BPG3 is a novel chloroplast protein that involves the greening of leaves and related to brassinosteroid signaling
BPG3 is a novel chloroplast protein that involves the greening of leaves and related to brassinosteroid signaling
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DOI：
10.1080/09168451.2014.885831
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发表时间：
2014-03
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通讯作者：
Eriko Yoshizawa;Mai Kaizuka;A. Yamagami;Mieko Higuchi-Takeuchi;M. Matsui;Yusuke Kakei;Y. Shimada;M. Sakuta;H. Osada;T. Asami;T. Nakano
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作者：
Eriko Yoshizawa;Mai Kaizuka;A. Yamagami;Mieko Higuchi-Takeuchi;M. Matsui;Yusuke Kakei;Y. Shimada;M. Sakuta;H. Osada;T. Asami;T. Nakano
油菜素内酯是调节植物器官和叶绿体发育的植物类固醇激素。BR信号在植物发育中的具体分子机制尚不清楚，BR信号与叶绿体发育之间的关系尚不清楚。我们从拟南芥FOX系中鉴定出显性突变体Brz- insensitivity -pale green3-1D (bpg3-1D)，该突变体对BR生物合成抑制剂Brassinazole （Brz）在光照下促进叶绿素积累的敏感性降低。BPG3编码一种在细菌、藻类和高等植物中进化保守的新型叶绿体蛋白。光照和Brz诱导BPG3的表达。bpg3-1D对叶绿体光系统II中的电子传递有抑制作用。这些结果表明，BPG3在BR信号下调控叶绿体光合作用中发挥了重要作用。br -抑制剂Brz激活叶绿体功能。bpg3 （brz - insensitivity -pale green3）突变体在brz缺乏状态到叶绿体激活的信号传导过程中被中断。
Brassinosteroids are plant steroid hormones that regulate plant organs and chloroplast development. The detailed molecular mechanism for plant development by BR signaling is yet to be revealed, and many points regarding the relationship between BR signaling and chloroplast development remain unknown. We identify here the dominant mutant Brz-insensitive-pale green3-1D (bpg3-1D) from the Arabidopsis FOX lines that show reduced sensitivity to the chlorophyll accumulation promoted by the BR biosynthesis inhibitor, Brassinazole (Brz), in the light. BPG3 encodes a novel chloroplast protein that is evolutionally conserved in bacteria, algae, and higher plants. The expression of BPG3 was induced by light and Brz. The inhibition of electron transport in photosystem II of the chloroplasts was detected in bpg3-1D. These results suggest that BPG3 played an important role in regulating photosynthesis in the chloroplast under BR signaling. Graphical Abstract BR-inhibitor Brz activated chloroplast functions. bpg3 (Brz-insensitive-pale green3) mutant is disrupted in the signaling from BR-deficient condition to chloroplast activation.