Evaluation of bread wheat (Triticum aestivum L.) genotypes for yield and related traits under drought stress conditions
Evaluation of bread wheat (Triticum aestivum L.) genotypes for yield and related traits under drought stress conditions
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干旱胁迫条件下面包小麦（Triticum aestivum L.）基因型产量和相关性状的评价
DOI：
10.1080/09064710.2020.1767802
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
I. Mathew
中科院分区：
文献类型：
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作者：
Yared Semahegn;H. Shimelis;M. Laing;I. Mathew
干旱是威胁全球农作物生产的主要因素。发展适应干旱易发环境的小麦品种是提高小麦产量和生产力的可持续战略。本研究的目的是评价和选择面包小麦的产量和产量组成基因型，以及在干旱胁迫和非胁迫条件下的稳定性。采用10 × 12 α晶格设计，2个重复，在2018/19种植季的5个试验点评估了120个基因型。在每个地点的主要降雨开始后，使用不同的播种日期（早期播种代表无压力，而晚期播种作为干旱压力条件）施加干旱胁迫水平。记录籽粒产量及其构成因素，计算各基因型的干旱指数。在抗旱性指标中，GMP、MP、HM、STI和YI在干旱胁迫和非胁迫条件下均与产量呈显著正相关，最适合预测抗旱性。秩和分析结果显示，抗旱能力最强的基因型为“YS-34”、“YS-85”和“YS-82”。所选小麦基因型是未来埃塞俄比亚或类似农业生态的耐旱育种项目的有用遗传资源。
ABSTRACT Drought is a major factor threatening crop production worldwide. Developing wheat varieties that are adapted to drought prone environments is a sustainable strategy to improve wheat production and productivity. The aim of this study was to evaluate and select bread wheat genotypes for yield and yield components, and for stability under drought stress and non-stress conditions. One hundred and twenty genotypes were evaluated at five test sites in the 2018/19 cropping season using a 10 x 12 alpha lattice design with two replicates. The level of drought stress was imposed using different sowing dates (early planting representing non-stressed, while late planting as drought stressed conditions) following the onset of the main rain at each site. Grain yield and yield components were recorded, and drought indices were calculated for each genotype. Among the drought tolerance indices, GMP, MP, HM, STI and YI were found to be the most suitable for predicting drought tolerance because they had significant and positive correlations with yield under drought stress and non-stress conditions. Rank sum analysis identified the most drought tolerant genotypes as ‘YS-34', ‘YS-85' and ‘YS-82’. The selected wheat genotypes are useful genetic resources for future drought tolerance breeding programmes in Ethiopia or similar agro-ecologies.