Drought tolerance evaluated in common bean genotypes

Abstract

Given the impact of climate issues and their direct influence on agricultural production, the aim of this study was to identify superior genotypes of dry edible common bean under water deficit. Thus, 30 common bean genotypes were evaluated under controlled greenhouse conditions in a randomized block experimental design with split plots and four replications; the plots consisted of the water treatments (irrigated and water deficit) and the split plots consisted of the genotypes. The results showed genetic variability among the accessions evaluated, and in spite of significant reduction in grain yield and stomatal conductance under water deficit, these two traits showed significant, positive correlation and are able to be applied in early selection of genotypes under this stress condition. Another important response was in relation to the genotypes SER-16, SEN 92, FT Paulistinha, Carioca Precoce, IAC Imperador, and SXB 410, which showed the best yield performances in the two water treatments applied. They can be widely used in breeding programs for development of new cultivars, especially aiming at drought tolerance.

Water deficit on the physiological, morphoagronomic, and technological traits of carioca common bean genotypes

“…The G × WT interaction (p ≤ 0.05) had a significant effect on the traits NPP, NEL, SY, and CT, indicating that some genotypes showed differential performance according to the water treatment. Variation in CVs obtained from 4.6 % for NDM to 36.9 % for PH are in accordance to reports in the literature on the response to water deficit in common bean (Gonçalves et al, 2015;Gonçalves et al, 2019;Ribeiro et al, 2019a;Arruda et al, 2019;Sánchez-Reinoso et al, 2020). In this study, the stress intensity index was 45.4 %, which led to a significant reduction in RWC, LA, PH, TDM, NSP, NPP, SY, and NDM compared to the irrigated treatment.…”

“…The treatments were irrigated twice a day for 1 min, distributing 140 mL of water per pot each time through feeder lines and a spaghetti tube for each pot. The matric potential of the soil was kept at around -30 centibar / kPa, monitored daily by moisture sensors set up randomly in the pots (Gonçalves et al, 2019).…”

“…To avoid permanent wilting, irrigation was resumed for two days and, immediately after, two more of the same water deficit cycles were applied. In the third water deficit cycle, physiological and morphological evaluations were performed and then irrigation was reestablished until the end of the crop cycle (Gonçalves et al, 2019).…”

Genome-Wide Association Study Reveals Genomic Regions Associated with Fusarium Wilt Resistance in Common Bean

“…Likewise, some accessions previously characterized as tolerant to water deficit had good performance in resistance to both strains of Fop , especially the genotypes BAT-477 [ 73 ], SEA-5 [ 74 ], SER-16, and IAC Imperador [ 75 ], with average scores of 1.33, 1.33, 2.65, and 2.0, respectively. BRS Estilo and A211 showed susceptibility to UFV01 through the root-dip inoculation method, with susceptibility levels like those previously reported [ 19 , 55 ].…”

Waterlogging effects upon the phenological phases of common bean cultivar BRSMG-Uai

“…Lately, the culture has become more visible among the great grain farmers of the country that make use of advanced technology such as phytosanitary control, mechanical harvest and irrigation. However, the production is still unstable due to various factors, including environmental stresses (Carbonell et al, 2014;Gonçalves et al, 2019). The characterization of different varieties becomes important to identify materials less susceptible to stressful conditions, which is critical to food security.…”