Swivia M. Hamabwe, Nicholas A. Otieno, Judith A. Odhiambo, Travis Parker, Kelvin Kamfwa
{"title":"安第斯蚕豆基因型对终期干旱的农艺学和形态生理学反应","authors":"Swivia M. Hamabwe, Nicholas A. Otieno, Judith A. Odhiambo, Travis Parker, Kelvin Kamfwa","doi":"10.1002/csc2.21362","DOIUrl":null,"url":null,"abstract":"<p>Drought is a major production constraint of common bean (<i>Phaseolus vulgaris</i> L.) worldwide. The objectives of this study were to (i) assess the agronomic and morpho-physiological response of Andean genotypes to terminal drought, and (ii) identify Andean genotypes with an ideal combination of agronomic and morpho-physiological traits for enhanced drought tolerance. Twenty Andean genotypes and seven checks were evaluated for drought tolerance in three field trials conducted in three locations. Agronomic and morpho-physiological traits including seed yield, seed weight, shoot dry weight, pod number, pod harvest index, harvest index, and carbon isotope discrimination (CID) were measured. Strong positive correlations were observed between seed yield, and partitioning efficiency metrics and CID (<i>r</i> = 0.57***) under drought, which suggested the important role of assimilate partitioning and water use efficiency in the observed drought tolerance. The heritability estimates for pod harvest index (<i>H</i><sup>2 </sup>= 0.88) and harvest index (<i>H</i><sup>2 </sup>= 0.87) were higher than for seed yield (<i>H</i><sup>2 </sup>= 0.43) and other morpho-physiological traits, thus they can be used to indirectly select for drought tolerance. Based on the relationship between seed yield and CID under drought stress, 12 genotypes were identified as drought tolerant with high water use efficiency. Among these, three were classified as water savers, while nine as water spenders. Genotypes with an ideal combination of superior shoot dry weight, partition efficiency, water use efficiency, and superior seed yield under both drought stress and non-stress conditions were identified. The identified genotypes can be used for genetic improvement of drought tolerance in the Andean gene pool of common bean.</p>","PeriodicalId":10849,"journal":{"name":"Crop Science","volume":"64 6","pages":"3521-3532"},"PeriodicalIF":2.0000,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Agronomic and morpho-physiological response of Andean genotypes of common bean to terminal drought\",\"authors\":\"Swivia M. Hamabwe, Nicholas A. Otieno, Judith A. Odhiambo, Travis Parker, Kelvin Kamfwa\",\"doi\":\"10.1002/csc2.21362\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Drought is a major production constraint of common bean (<i>Phaseolus vulgaris</i> L.) worldwide. The objectives of this study were to (i) assess the agronomic and morpho-physiological response of Andean genotypes to terminal drought, and (ii) identify Andean genotypes with an ideal combination of agronomic and morpho-physiological traits for enhanced drought tolerance. Twenty Andean genotypes and seven checks were evaluated for drought tolerance in three field trials conducted in three locations. Agronomic and morpho-physiological traits including seed yield, seed weight, shoot dry weight, pod number, pod harvest index, harvest index, and carbon isotope discrimination (CID) were measured. Strong positive correlations were observed between seed yield, and partitioning efficiency metrics and CID (<i>r</i> = 0.57***) under drought, which suggested the important role of assimilate partitioning and water use efficiency in the observed drought tolerance. The heritability estimates for pod harvest index (<i>H</i><sup>2 </sup>= 0.88) and harvest index (<i>H</i><sup>2 </sup>= 0.87) were higher than for seed yield (<i>H</i><sup>2 </sup>= 0.43) and other morpho-physiological traits, thus they can be used to indirectly select for drought tolerance. Based on the relationship between seed yield and CID under drought stress, 12 genotypes were identified as drought tolerant with high water use efficiency. Among these, three were classified as water savers, while nine as water spenders. Genotypes with an ideal combination of superior shoot dry weight, partition efficiency, water use efficiency, and superior seed yield under both drought stress and non-stress conditions were identified. 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Agronomic and morpho-physiological response of Andean genotypes of common bean to terminal drought
Drought is a major production constraint of common bean (Phaseolus vulgaris L.) worldwide. The objectives of this study were to (i) assess the agronomic and morpho-physiological response of Andean genotypes to terminal drought, and (ii) identify Andean genotypes with an ideal combination of agronomic and morpho-physiological traits for enhanced drought tolerance. Twenty Andean genotypes and seven checks were evaluated for drought tolerance in three field trials conducted in three locations. Agronomic and morpho-physiological traits including seed yield, seed weight, shoot dry weight, pod number, pod harvest index, harvest index, and carbon isotope discrimination (CID) were measured. Strong positive correlations were observed between seed yield, and partitioning efficiency metrics and CID (r = 0.57***) under drought, which suggested the important role of assimilate partitioning and water use efficiency in the observed drought tolerance. The heritability estimates for pod harvest index (H2 = 0.88) and harvest index (H2 = 0.87) were higher than for seed yield (H2 = 0.43) and other morpho-physiological traits, thus they can be used to indirectly select for drought tolerance. Based on the relationship between seed yield and CID under drought stress, 12 genotypes were identified as drought tolerant with high water use efficiency. Among these, three were classified as water savers, while nine as water spenders. Genotypes with an ideal combination of superior shoot dry weight, partition efficiency, water use efficiency, and superior seed yield under both drought stress and non-stress conditions were identified. The identified genotypes can be used for genetic improvement of drought tolerance in the Andean gene pool of common bean.
期刊介绍：
Articles in Crop Science are of interest to researchers, policy makers, educators, and practitioners. The scope of articles in Crop Science includes crop breeding and genetics; crop physiology and metabolism; crop ecology, production, and management; seed physiology, production, and technology; turfgrass science; forage and grazing land ecology and management; genomics, molecular genetics, and biotechnology; germplasm collections and their use; and biomedical, health beneficial, and nutritionally enhanced plants. Crop Science publishes thematic collections of articles across its scope and includes topical Review and Interpretation, and Perspectives articles.
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