A conserved mutation in an ethylene biosynthesis enzyme leads to andromonoecy in melons
A conserved mutation in an ethylene biosynthesis enzyme leads to andromonoecy in melons
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DOI：
10.1126/science.1159023
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发表时间：
2008-08-08
期刊：
影响因子：
56.9
通讯作者：
Bendahmane, Abdelhafid
中科院分区：
文献类型：
--
作者：
Boualem, Adnane;Fergany, Mohamed;Bendahmane, Abdelhafid
雄核单性花是被子植物中广泛存在的一种有性系统，其特征是植物既有雄花又有两性花。在甜瓜中，这种性别形式是由雄花两性花同株（a）基因座上的等位基因的同一性控制的。a基因的克隆揭示了雄激素单酯酶是由1-氨基环丙烷-1-羧酸合酶活性位点的突变引起的。活性酶的表达抑制雄性器官的发育，并且不是心皮发育所必需的。一个因果单核苷酸多态性与andromonopolysaccharide被确定，这表明等位基因一直在最近的积极选择，并可能与这种性系统的进化。
Andromonoecy is a widespread sexual system in angiosperms characterized by plants carrying both male and bisexual flowers. In melon, this sexual form is controlled by the identity of the alleles at the andromonoecious (a) locus. Cloning of the a gene reveals that andromonoecy results from a mutation in the active site of 1-aminocyclopropane-1-carboxylic acid synthase. Expression of the active enzyme inhibits the development of the male organs and is not required for carpel development. A causal single-nucleotide polymorphism associated with andromonoecy was identified, which suggests that the a allele has been under recent positive selection and may be linked to the evolution of this sexual system.