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

• Published in: Physiology and molecular biology of plants Vol. 24; no. 6; pp. 1059 - 1067
• Main Authors: Arruda, Isabella Mendonça, Moda-Cirino, Vânia, Koltun, Alessandra, dos Santos, Odair José Andrade Pais, Moreira, Renata Stolf, Moreira, Aline Fabiana Paladini, Gonçalves, Leandro Simões Azeredo
• Format: Journal Article
• Language: English
• Published: New Delhi Springer India 01-11-2018; Springer Nature B.V
• Subjects: Biochemistry; Biological and Medical Physics; Biomedical and Life Sciences; Biophysics; Cell Biology; Crop yield; Cultivars; Drought; Drought resistance; Genotypes; Grain; Life Sciences; Physiology; Plant growth; Plant Physiology; Plant Sciences; Research Article; Water deficit; Water stress; Plant breeding; L; Drought tolerance; Abiotic stress; Phaseolus vulgaris L
• ISSN: 0971-5894; 0974-0430
• DOI: 10.1007/s12298-018-0555-y

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 × 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.