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cGMP is involved in Zn tolerance through the modulation of auxin redistribution in root tips

文献类型： 外文期刊

作者： Zhang, Ping 1 ; Sun, Liangliang 1 ; Qin, Jun 3 ; Wan, Jinpeng 1 ; Wang, Ruling 1 ; Li, Shuang 1 ; Xu, Jin 1 ;

作者机构： 1.Chinese Acad Sci, Key Lab Trop Plant Resource & Sustainable Use, Xishuangbanna Trop Bot Garden, Mengla 666303, Yunnan, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Hebei Acad Agr & Forestry Sci, Natl Soyb

关键词： Auxin;cGMP;PIN4;Root development;Arabidopsis thaliana

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：5.545； 五年影响因子：5.99 ）

ISSN： 0098-8472

年卷期： 2018 年 147 卷

页码：

收录情况： SCI

摘要： Excess zinc (Zn) inhibits primary root (PR) growth but induces lateral root (LR) formation. Both auxin and cGMP play a role in controlling root growth in plants. However, whether and how their interaction is involved in Zn-regulated root development remain unclear. Here, we reported that excess Zn leads to auxin accumulation in root tips, as indicated by DR5:GUS expression. Further study showed that excess Zn represses PIN4:GFP abundance in root tips and that PR elongation and LR formation in the pin4 mutant is insensitive to excess Zn. Excess Zn also elevates cyclic guanosine monophosphate (cGMP) production in seedlings. Supplementation with the exogenous cGMP donor 8-bromoguanosine 3',5'-cyclic guanosine monophosphate (8-Br-cGMP) increased PR elongation and LR formation in Zn-treated seedlings, whereas the guanylate cyclase (GC) inhibitor LY83583 decreased these processes. Additional physiological and genetic analyses indicated that PIN4 is involved in cGMP-modulated root development in Zn-treated seedlings. Taken together, these results indicate that Zn-regulated cGMP production plays an important role in modulating root development by maintaining PIN4 abundance in excess Zn-treated roots and subsequent adaptation to Zn toxicity.

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