Drought is a major threat in agriculture and horticulture, including commercial strawberry production. Here, we compare hormonal regulation of a first-line drought stress response, namely stomatal closure, in two Fragaria x ananassa cultivars, known to differ in their drought stress phenotype. We show that the observed difference in xylem abscisic acid accumulation cannot explain the different stomatal responses under osmotic stress. Foliar abscisic acid accumulation cannot fully account for the stomatal behavior in one of both cultivars either. An indirect effect of abscisic acid on stomatal conductance via an impact on leaf hydraulic conductance, possibly mediated via aquaporins, as is recently proposed in literature, was not observed here. Next, we show that these two cultivars respond differently to jasmonic acid and one of its precursors. This difference in sensitivity of the jasmonates pathway between both cultivars may partly explain the different stomatal response. This study contributes to the understanding of the regulation of an important drought stress response in an economically important crop prone to water deficit stress.

中文翻译：

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茉莉酸途径而不是脱落酸可能部分解释了在渗透胁迫下两个草莓品种气孔反应的对比。

干旱是农业和园艺业的主要威胁，包括商业草莓生产。在这里，我们比较了已知的两种干旱胁迫表型不同的草莓（Fragaria x ananassa）品种对一线干旱胁迫响应（即气孔关闭）的激素调节。我们表明，观察到的木质部脱落酸积累的差异不能解释在渗透胁迫下不同的气孔反应。叶脱落酸的积累也不能完全说明两个品种之一的气孔行为。如文献中最近提出的那样，未观察到脱落酸通过对叶片水力传导的影响对气孔传导的间接作用，这可能是通过水通道蛋白介导的，如最近在文献中所提出的。接下来，我们表明这两个品种对茉莉酸及其前体之一的反应不同。两个品种之间茉莉酸途径的敏感性差异可能部分解释了不同的气孔反应。这项研究有助于理解重要的干旱胁迫反应的调控，这种干旱反应是在经济上很容易出现缺水胁迫的重要农作物中的。