coffee robusta cuttings.

Determination of the limiting factors for sugarcane (Saccharum officinarum L.) productivity with Leaf Sampling Unit (LSU) method in sandy soil

Sugarcane is one of the important plantation commodities that is widely cultivated in Indonesia as a raw material for the sugar industry. One type of land that is commonly used for sugarcane cultivation is sandy soil, however, this soil has shortcomings due to nutrients availability which affects the productivity of sugarcane. This study aims to determine the limiting factor of sugarcane productivity in sandy soil through the Leaf Sampling Unit (LSU) analysis. Foliar nutrient levels of Nitrogen (N), Phosphorus (P), Potassium (K), Calcium (Ca), and Magnesium (Mg) were determined. The parameters of plant growth observed included stalk height, stalk diameter, number of internodes per stalk, number of green leaves, number of stalk per clump, stalk fresh weight, and sugarcane productivity. Data were analyzed using correlation and descriptive tests. LSU analysis indicated that the levels of N and Ca were under sufficient conditions, at 1.98% and 0.33%, respectively. Meanwhile, the P, K, and Mg were in critical condition, with values of 0.03%, 0.09%, and 0.12%, respectively. Sugarcane stem diameter had a correlation with sugarcane productivity (r=0.985). Increasing the dose of fertilizers, especially P, K, and Mg is needed to overcome these nutrient deficiency conditions; thus the productivity of sugarcane can be optimized and sustainable.

Cytokinin-inducible response regulator SlRR6 controls plant height through gibberellin and auxin pathways in tomato.

Plant height is a key agronomic trait regulated by several phytohormones such as gibberellins (GAs) and auxin. However, little is known about how cytokinin (CK) participates in this process. Here, we report that SlRR6, a type-A response regulator in the CK signaling pathway, positively regulates plant height in tomato. SlRR6 was induced by exogenous kinetin and GA3, but inhibited by indole-3-acetic acid (IAA). Knock out of SlRR6 reduced tomato plant height through shortening internode length, while overexpression of SlRR6 caused taller plants due to increased internode number. Cytological observation of longitudinal stems showed that both knock out and overexpression of SlRR6 generated larger cells, but significantly reduced cell numbers in each internode. Further studies demonstrated that overexpression of SlRR6 enhanced GA accumulation and lowered IAA content, along with expression changes in GA- and IAA-related genes. Exogenous paclobutrazol and IAA treatments restored the increased plant height phenotype in SlRR6-overexpressing lines. Yeast two-hybrid, bimolecular fluorescence complementation, and co-immunoprecipitation assays showed that SlRR6 interacts with a small auxin up RNA protein, SlSAUR58. Moreover, SlSAUR58-overexpressing plants were dwarf with decreased internode length. Overall, our findings establish SlRR6 as a vital component in the CK signaling, GA, and IAA regulatory network that controls plant height.

Morphological and Anatomical Analysis of the Internodes of a New Dwarf Variant of Moso Bamboo, Phyllostachys edulis f. exaurita.

The lack of mutants due to the long periods between flowering of bamboo plants is one of the limiting factors inhibiting research progress in the culm development of bamboo plants. In this study, a stable new dwarf variant of Phyllostachys edulis (Moso bamboo), Phyllostachys edulis f. exaurita T. G. Chen, was discovered and was characterized morphologically, anatomically, and physiologically. The height, diameter at breast height, number of internodes, length and wall thickness of internodes, length, width and number of parenchyma cells of internodes, and morphology of the wide-type (WT) and dwarf variant vascular bundles were compared. The height of the variant was only 49% that of the WT Moso bamboo. It was concluded that the decrease in internode number and length was the cause of dwarfism in P. edulis f. exaurita. The decreased internode length was the result of a decrease in cell number and cell length in the internode. In addition, the laws of change of internode length, internode thickness, cell length, and cell number differed between the WT Moso bamboo and the variant. Furthermore, lower IAA and zeatin concentrations were detected in the buds of the variant. These results suggest that P. edulis f. exaurita is a variant with inhibited primary thickening growth, which is valuable for interpretating the molecular mechanisms underlying the primary thickening growth of bamboo that are still largely unknown.

