数字农科院2.0

CsAP3: A Cucumber Homolog to Arabidopsis APETALA3 with Novel Characteristics

文献类型： 外文期刊

作者： Sun, Jin-Jing;Li, Feng;Wang, Dong-Hui;Liu, Na;Gu, Hai-Tao;Zou, Cheng;Xu, Zhi-Hong;Bai, Shu-Nong;Sun, Jin-Jing;He, Chao-Xing;Huang, San-Wen;Sun, Jin-Jing;Li, Feng;Wang, Dong-Hui;Li, Xia;Liu, Na;Gu, Hai-Tao;Zou, Cheng;Luo, Jing-Chu;Xu, Zhi-Hong;Bai, Shu-Nong;Liu, Xiao-Feng;Zhang, Xiao-Lan;Bai, Shu-Nong

作者机构：

关键词： cucumber;unisexual flower development;MADS box genes;ethylene;stamen arrestment

期刊名称： FRONTIERS IN PLANT SCIENCE

ISSN： 1664-462X

年卷期： 2016 年 7 卷

页码：

收录情况： SCI

摘要： In our previous efforts to understand the regulatory mechanisms of cucumber unisexual flower development, we observed a stamen-specific down-regulation of the ethylene receptor CsETR1 in stage 6 female flowers of cucumber (Cucumis sativus L.). This down-regulation is correlated with the primordial anther-specific DNA damage that characterizes inappropriate stamen development in cucumber female flowers. To understand how CsETR1 is down regulated in the stamen, we characterized a cucumber MADS box gene homologous to Arabidopsis AP3, CsAP3. We demonstrated that CsAP3 is functionally equivalent to the Arabidopsis B-class MADS gene AP3. However, three novel characteristics of CsAP3 were found. These include firstly, binding and activating CsETR1 promoter in vitro and in vivo; secondly, containing a GV repeat in its C-terminus, which is conserved in cucurbits and required for the transcription activation; and thirdly, decreased expression as the node number increases, which is similar to that found for CsETR1. These findings revealed not only the conserved function of CsAP3 as a B-class floral identity gene, but also its unique functions in regulation of female flower development in cucumber.

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