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首页> 外文期刊>Middle Eastern and Russian Journal of Plant Science and Biotechnology >Drought Tolerance Indices, their Relationships and Manner of Application to Wheat Breeding Programs
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Drought Tolerance Indices, their Relationships and Manner of Application to Wheat Breeding Programs

机译：耐旱指数，它们之间的关系以及在小麦育种计划中的应用方式

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摘要

Terminal moisture stress in irrigated wheat farms causes a significant reduction in quantity and quality of grain yield in Iran. In order to identify wheat varieties tolerant to late season shortage of water, and also to find how drought resistance indices should be applied in screening practices, this study was performed in a temperate region wheat breeding program of Iran for irrigated wheat. In this study 291 advanced breeding lines and cultivars of hexaploid wheat were planted in two field trials, one under normal irrigation and another one under water deficit. The normal trial received 6 times furrow irrigation from 3rd May until 21st June, while the water stressed trial received only one irrigation in spring at the anthesis stage. Drought resistance indices including stress susceptibility index (SSI), tolerance index (TOL), mean productivity (MP), stress tolerance index (STI) and geometric mean productivity (GMP) were calculated for all investigated entries. Correlation coefficients among these indices were calculated and interpreted. STI and GMP were found to be the better indices than the other three for screening drought tolerant wheat varieties in breeding programs. In spite of this, the STI value was still significantly affected by higher yield in one of the normal or stressed conditions. To overcome this inefficiency a 2-step screening strategy was applied. At first grain yield in both conditions along with STI was used for clustering of evaluated genotypes to ensure grouping of genotypes based on high yield in both environments and a higher STI value. Using this method, approximately four genotype groups (A, B, C and D) were determined, which led to the selection of 50 desired genotypes. Then SSI index was used to reselect the moredrought tolerant genotypes. This method led to a final selection of 33 breeding lines. This strategy is proposed to be applied in wheat breeding programs whose objective is drought tolerance.
机译：灌溉小麦农场的终极水分胁迫导致伊朗谷物产量和质量的大幅下降。为了确定耐晚季缺水的小麦品种，并发现在筛选实践中应如何应用抗旱指数，本研究在伊朗的温带地区小麦育种计划中进行。在这项研究中，在两个田间试验中种植了291个六倍体小麦高级育种品系和栽培种，一个在常规灌溉条件下，另一个在缺水条件下。从5月3日到6月21日，普通试验进行了6次沟灌，而缺水试验在春季的花期仅进行了一次灌溉。计算了所有调查条目的抗旱指数，包括应力敏感性指数（SSI），耐受指数（TOL），平均生产率（MP），应力耐受指数（STI）和几何平均生产率（GMP）。计算并解释这些指标之间的相关系数。在育种计划中，STI和GMP被认为是筛选其他耐旱小麦品种的更好指标。尽管如此，在正常或胁迫条件之一下，STI值仍受较高产量的显着影响。为了克服这种低效率，应用了两步筛选策略。首先，两种条件下的谷物单产都与STI一起用于评估基因型的聚类，以确保基于两种环境下的高产量和更高的STI值对基因型进行分组。使用这种方法，确定了大约四个基因型组（A，B，C和D），从而选择了50种所需的基因型。然后使用SSI指数重新选择耐干旱的基因型。该方法最终选择了33个育种系。建议将该策略应用于以耐旱性为目标的小麦育种计划。

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