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首页> 外文期刊>European Journal of Agronomy >Functional mechanisms of drought tolerance in maize through phenotyping and genotyping under well watered and water stressed conditions
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Functional mechanisms of drought tolerance in maize through phenotyping and genotyping under well watered and water stressed conditions

机译：水分和水分胁迫条件下通过表型和基因型分析玉米抗旱性的功能机制

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Developing tolerant genotypes is crucial for stabilizing maize productivity under drought stress conditions as it is one of the most important abiotic stresses affecting crop yields. Twenty seven genotypes of maize (Zea mays L.) were evaluated for drought tolerance for three seasons under well watered and water stressed conditions to identify interactions amongst various tolerance traits and grain yield as well as their association with SSR markers. The study revealed considerable genetic diversity and significant variations for genotypes, environment and genotype x environment interactions for all the traits. The ranking of genotypes based on drought susceptibility index for morpho-physiological traits was similar to that based on grain yield and principal component analysis. Analysis of trait - trait and trait - yield associations indicated significant positive correlations amongst the water relations traits of relative water content (RWC), leaf water potential and osmotic potential as well as of RWC with grain yield under water stressed condition. Molecular analysis using 40 SSRs revealed 32 as polymorphic and 62 unique alleles were detected across 27 genotypes. Cluster analysis resulted in categorization of the genotypes into five distinct groups which was similar to that using principal component analysis. Based on overall performance across seasons tolerant and susceptible genotypes were identified for eventual utilization in breeding programs as well as for QTL identification. The marker-trait association analysis revealed significant associations between few SSR markers with water relations as well as yield contributing traits under water stressed conditions. These associations highlight the importance of functional mechanisms of intrinsic tolerance and cumulative traits for drought tolerance in maize. (C) 2016 Elsevier B.V. All rights reserved.
机译：发展耐性基因型对于干旱胁迫条件下稳定玉米生产力至关重要，因为它是影响作物产量的最重要的非生物胁迫之一。评价了27个基因型玉米（Zea mays L.）在充水和缺水条件下三个季节的干旱耐受性，以鉴定各种耐受性状与谷物产量之间的相互作用以及它们与SSR标记的关联。研究发现，所有性状的基因型，环境和基因型x环境相互作用均具有相当大的遗传多样性和变异性。基于干旱易感性形态生理性状的基因型排序与基于谷物产量和主成分分析的基因型排序相似。性状-性状和性状-产量关联的分析表明，在水分胁迫条件下，相对含水量（RWC），叶片水势和渗透势以及RWC与谷物产量之间的水分关系特征之间具有显着的正相关。使用40个SSR进行的分子分析显示，在27个基因型中检测到32个多态性和62个独特等位基因。聚类分析将基因型分为五个不同的组，这与使用主成分分析的相似。基于整个季节的整体表现，确定了耐性和易感基因型，最终用于育种计划以及QTL鉴定。标记-性状关联分析表明，在水分胁迫条件下，少数SSR标记与水分关系以及产量贡献性状之间存在显着关联。这些联系突出了内在耐性和累积性状对玉米耐旱性的功能机制的重要性。 （C）2016 Elsevier B.V.保留所有权利。

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