Roles of the different components of magnesium chelatase in abscisic acid signal transduction.
Roles of the different components of magnesium chelatase in abscisic acid signal transduction.
复制标题
镁螯合酶不同成分在脱落酸信号转导中的作用
DOI:
10.1007/s11103-012-9965-3
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发表时间:
2012-11
影响因子:
5.1
通讯作者:
Zhang, Da-Peng
中科院分区:
文献类型:
--
作者:
Du, Shu-Yuan;Zhang, Xiao-Feng;Lu, Zekuan;Xin, Qi;Wu, Zhen;Jiang, Tao;Lu, Yan;Wang, Xiao-Fang;Zhang, Da-Peng
关键词:
The H subunit of Mg-chelatase (CHLH) was shown to regulate abscisic acid (ABA) signaling and the I subunit (CHLI) was also reported to modulate ABA signaling in guard cells. However, it remains essentially unknown whether and how the Mg-chelatase-catalyzed Mg-protoporphyrin IX-production differs from ABA signaling. Using a newly-developed surface plasmon resonance system, we showed that ABA binds to CHLH, but not to the other Mg-chelatase components/subunits CHLI, CHLD (D subunit) and GUN4. A newrtl1mutant allele of theCHLHgene inArabidopsis thalianashowed ABA-insensitive phenotypes in both stomatal movement and seed germination. Upregulation ofCHLI1resulted in ABA hypersensitivity in seed germination, while downregulation ofCHLIconferred ABA insensitivity in stomatal response inArabidopsis. We showed that CHLH and CHLI, but not CHLD, regulate stomatal sensitivity to ABA in tobacco (Nicotiana benthamiana). The overexpression lines of theCHLDgene showed wild-type ABA sensitivity inArabidopsis. Both theGUN4-RNA interference and overexpression lines ofArabidopsisshowed wild-type phenotypes in the major ABA responses. These findings provide clear evidence that the Mg-chelatase-catalyzed Mg-ProtoIX production is distinct from ABA signaling, giving information to understand the mechanism by which the two cellular processes differs at the molecular level.
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