Agronomic and morpho-physiological response of Andean genotypes of common bean to terminal drought

IF 2 3区农林科学 Q2 AGRONOMY

Crop Science Pub Date : 2024-09-17 DOI:10.1002/csc2.21362

Swivia M. Hamabwe, Nicholas A. Otieno, Judith A. Odhiambo, Travis Parker, Kelvin Kamfwa

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引用次数: 0

Abstract

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.

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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

干旱是全世界蚕豆（Phaseolus vulgaris L.）生产的主要制约因素。本研究的目标是：(i) 评估安第斯基因型对终期干旱的农艺学和形态生理学反应；(ii) 确定具有理想的农艺学和形态生理学性状组合的安第斯基因型，以增强其耐旱性。在三个地点进行的三项田间试验中，对 20 个安第斯基因型和 7 个对照进行了耐旱性评估。对农艺性状和形态生理性状进行了测定，包括种子产量、种子重量、嫩枝干重、豆荚数、豆荚收获指数、收获指数和碳同位素鉴别（CID）。在干旱条件下，种子产量、分配效率指标和碳同位素分辨力（r = 0.57****）之间呈强正相关，这表明同化物分配和水分利用效率在观察到的耐旱性中起着重要作用。豆荚收获指数（H2 = 0.88）和收获指数（H2 = 0.87）的遗传力估计值高于种子产量（H2 = 0.43）和其他形态生理性状，因此可用于间接选择抗旱性。根据干旱胁迫下种子产量与 CID 之间的关系，12 个基因型被鉴定为具有高水分利用效率的耐旱基因型。其中，3 个基因型属于节水型，9 个属于耗水型。鉴定出的基因型在干旱胁迫和非胁迫条件下都具有优异的芽干重、分配效率、水分利用效率和优异的种子产量。所确定的基因型可用于安第斯蚕豆基因库中耐旱性的遗传改良。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Crop Science 农林科学-农艺学

CiteScore

4.50

自引率

8.70%

发文量

197

审稿时长

3 months

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.