The role of growth regulators in the ontogenesis of plants of potato cancer differentiators in vitro culture

Goal. To study impact of growing regulators on morphometric indexes and potato cultivar-differentiators productivity in culture in vitro.
 Methods. The studies conducted in the Laboratory of Biotechnology for Agricultural Crops of Ukrainian Plant Quarantine Research Station Institute of Plant Protection of NAAS. Murashige-Skoog (MS) nutrient medium was used with the addition of different concentrations of Epin-maxi growth regulators (MS — control; MS + Epin-maxi r., (2,4-epibrassinolide, 0.012 g/l); MS + Epin-maxi, 0.025 g/l) and Poteitin (MS — control; MS + Poteitin w.s., (2,6-dimethylpyridine-1-oxide with succinic acid, 0.15 mg/l); MS + Poteitin, 0.3 mg/l) on different varieties of potato cancer of different ripeness groups (Schedryk — early, Slovyanka — medium-ripe). Plants grew in terms of cultivation room during 16-hour photoperiod a light intensity of 2000—2500 lux, temperature 22—25°C and humidity of 60—80%. The grafting conducted in quantity 25 plants with three times experiment repeating.
 Results. The morphogenesis optimal indexes received during their put into the nutritious medium MS + Epin-maxi 0.025 g/l and MS + Poteytin 0.3 mg/l. The plants’ height of variety Schedryk increased on 21st day of growing on 4.9—25.2 mm, in control (65.2 mm) and internodes number increased 0.4—0.9 pcs in control (5.2 pcs.). The plant’s height increased of variety Slovyanka in variants with stimulators was more than on 12.1—28.4 mm and the internodes number increased 0.5—1.1 pcs. The root-forming increase determined in all experiments variants: roots quantity — on 2.6—3.4 pcs., their length was 25.6—29.8 mm, the average microtubers weight was in 1.4—1.6 times higher, the mictotubers weight increase on 1 plant in 1.6—1.9 times, the quantity of microtubers on one plants in 1.6—1.8 times in comparison with control.
 Conclusions. The optimal indexes of morphometric parameters and potato cultivar-differentiators productivity on culture in vitro received in variants of research with Epin-maxi 0.025 g/l and Poteytin 0.3 mg/l. These stimulators, when added to the nutrient medium, contributed to an increase in plant height, the number of internodes, root formation (number of roots and their length), average mass of microtubers, mass and number of microtubers per plant.

Plasticity in the Morphology of Growing Bamboo: A Bayesian Analysis of Exogenous Treatment Effects on Plant Height, Internode Length, and Internode Numbers.

Sucrose (Suc) and gibberellin (GA) can promote the elongation of certain internodes in bamboo. However, there is a lack of field studies to support these findings and no evidence concerning how Suc and GA promote the plant height of bamboo by regulating the internode elongation and number. We investigated the plant height, the length of each internode, and the total number of internodes of Moso bamboo (Phyllostachys edulis) under exogenous Suc, GA, and control group (CTRL) treatments in the field and analyzed how Suc and GA affected the height of Moso bamboo by promoting the internode length and number. The lengths of the 10th-50th internodes were significantly increased under the exogenous Suc and GA treatments, and the number of internodes was significantly increased by the exogenous Suc treatment. The increased effect of Suc and GA exogenous treatment on the proportion of longer internodes showed a weakening trend near the plant height of 15-16 m compared with the CTRL, suggesting that these exogenous treatments may be more effective in regions where bamboo growth is suboptimal. This study demonstrated that both the exogenous Suc and GA treatments could promote internode elongation of Moso bamboo in the field. The exogenous GA treatment had a stronger effect on internode elongation, and the exogenous Suc treatment had a stronger effect on increasing the internode numbers. The increase in plant height by the exogenous Suc and GA treatments was promoted by the co-elongation of most internodes or the increase in the proportion of longer internodes.

