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Chloroplast avoidance movement: a novel paradigm of ROS signalling
Photosynthesis Research ( IF 3.7 ) Pub Date : 2020-03-28 , DOI: 10.1007/s11120-020-00736-9
Arkajo Majumdar , Rup Kumar Kar

The damaging effects of supra-optimal irradiance on plants, often turning to be lethal, may be circumvented by chloroplast avoidance movement which realigns chloroplasts to the anticlinal surfaces of cells (parallel to the incident light), essentially minimizing photon absorption. In angiosperms and many other groups of plants, chloroplast avoidance movement has been identified to be a strong blue light (BL)-dependent process being mediated by actin filaments wherein phototropins are identified as the photoreceptor involved. Studies through the last few decades have identified key molecular mechanisms involving Chloroplast Unusual Positioning 1 (CHUP1) protein and specific chloroplast-actin (cp-actin) filaments. However, the signal transduction pathway from strong BL absorption down to directional re-localization of chloroplasts by actin filaments is complex and ambiguous. Being the immediate cellular products of high irradiance absorption and having properties of remodelling actin as well as phototropin, reactive oxygen species (ROS) deemed to be more able and prompt than any other signalling agent in mediating chloroplast avoidance movement. Although ROS are presently being identified as fundamental component for regulating different plant processes ranging from growth, development and immunity, its role in avoidance movement have hardly been explored in depth. However, few recent reports have demonstrated the direct stimulatory involvement of ROS, especially H2O2, in chloroplast avoidance movement with Ca2+ playing a pivotal role. With this perspective, the present review discusses the mechanisms of ROS-mediated chloroplast avoidance movement involving ROS-Ca2+-actin communication system and NADPH oxidase (NOX)—plasma membrane (PM) H+-ATPase positive feed-forward loop. A possible working model is proposed.



中文翻译:

叶绿体回避运动:ROS信号传导的新范式

叶绿体回避运动可避免叶绿体超移动对植物的破坏性作用,这种危害通常转为致命性,而叶绿体回避运动会使叶绿体重新排列到细胞的背斜表面(平行于入射光),从而使光子吸收最小化。在被子植物和许多其他植物类群中,叶绿体回避运动已被确定是由肌动蛋白丝介导的强蓝光(BL)依赖性过程,其中光蛋白被鉴定为所涉及的光感受器。过去几十年的研究已经确定了涉及叶绿体异常定位1(CHUP1)蛋白和特定叶绿体肌动蛋白(cp-actin)细丝的关键分子机制。然而,从强BL吸收到肌动蛋白丝对叶绿体定向再定位的信号转导途径是复杂而模棱两可的。作为高辐射吸收的直接细胞产物,并具有重塑肌动蛋白和光养蛋白的特性,活性氧(ROS)被认为比任何其他信号传导剂在介导叶绿体回避运动方面都更能干,更迅速。尽管目前ROS被认为是调节不同植物过程(从生长,发育和免疫)的基本组成部分,但几乎没有深入研究其在回避运动中的作用。但是,最近的报道很少证明ROS尤其是H的直接刺激作用。作为高辐射吸收的直接细胞产物,并具有重塑肌动蛋白和光养蛋白的特性,活性氧(ROS)被认为比任何其他信号传导剂在介导叶绿体回避运动方面都更能干,更迅速。尽管目前ROS被认为是调节不同植物过程(从生长,发育和免疫)的基本组成部分,但几乎没有深入研究其在回避运动中的作用。但是,最近的报道很少证明ROS尤其是H的直接刺激作用。作为高辐射吸收的直接细胞产物,并具有重塑肌动蛋白和光蛋白的特性,活性氧(ROS)被认为比任何其他信号传导剂在介导叶绿体回避运动中都更能干,更迅速。尽管目前ROS被认为是调节不同植物过程(从生长,发育和免疫)的基本组成部分,但几乎没有深入研究其在回避运动中的作用。但是,最近的报道很少证明ROS尤其是H的直接刺激作用。尽管目前ROS被认为是调节不同植物过程(从生长,发育和免疫)的基本组成部分,但几乎没有深入研究其在回避运动中的作用。但是,最近的报道很少证明ROS尤其是H的直接刺激作用。尽管目前ROS被认为是调节不同植物过程(从生长,发育和免疫)的基本组成部分,但几乎没有深入研究其在回避运动中的作用。但是,最近的报道很少证明ROS尤其是H的直接刺激作用。2 O 2在避免叶绿体中与Ca 2+的运动起关键作用。从这个角度出发,本综述讨论了ROS介导的叶绿体回避运动的机制,该机制涉及ROS-Ca 2 +-肌动蛋白通讯系统和NADPH氧化酶(NOX)-质膜(PM)H + -ATPase阳性前馈环。提出了一种可能的工作模型。

更新日期:2020-04-22
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