Any trait or trait-related allele can confer drought tolerance: just design the right drought scenario
Any trait or trait-related allele can confer drought tolerance: just design the right drought scenario
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DOI：
10.1093/jxb/err269
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发表时间：
2012-01-01
影响因子：
6.9
通讯作者：
Tardieu, Francois
中科院分区：
文献类型：
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作者：
Tardieu, Francois
大多数与耐旱性相关的性状具有双重效应，在非常严重的情况下是积极的，在温和的情况下是消极的，或者相反的趋势。它们的影响还取决于其他气候条件，如蒸发需求或光照，以及管理做法。这不仅适用于与细胞保护和避免有关的过程，而且适用于维持生长或光合作用、高水分利用效率、大根系或减少缺水情况下的流产率。因此，在一种干旱情景中取得的惊人结果对于改善其他缺水地区的粮食安全可能意义有限。关于耐旱性最相关的问题可能是，“在给定的地区或目标环境人口（TPE）中，给定的等位基因是否在相当比例的年份/情景中对产量产生积极影响？'; '在给定的站点或TPE中，在风险规避和保持性能之间的权衡是什么？一个特定的等位基因或特征会对气候变化产生越来越积极的影响吗？“在耐旱性方面已经取得了相当大的进展。然而，明确关联性状的耐受性干旱的情况下，可能会产生深远的影响的遗传策略，与必要的参与建模。
Most traits associated with drought tolerance have a dual effect, positive in very severe scenarios and negative in milder scenarios, or the opposite trend. Their effects also depend on other climatic conditions such as evaporative demand or light, and on management practices. This is the case for processes associated with cell protection and with avoidance, but also for the maintenance of growth or photosynthesis, high water use efficiency, large root systems or reduced abortion rate under water deficit. Therefore, spectacular results obtained in one drought scenario may have a limited interest for improving food security in other geographical areas with water scarcity. The most relevant questions on drought tolerance are probably, 'Does a given allele confer a positive effect on yield in an appreciable proportion of years/scenarios in a given area or target population of environment (TPE)?'; 'In a given site or TPE, what is the trade-off between risk avoidance and maintained performance?'; and 'Will a given allele or trait have an increasingly positive effect with climate change?' Considerable progress has already occurred in drought tolerance. Nevertheless, explicitly associating traits for tolerance to drought scenarios may have profound consequences on the genetic strategies, with a necessary involvement of modelling.