Department of Biology, Faculty of Science, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan.
Graduate School of Sciences and Technology for Innovation, 1677-1 Yoshida, Yamaguchi, 753-8512, Japan.
Nat Commun. 2017 Nov 3;8(1):1284. doi: 10.1038/s41467-017-01237-5.
Stomata regulate gas exchange between plants and atmosphere by integrating opening and closing signals. Stomata open in response to low CO concentrations to maximize photosynthesis in the light; however, the mechanisms that coordinate photosynthesis and stomatal conductance have yet to be identified. Here we identify and characterize CBC1/2 (CONVERGENCE OF BLUE LIGHT (BL) AND CO 1/2), two kinases that link BL, a major component of photosynthetically active radiation (PAR), and the signals from low concentrations of CO in guard cells. CBC1/CBC2 redundantly stimulate stomatal opening by inhibition of S-type anion channels in response to both BL and low concentrations of CO. CBC1/CBC2 function in the signaling pathways of phototropins and HT1 (HIGH LEAF TEMPERATURE 1). CBC1/CBC2 interact with and are phosphorylated by HT1. We propose that CBCs regulate stomatal aperture by integrating signals from BL and CO and act as the convergence site for signals from BL and low CO
气孔通过整合开放和关闭信号来调节植物与大气之间的气体交换。气孔在低 CO 浓度下开放，以最大限度地提高光照下的光合作用；然而，协调光合作用和气孔导度的机制尚未确定。在这里，我们鉴定并表征了 CBC1/2（蓝光（BL）和 CO1/2 的会聚），这两种激酶将 BL（光合作用有效辐射（PAR）的主要成分）与保卫细胞中低浓度 CO 的信号联系起来。CBC1/CBC2 通过抑制 S 型阴离子通道对 BL 和低浓度 CO 的反应，冗余地刺激气孔开放。CBC1/CBC2 在光受体和 HT1（高叶温 1）的信号通路中发挥作用。CBC1/CBC2 与 HT1 相互作用并被其磷酸化。我们提出，CBC 通过整合 BL 和 CO 的信号来调节气孔孔径，并作为 BL 和低 CO 信号的会聚位点。
