Banks J A
Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana 47907, USA.
Genetics. 1997 Dec;147(4):1885-97. doi: 10.1093/genetics/147.4.1885.
The sex of the haploid gametophyte of the fern Ceratopteris is determined by the presence or absence of the pheromone antheridiogen, which, when present, promotes male development and represses female development of the gametophyte. Several genes involved in sex determination in Ceratopteris have been identified by mutation. In this study, the epistatic interactions among new and previously described sex-determining mutants have been characterized. These results show that sex expression is regulated by two sets of genes defined by the FEM1 and TRA loci. Each promotes the expression of either male or female traits and simultaneosly represses the expression of the other. A model describing how antheridiogen regulates the expression of these genes and the sex of the gametophyte is described. The observation that some gametophytic sex-determining mutants have phenotypic effects on the sporophyte plant indicates that sex determination in the Ceratopteris gametophyte is regulated by a mechanism that also regulates sporophyte development.
水蕨（Ceratopteris）单倍体配子体的性别由性信息素成精子素的有无决定，当存在成精子素时，它会促进配子体的雄性发育并抑制其雌性发育。通过突变已鉴定出几个参与水蕨性别决定的基因。在本研究中，已对新的和先前描述的性别决定突变体之间的上位相互作用进行了表征。这些结果表明，性别表达受由FEM1和TRA基因座定义的两组基因调控。每组基因促进雄性或雌性性状的表达，同时抑制另一组基因的表达。本文描述了一个模型，该模型阐述了成精子素如何调控这些基因的表达以及配子体的性别。一些配子体性别决定突变体对孢子体植株有表型影响这一观察结果表明，水蕨配子体中的性别决定受一种也调控孢子体发育的机制调控。
