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Novel Bisexual Flower Control Gene Regulates Sex Differentiation in Melon melo

文献类型： 外文期刊

作者： Wang, Zhongyuan 1 ; Zhang, Siyu 1 ; Yang, Yongchao 2 ; Li, Zheng 1 ; Li, Hao 1 ; Yu, Rong 3 ; Luan, Feishi 4 ; Zhang, Xian 1 ; Wei, Chunhua 1 ;

作者机构： 1.Northwest A&F Univ, Coll Hort, State Key Lab Crop Stress Biol Arid Areas, Yangling 712100, Peoples R China

2.Honghe Univ, Coll Biol & Agr Sci, Mengzi 661100, Peoples R China

3.Ningxia Acad Agr & Forestry Sci, Inst Hort, Yinchuan 750002, Peoples R China

4.Northeast Agr Univ, Key Lab Biol & Genet Improvement Hort Crops Northe, Minist Agr & Rural Affairs, Harbin 150030, Peoples R China

关键词： melon; unisexual flower; bisexual flower; ethylene; ethylene receptor

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.895； 五年影响因子：6.048 ）

ISSN： 0021-8561

年卷期：

页码：

收录情况： SCI

摘要： The sex-control system involves several mechanisms in melon. The present study identified a novel bisexual flower control gene from the hermaphroditic melon germplasm, different from the previously recognized one. Genetic analysis showed that a single recessive gene in the newly identified locus b controlled the bisexual flower phenotype in melons. We generated 1431 F2 segregating individuals for genetic mapping of locus b, which was delimited to a 47.94 kb region. Six candidate genes were identified in the delimited interval, and candidate No. 4 encoding melon CPR5 protein was selected as the suitable one for locus b and was denoted CmCPR5. CPR5 reportedly interacted with ethylene receptor ETR1 to regulate ethylene signal transduction. Moreover, the ethephon assays showed that the parental lines (unisexual line and bisexual line) had contrasting expression patterns of CmCPR5. The BiFC and LCI assays also confirmed that CmCPR5 interacted with CmETR1 in 0426 but not in Y101. However, crossover tests showed that CmETR1 functioned normally in both parental lines, suggesting CPR5 malfunction in Y101. This study proposed a corollary mechanism of bisexual flower regulation during stamen primordium development in which the inhibition of stamen primordia development was prevented by the malfunctioning CmCPR5, resulting in bisexual flowers.

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