phytochrome B Is required for light-mediated systemic control of stomatal development.
phytochrome B Is required for light-mediated systemic control of stomatal development.
复制标题
植物色素B是对气孔发育的光介导的全身控制所必需的。
DOI：
10.1016/j.cub.2014.03.074
复制
发表时间：
2014-06-02
期刊：
影响因子：
9.2
通讯作者：
Hetherington, Alistair M.
中科院分区：
文献类型：
--
作者：
Casson, Stuart A.;Hetherington, Alistair M.
气孔是在叶子表面发现的孔，它们调节植物与环境之间的气体交换。气孔的发育是高度可塑的，并受环境信号的影响。光刺激气孔发育，并且该响应由植物光感受器介导，其中红光光感受器光敏色素B（phyB）在白色光中具有主导作用。光还系统地调节气孔发育，成熟叶片感受到的辐照度调节幼叶的气孔发育。在这里，我们表明，phyB是需要这种全身反应。使用组织特异性表达和诱导表达系统的功能丧失phyB-9突变体的组合，我们表明，phyB在气孔谱系，叶肉，韧皮部的表达是足以恢复野生型气孔发育。诱导PHYB在成熟叶片中也拯救气孔发育在年轻的未处理的叶片，而phyB突变体是有缺陷的气孔发育的系统调节。我们的数据表明，phyB的行为系统地调节叶表皮细胞的命运决定。在气孔发育的光介导的系统控制过程中需要phyB光介导的气孔发育不需要phyB在表皮中的表达成熟phyB-9叶中的PHYB表达挽救幼叶中的气孔发育phyB-9突变体在光介导的系统气孔发育中有缺陷气孔发育受光调节，其需要红光光感受器光敏色素B。通过使用组织特异性和诱导型phyB表达，Casson和Hetherington表明phyB在气孔谱系内和系统地调节气孔发育。
Stomata are pores found on the surfaces of leaves, and they regulate gas exchange between the plant and the environment. Stomatal development is highly plastic and is influenced by environmental signals. Light stimulates stomatal development, and this response is mediated by plant photoreceptors, with the red-light photoreceptor phytochrome B (phyB) having a dominant role in white light. Light also regulates stomatal development systemically, with the irradiance perceived by mature leaves modulating stomatal development in young leaves. Here, we show that phyB is required for this systemic response. Using a combination of tissue-specific expression and an inducible expression system in the loss-of-function phyB-9 mutant, we show that phyB expression in the stomatal lineage, mesophyll, and phloem is sufficient to restore wild-type stomatal development. Induction of PHYB in mature leaves also rescues stomatal development in young untreated leaves, whereas phyB mutants are defective in the systemic regulation of stomatal development. Our data show that phyB acts systemically to regulate cell fate decisions in the leaf epidermis. phyB is required during the light-mediated systemic control of stomatal development Light-mediated stomatal development does not require phyB expression in the epidermis PHYB expression in mature phyB-9 leaves rescues stomatal development in young leaves phyB-9 mutants are defective in light-mediated systemic stomatal development Stomatal development is regulated by light, which requires the red-light photoreceptor phytochrome B. By using both tissue-specific and inducible phyB expression, Casson and Hetherington show that phyB acts both within the stomatal lineage and systemically to regulate stomatal development.
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