Variation among wheat (Triticum easativum L.) genotypes in response to the drought stress: I - selection approaches
Variation among wheat (Triticum easativum L.) genotypes in response to the drought stress: I - selection approaches
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DOI：
10.1080/17429145.2018.1550817
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发表时间：
2019-01-01
影响因子：
3.2
通讯作者：
Szechynska-Hebda, Magdalena
中科院分区：
文献类型：
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作者：
Grzesiak, Stanislaw;Hordynska, Natalia;Szechynska-Hebda, Magdalena
采用农艺生理性状、耐旱指标、主成分分析和Ward法评价20个小麦基因型对干旱响应的差异。观察到测量的性状具有统计学上显着的相关性。干旱敏感性指数（DSI）、胁迫耐受指数（STI）和胁迫指数（SI）对于识别对干旱反应不同的基因型最有用。这些指标的实用性通过耐旱性的生理标志（即膜损伤和叶片水分状况）得到证实。还通过聚类方法验证了干旱胁迫期间生物量和谷物产量基因型的变化。最后，这项工作中提出的生理学和统计方法的整合，可以表明小麦的耐旱性具有共同的遗传背景，并选择最多样化的基因型。根据结果，我们向育种者推荐一种工具，可用于选择抗旱和对干旱敏感的基因型。
The agronomic and physiological traits, drought tolerance indexes, principal component analysis and Ward`s method were applied to assess the differences among 20 wheat genotypes in response to drought. Statistically significant correlation was observed for measured traits. Drought susceptibility index (DSI), stress tolerance index (STI) and stress index (SI) were most useful to identify genotypes differing in their response to drought. Utility of the indexes was confirmed by physiological markers of drought tolerance i.e. membrane injury and leaf water status. Variation of the genotypes in biomass and grain yield during drought stress was also verified by clustering methods. Finally, integration of physiological and statistical methods presented in this work, allows to both, indicate that tolerance to drought in wheat has a common genetic background, and select the most diverse genotypes. Based on the results, we recommend a tool for breeders, useful to select the genotypes resistant and sensitive to drought.