Floral MADS box genes and homeotic gender dimorphism in Thalictrum dioicum (Ranunculaceae) -: a new model for the study of dioecy
Floral MADS box genes and homeotic gender dimorphism in Thalictrum dioicum (Ranunculaceae) -: a new model for the study of dioecy
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DOI：
10.1111/j.1365-313x.2005.02336.x
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发表时间：
2005-03-01
期刊：
影响因子：
7.2
通讯作者：
Baum, DA
中科院分区：
文献类型：
--
作者：
Di Stilio, VS;Kramer, EM;Baum, DA
在大多数雌雄异株的被子植物物种中，花最初是完美的，但在发育过程中，雄蕊或心皮脱落，表明性别决定发生在花器官身份已经建立之后。然而，雌雄异株的Thalumtrum属（草甸芸香）的成员产生缺乏败育器官的花。对T. Dioicum证实花从一开始就是雄性或雌性的，这提高了在器官同一性水平或更高水平上工作的遗传机制通过类稳态机制促进性别决定的可能性。为了研究这种可能性，我们从T. dioicum和两性种T.海栖藻在这些基因谱系中发现了早期和晚期重复事件的组合，并且表达分析表明这些事件通常与基因调控中的分歧相关。根据这些发现，我们讨论了T。dioicum作为研究真双子叶植物性别决定的新模式。
In most dioecious angiosperm species, flowers are initially perfect but abort either stamens or carpels during their development, indicating that sex determination occurs after floral organ identity has been established. Dioecious members of the genus Thalictrum (meadow-rue), however, produce flowers that lack aborted organs. Examination of early flower development of T. dioicum confirms that flowers are male or female from inception, raising the possibility that genetic mechanisms working at or above the level of organ identity promote sex determination through a homeotic-like mechanism. In order to investigate this possibility, we identified homologs of the organ identity genes PISTILLATA (PI), APETALA3 (AP3) and AGAMOUS (AG) from T. dioicum and the hermaphroditic species T. thalictroides. A combination of early and late duplication events was uncovered in these gene lineages and expression analyses indicate that these events are generally associated with divergence in gene regulation. In light of these findings, we discuss the potential of T. dioicum as a new model for the study of sex determination in the basal eudicots.