Performance of soybeans inoculated with multifunctional microorganisms under water-deficit stress

Michel Aldrighi, Juliana Domingues Lima, Paulo Ivan Fernandes-Júnior, Enderson Petrônio de Brito Ferreira
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Abstract

Soybeans (Glycine max (L.) Merr.) are mainly grown in Brazil during the rainy season. However, there are typically periods of rainfall deficiency, which causes water-deficit stress to the crop. Plant growth-promoting rhizobacteria (PGPR) can help alleviate these stresses by inducing water deficit tolerance. The objective of this study was to evaluate the role of PGPR in enhancing soybean tolerance to water-deficit stress. Six PGPR isolates, two for induction of water-deficit tolerance (ESA 441, BRM 034008), two AIA-producing (Ab-V5, BRM 063574), and two phosphate solubilizing (BRM 063573, BRM 67205), and their combination were evaluated, for a total of 16 treatments. The experiment was conducted in a greenhouse using a randomized block design with three replicates. Effects were measured on gas exchange parameters (stomatal conductance, transpiration, internal CO2 concentration, and photosynthetic rate), growth parameters (shoot dry weight, root dry weight, root length, root surface area, root diameter, and root volume), and yield components (pod weight, number of pods, number of grains, and grain weight). Co-inoculation significantly reduces the effects of water stress on gas exchange, plant growth, and productivity compared to single inoculation. Notable combinations, such as BRM 063574 + BRM 67205 + BRM 034008 and BRM 063574 + BRM 063573 + ESA 441, improved root and shoot growth under stress conditions. Yield components also improved with co-inoculations, with combinations such as BRM 063574 + BRM 67205 + ESA 441 showing the highest efficacy. These results suggest that specific PGPR co-inoculations can improve soybean resilience to water deficit stress and promote better growth and yield.

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亏水胁迫下接种多功能微生物对大豆生产性能的影响
大豆(甘氨酸max (L.)))主要在巴西雨季种植。然而,通常会有降雨不足的时期,这对作物造成缺水压力。促进植物生长的根细菌(PGPR)可以通过诱导水分亏缺耐受性来帮助缓解这些胁迫。本研究的目的是评估PGPR在提高大豆对水分亏缺胁迫的耐受性中的作用。6株PGPR菌株,2株诱导水亏耐受性(ESA 441, BRM 034008), 2株产生aia (Ab-V5, BRM 063574), 2株增磷酸盐(BRM 063573, BRM 67205),以及它们的组合,共16个处理进行了评估。试验在温室内进行,采用随机区组设计,设3个重复。测定了气体交换参数(气孔导度、蒸腾、内部CO2浓度和光合速率)、生长参数(茎干重、根干重、根长、根表面积、根直径和根体积)和产量成分(荚果重、荚果数、粒数和粒重)的影响。与单次接种相比,共接种显著降低了水分胁迫对气体交换、植物生长和生产力的影响。在胁迫条件下,BRM 063574 + BRM 67205 + BRM 034008和BRM 063574 + BRM 063573 + ESA 441等显著组合改善了根和梢的生长。共接种后产量各组成部分也有提高,其中BRM 063574 + BRM 67205 + ESA 441的组合效果最好。这些结果表明,特异的PGPR共接种可以提高大豆对水分亏缺胁迫的适应能力,促进大豆的生长和产量。
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