Boualem Adnane, Fergany Mohamed, Fernandez Ronan, Troadec Christelle, Martin Antoine, Morin Halima, Sari Marie-Agnes, Collin Fabrice, Flowers Jonathan M, Pitrat Michel, Purugganan Michael D, Dogimont Catherine, Bendahmane Abdelhafid
INRA (Institut National de la Recherche Agronomique)-CNRS, UMR1165, Unité de Recherche en Génomique Végétale, 2 rue Gaston Crémieux, F-91057 Evry, France.
Science. 2008 Aug 8;321(5890):836-8. doi: 10.1126/science.1159023.
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.
雄花两性花同株是被子植物中一种广泛存在的性系统，其特征是植株上同时带有雄花和两性花。在甜瓜中，这种性型由雄花两性花同株（a）位点上等位基因的特性所控制。a基因的克隆表明，雄花两性花同株是由1-氨基环丙烷-1-羧酸合成酶活性位点的突变导致的。活性酶的表达会抑制雄性器官的发育，而心皮发育并不需要该酶的表达。已鉴定出一个与雄花两性花同株相关的因果单核苷酸多态性，这表明a等位基因最近受到了正选择，并且可能与这种性系统的进化有关。