Effect of Coconut Water and Benzyl Adenine with Different Concentrations on Potato Tissue Culture (Solanum tuberosum L.) Var. Granola

This study aimed to determine the effect of giving coconut water and the right concentration of benzyl adenine in MS media for potato tissue culture of Granola variety. The study was carried out from November to January 2022, in the Plant Tissue Culture Laboratory of the Faculty of Agriculture, Pattimura University, Ambon. This study used a 2-factor completely randomized design (CRD); the first factor was the concentration of coconut water 0 with 100 ml/l, and the second factor was the concentration of BA consisting of 0.1,2,3,4 mg/l. The study was conducted with 7 replicates and each replication consisted of 5 explants in each culture bottle, so that there were 350 cultures as the unit of observation. The variables observed in this study included the number of shoots, the number of internodes, the number of branches, and the number of roots per plantlet. The results showed that the concentration of coconut water 0 and 100 ml/l had an effect on the number of internodes and the number of roots at 4 weeks after planting. Benzyl adenine at 0, 1, 2, 3 and 4 mg/l had an effect on the variable number of shoots at 8 WAP and the number of internodes at 2 - 8 WAP; which also applies to the number of roots. Whereas, the interaction between both factors affected the number of internodes at 4, 6, and 8 weeks, which also applies to the number of roots.

Effect of planting media modification on growth and seed potential of two vanilla varieties

The discontinuous availability of good-quality seeds had become the main problem in vanilla development. One of the limiting factors is the retarded growth of tendrils, which are used as plant propagation materials. The growth of vanilla vines using recommended cultivation techniques only produces one internode/month. Therefore it is necessary to modify the cultivation techniques to accelerate vanilla seeds production. Modifying the seed propagation media is one of the possible adjustments. This research aims to analyze the effect of planting media modification on vanilla growth and seed potency. The study used a randomized block design of 2 factors with four replications. The first factor is variety, namely Vania 1 and Vania 2, while the second factor is the type of planting media, namely media 1 (compost: burnt husks: cow manure (1:1:1)), media 2 (soil: compost: burnt husks: cow manure (1:1:1:1) ), media 3 (recommended cultivation (soil: cow manure (1:1)). The parameters observed were plant growth (tendrils length, number of internodes, number of leaves, leaf length, leaf width), cutting potential (seeds) and chlorophyll content. The results showed that the growth of Vania 1 was the same as that of Vania 2 and media composition without soil (media 1) resulted in the highest cutting potential compared to other media.

PENAMPILAN KARAKTER AGRONOMI DAN KOMPONEN HASIL EMPAT VARIETAS SORGUM MANIS (Sorghum bicolor L.) PADA BERBAGAI JARAK TANAM

High productivity of sweet sorghum can be achieved by applying optimal cultivation technology, including the use of high-yielding varieties. Differences in sorghum varieties will refer to genetic factors in each sorghum variety. Increasing sorghum production and land use efficiency, it can be done by adjusting the spacing to obtain the ideal spacing. This study aims to determine and analyze the effect of variety and spacing on the appearance of agronomic characters and yield components of sorghum. This study was arranged based on a two-factor Randomized Block Design (RAK), as the first factor was four varieties of sorghum (V), namely Super 1 (V1), Super 2 (V2), Bioguma 2 Agritan (V3) and Numbu (V3) varieties. V4), the second factor was the spacing (J) with three treatment levels, namely 75 cm × 15 cm (J1), 75 cm × 20 cm (J2), and 75 cm × 25 cm (J3) so that 12 treatment combinations were obtained and repeated as many as 3 times. Each variety consists of 4 rows that are placed randomly. The results showed that the Bioguma 2 Agritan variety produced the appearance of agronomic characters with the highest plant average (293.82 cm), the highest number of leaves (13.59 strands), the highest number of internodes (13.68 books), and yield components in the form of an average the fastest flowering age (63.89 days), the fastest harvest age (103.11 days), the longest panicle (26.94 cm), the heaviest seed weight per panicle (81.58 g), the heaviest 1000 seed weight (31.33 g), highest brix content (18.21%) and highest production (2.24 kg plot-1 or 3.73 ton hectare-1). While the Super 2 variety produced an average stem with the widest diameter (21.80 mm). There is no effect of spacing on agronomic characters and yield components and there is no interaction effect between varieties and spacing on agronomic characters and yield components.

