Department of Biosciences, Durham University, South Road, Durham DH1 3LE, UK; Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.
Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.
J Plant Physiol. 2020 Jul;250:153182. doi: 10.1016/j.jplph.2020.153182. Epub 2020 May 11.
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.
气孔开度受到严格调控，以在气体交换和水分保持之间达到最佳平衡。因此，稳态（基础）气孔开度是植物适应能力的关键组成部分。先前的研究表明，DELLA 蛋白作为气孔关闭的正调控因子发挥作用，其作用可被激素 ABA 增强，ABA 本身在介导耐旱性方面也很重要。DELLAs 受到多种促进植物生长的信号调控，其中最显著的是赤霉素，赤霉素已被证明可促进气孔张开。我们发现，DELLA 蛋白也被用于调控拟南芥的基础气孔开度。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开度是必需的。
