| Congresso Brasileiro de Microbiologia 2023 | Resumo: 599-1 | ||||
Resumo:The common bean is grown in Brazil in three seasons: the “water”, the “dry” and the “winter” seasons. The first and second cropping seasons are usually conducted without irrigation, which poses drought stress for the crop due to irregular rainfall distribution, decreasing crop productivity. The objective of this work was to determine the effect of multifunctional microorganisms’ inoculation on the development, physiology, and grain yield of common bean, cultivated under drought stress conditions. Two rhizobium isolates (BaDeG4R2 and TaMsG2R1), two drought-tolerance inducing isolates (M163 and ESA15), two AIA-producing isolates (Ab-V5 and BRM 063574), and two phosphate solubilizing isolates (BRM 063573, TilvG4R5), as well as their combinations, were evaluated. The experiment was carried out in a randomized block design with four repetitions. A total of 26 treatments (8 microorganisms, their combinations, and 2 controls) were subjected to drought stress. The growth variables (shoot dry mass - SDM, root length - RL, root surface area - RSA, root diameter - RD, and root volume - RV), parameters related to gas exchange (internal CO2 - Ci, transpiration - E, stomatal conductance - gs and photosynthetic rate - A) and grain yield components (pod mass - PM, pod number - PN, the number of grains - NG and grain mass - GG) were determined. The treatments BaDeG4R2+BRM 063574+TilvG4R5+M163, BaDeG4R2+BRM 063574+BRM 063573+M163, BaDeG4R2+BRM 063574+BRM 063573+ESA15, BaDeG4R2+Ab-V5+BRM 063573+M163, TaMsG2R1+BRM 063574+TilvG4R5+ESA15, TaMsG2R1+BRM 063574+BRM 063573+ESA15, TaMsG2R1+Ab-V5+TilvG4R5+M163, TaMsG2R1+Ab-V5+BRM 063573+M163, TaMsG2R1+Ab-V5+BRM 063573+ESA15 and Ab-V5, showed the best results for the growth of roots and shoots of the common bean. The parameters related to gas exchange were benefited by the treatments BaDeG4R2+Ab-V5+BRM 063573+ESA15, TaMsG2R1+BRM 063574+BRM 063573+ESA15, and M163. On the other hand, the common bean yield components were benefited by the treatments BaDeG4R2+BRM 063574+TilvG4R5+ESA15, BaDeG4R2+BRM 063574+BRM 063573+M163, BaDeG4R2+BRM 063574+BRM 063573+ESA15, BaDeG4R2+Ab-V5+BRM 063573+M163+Ms +BRM 063573+ESA15, TaMsG2R1+Ab-V5+TilvG4R5+M163, BRM 063574, Ab-V5, BRM 063573 and Absolute control. Considering the effects of inoculations on growth parameters, gas exchange, and grain production, the co-inoculation treatments containing the isolates BaDeG4R2, BRM 063574, BRM 063573, and M163 provided greater tolerance of the common bean to drought stress, resulting in better growth rates, gas exchange, and grain production Palavras-chave: Coinoculation, Drought tolerance, IRGA Agência de fomento:CNPq | |||||