Gas exchanges and morphometric measurements of a variety of hops (Humulus lupulus L.) (Cannabaceae) grown in subtropical conditions under organic and conventional management

Hops are native to the Northern Hemisphere and are widespread throughout the world; in Brazil, crops are grown on a small scale. How management differentiation can affect the physiological development of crops in subtropical climates is not well studied. The objective of this study was to evaluate the physiological and morphometric performance of five hop varieties under organic and conventional management. These experiments were conducted at Lageado Farm, at the campus of São Paulo State University in Botucatu. A 2 x 5 factorial design was adopted, with the main factor being the cultivation system (organic and conventional) and the secondary factor being the hop varieties (Cascade, Columbus, Chinook, Hallertau Mittelfrüeh and Nugget). The cultivation systems differed by fertilization and phytosanitary management. Analyses of gas exchange and chlorophyll a fluorescence were performed during the vegetative development of the plants and during branch elongation. Morphometric analyses of the plants were performed to determine the number of internodes (22.40; 18.20) and the heights of the plants (201.09; 131.07), with organic and conventional treatment, respectively. All the varieties showed satisfactory physiological and morphometric performance; however, plants grown under organic management had better results than those grown under the conventional cropping system. Lastly, we measured the potential efficiency of PSII; Hallertau M. (0.89), Nugget (0.89) and Columbus (0.88) presented the highest measurements, and the lowest values were observed in Cascade (0.86) and Chinook (0.85). In general, Hallertau M. and Columbus had the highest gas exchange values, while Cascade had the lowest.

Sucrose Transporter StSUT2 Affects Potato Plants Growth, Flowering Time, and Tuber Yield.

Sucrose transporters (SUTs) mediate sucrose phloem loading in source tissue and sucrose unloading into sink tissue in potatoes and higher plants, thus playing a crucial role in plant growth and development. In potatoes, the physiological function of the sucrose transporters StSUT1 and StSUT4 has been clarified, whereas the physiological role of StSUT2 is not yet fully understood. This study analyzed the relative expression of StSUT2 compared to that of StSUT1 and StSUT4 in different tissues from potatoes and its impact on different physiological characteristics by using StSUT2-RNA interference lines. Here, we report a negative effect of StSUT2-RNA interference on plant height, fresh weight, internodes number, leaf area, flowering time, and tuber yield. However, our data indicate that StSUT2 is not involved in carbohydrate accumulation in potato leaves and tubers. In addition, the data of the RNA-seq between the StSUT2-RNA interference line and WT showed that 152 genes were differentially expressed, of which 128 genes were upregulated and 24 genes were downregulated, and the GO and KEGG analyses revealed that differentially expressed genes were mainly related to cell wall composition metabolism. Thus, StSUT2 functions in potato plant growth, flowering time, and tuber yield without affecting carbohydrate accumulation in the leaves and tubers but may be involved in cell wall composition metabolism.

Association technological and agronomic traits sugarcane for the quantitative and qualitative production of brown sugar

Despite the growing demand for the consumption of brown sugar, there is little study on sugarcane cultivars and harvesting times more propitious for the production of brown sugar. In this sense, the objective of this study was to identify linear relationships between agronomic and technological variables of different genotypes and harvest times, to identify direct and indirect effects on the quantitative and qualitative production of brown sugar. For this, an experiment was carried out in a split-plot scheme (genotypes × growing seasons), in a randomized block design with four replications. The variables analyzed were stem height, the number of internodes, apparent sucrose in sugarcane, apparent sucrose from broth, soluble solids content of cane, fiber, purity, total recoverable sugars, average stem mass, the volume of broth extracted, content of soluble solids in the broth, frown sugar apparent sucrose, instrumental color, mass of brown sugar per ton of cane and the amount of broth per ton of cane. The statistical analyzes performed were path analysis and canonical correlation. The amount of juice per ton of cane and ºBrix of the juice can be selected for greater brown sugar production, both had a greater direct effect. With different responses in the three harvests, the canonical correlation showed interdependence between groups of variables, inferring those agronomic variables can be used in the selection of better-quality brown sugar cultivars. If the objective is greater sugar production, season 1 proved to be more promising in relation to the others.

