Physiological, biochemical and morphoagronomic characterization of drought-tolerant and drought-sensitive bean genotypes under water stress

Abstract

Water deficit is one of the main factors that reduce grain yield. A better understanding of the mechanisms related to this abiotic stress is a key aspect to design and act upon drought tolerance improvement in crop plants. Therefore, the major objective of this study was to investigate four common bean genotypes for drought tolerance and to establish their tolerance mechanisms. The experiment was carried out in a greenhouse, using the completely randomized design in a factorial arrangement (2 9 4), composed by 2 water conditions (well-watered and water deficit) and 4 cultivars, with six replicates per treatment. The four cultivars, two drought-sensitive (IAC Tybatã and BRS Pontal) and two drought-tolerant (IAPAR 81 and BAT 477), were evaluated for some physiological, biochemical and morphoagronomic traits. Drought promoted physiological and metabolic changes in the plants, reflecting on the morphoagronomic traits. Under water deficit, the genotype IAPAR 81 stood out from the others in terms of physiological characters, however, it presented a low efficiency concerning biochemical activities and a significant reduction in the morphoagronomic characters. The cultivar BAT 477 demonstrated to be drought-adapted presenting more efficient biochemical and morphoagronomic adaptions and the genotype BRS Pontal obtained morphoagronomic values similar to BAT 477, thus it may be classified as moderately tolerant to drought.

Effect of water deficit on morphoagronomic traits of black common bean genotypes (Phaseolus vulgaris L.) with contrasting drought tolerance

“…The significant effect of the water deficit x genotype interaction on morphoagronomic traits (NN, PH, NP, and GY) indicated a variation in the performance of the genotypes under control and water‐deficit conditions. This finding is in agreement with the results of Androcioli et al (2020), Mazengo et al (2019), Arruda et al (2018), Porch et al (2009), and Boutraa and Sanders (2001), who also reported a variation in the responses of common bean genotypes to different water regimes.…”

“…Plant species behave differently in water deficit conditions. Common beans are a crop sensitive to drought stress (Arruda et al, 2018; Singh, 1995) because their plants have a C3 metabolism, characterized by their limited photosynthetic ability and low efficiency in water absorption (Fancelli et al, 2015). The magnitude of the damages caused by drought stress depends on the severity, the crop development stage and genotypes' tolerance.…”

Biostimulants Application Alleviates Water Stress Effects on Yield and Chemical Composition of Greenhouse Green Bean (Phaseolus vulgaris L.)

“…Common bean (Phaseolus vulgaris L.) is a drought-sensitive vegetable crop, and water stress may have a detrimental effect on crop yield [21] and the chemical composition of pods and seeds [22,23]. So far, there is limited literature regarding the use of biostimulants on common bean plants, whereas various studies have tested the effects of biostimulants on other legume species, especially under drought stress conditions.…”

Identification of a QTL region for ashy stem blight resistance using genome-wide association and linage analysis in common bean recombinant inbred lines derived from BAT 477 and NY6020-4

“…BAT 477 is a common breeding line with indeterminate prostrate growth habit type III ( Singh, 1982 ). This genotype was reported to be tolerant to drought stress ( Arruda et al., 2018 ), and it has been widely used as a source of resistance to ASB. However, low to high levels of resistance were reported in previous studies in the greenhouse and field ( Mayek-Pérez et al., 2009 ; Viteri and Linares, 2017 ; Viteri and Linares, 2022a ; Viteri et al., 2019 ).…”