Stomatal aperture is tightly regulated in order to achieve the best compromise between gas exchange and water conservation. Steady-state (basal) stomatal aperture is therefore understandably a key component in plant fitness. It has been shown previously in tomato that DELLA proteins act as positive regulators of closure of stomata, and their action is enhanced by the hormone ABA, which is itself important in mediating drought stress tolerance. DELLAs are regulated by a variety of signals which promote plant growth, most notably the hormones gibberellins, which have been shown to promote stomatal opening. We have found that DELLA proteins are also used in Arabidopsis for regulating basal stomatal aperture. We also discovered that the perception of endogenous gibberellins via the GID1 receptors is necessary for optimal basal stomatal aperture.

中文翻译：

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拟南芥中的基础气孔孔径受 GA-DELLA 调控

气孔孔径受到严格调节，以实现气体交换和水分保持之间的最佳平衡。因此，稳态（基础）气孔孔径是植物适应性的关键组成部分，这是可以理解的。先前在番茄中已经表明，DELLA 蛋白作为气孔关闭的正调节因子，它们的作用被激素 ABA 增强，ABA 本身在介导干旱胁迫耐受性方面很重要。DELLA 受多种促进植物生长的信号调节，最显着的是激素赤霉素，其已被证明可促进气孔开放。我们发现 DELLA 蛋白也用于拟南芥中调节基础气孔孔径。我们还发现，通过 GID1 受体感知内源性赤霉素对于最佳基础气孔孔径是必要的。