Influence of Polyhalite on growth and yield of sugarcane var. Co 11015 in typic Ustropepts

Polyhalite is a natural mineral which contains potassium (K2O, 14%), sulphur (SO3, 48%), calcium (CaO, 17%) and magnesium (MgO, 6%). It is used as fertilizer for high value crops. Soil fertility, selection of fertilizer sources and application practices are all crucial factors in maximizing mineral nutrition during the cropping season. With an increasing demand for fertilizer, polyhalite was identified as a potassium source for crops. In view of this context, a present experimental work was conducted during 2021-22 at farmer’s field, Arachalur, Erode district, Tamil Nadu, India to study the influence of polyhalite on growth attributes, yield attributes and yield of sugarcane var. Co 11015. The experiment was conducted in sandy loam soil laid out in randomized block design with 10 treatments replicated thrice. The recommended dose of nitrogen and phosphorus was applied uniformly to all treatments. The potassium was applied in two sources, muriate of potash (MOP) and polyalite in different ratios and levels except control. The results of the field experiment revealed that sugarcane significantly responded to the application of two potassium sources and levels. The maximum values of growth attributes like plant height, number of leaves per stalk, leaf area index, leaf chlorophyll content, yield attributes and yield like, number of internodes per stalk, length of internode per millable cane, length of millable cane, diameter of millable cane, single cane weight, number of tillers per plant, number of millable cane, cane yield and sugar yield were recorded with application of RDF (NP alone) + 150% K (169.5 kg K2O/ha) as polyhalite (T8). The lowest respond was found in the treatment T1, which received RDF (NP alone).

Defoliation at seedling stage enhances maize yield by reducing lodging

AbstractLodging greatly reduces maize (Zea mays L.) grain yield and harvest efficiency. We conducted a 3‐year (2018–2020) field experiment in Fengcheng city, Liaoning, China to investigate the effects of maize seedling defoliation on lodging resistance and grain yield. Two cultivars, Liangyu99 and Hongshuo, were tested without (control treatment) and with defoliation at seedling stage (V4 stage: DS treatment). Compared with the control, DS significantly (p < 0.05) decreased stalk lodging by 63.2%–77.9% and 51.0%–75.1%, contributing to the increase in grain yield by 4.94%–7.76% and 9.75%–19.6% for Liangyu99 and Hongshuo, respectively, during 2018–2020. The improvement of maize lodging resistance by seeding defoliation was mainly due to changes in plant morphology. On average, 12.0% and 21.9% declines in plant and ear heights, respectively, were observed and the number of internodes below the ear was reduced by 1–2 units for both cultivars with DS. A comparison of cultivars revealed that the increase in grain yield with defoliation was approximately twofold greater for Hongshuo than for Liangyu99. The greatest yield increase due to seedling defoliation was observed in 2018, when the yield was lowest with the nontreated control. However, in environments where lodging is less common, suppression of early vegetative growth would probably make little, if any, contribution to maize yield. These results suggest that defoliation of maize seedlings could be a profitable agronomic practice for maize grown in areas that experience frequent lodging.

English

This study aims at evaluating the agronomic efficiency of the Bacillus subtilis UFMT-Pant001 strain as a plant growth promoter in soybean at three greenhouses from distinct Brazilian regions. The treatments were formulated based on this strain at a concentration of 1x109 UFC.mL-1 in volumes of 100, 150, 200, 250, 300, 350 or 400 mL for each 50 kg of seeds. Bradyrhizobium japonicum was added in all experiments, and the absolute control contained only this bacterium. The positive control employs a commercial product based on Bacillus subtilis. Both inoculums were adjusted at the recommended dose of 100 mL/50 kg of seeds. In the experiments, the soybean cultivars 7110 RR, Desafio RR, TMG-132 and CG 7665 RR were used. A positive influence on the increment in plant height, biomass, number of internodes, nodules, grains, pods, roots, nutrients and shoot dry mass per plant inoculated with UFMT-Pant001 strain was observed. Although the results are promising to the B. subtilis UFMT-Pant001 strain as a potential plant growth promoter for soybean, more tests, including with other cultivars, are needed, especially in the field. Key words: Bacillus subtilis, bacterial-based inoculant, soybean, plant growth-promoting rhizobacteria.