中文摘要：

在植物的 Germlines 在 embryonic 以后开发期间是形成的 de novo，当很少对机制被知道控制这个过程时。在 Arabidopsis，控制这个过程的最早的基因是 SPOROCYTELESS (系统程序设计语言) 。一十年以前，我们证明系统程序设计语言功能的损失在 Arabidopsis 的男、女的机关废除了孢子。然而，它的功能是不清楚的直到现在。在这研究，我们证明系统程序设计语言属于在 embryophyte 特定的一个新奇抄写抑压者家庭，它到目前为止在陆地植物由 173 个成员组成。所有在他们的 N 终端和乙烯应答的元素绑定他们包含一个保存系统程序设计语言主题在 C 终端的联系因素的 amphiphilic 压抑(耳朵) 主题，因此指明了同样像系统程序设计语言的、包含耳朵的蛋白质(矛) 。一致地，系统程序设计语言在酵母和烟草房间充当一个 transcriptional 抑压者，并且矛蛋白质能与对方 invitro 形成 homodimer 或 heterodimer。而且，矛在酵母房间经由 EAR 主题和 TCP 家庭抄写因素与 TOPLESS (TPL ) 合作抑压者交往。一起，我们建议系统程序设计语言和矛很可能在可以在植物起许多发展作用的陆地植物属于一个新奇抄写抑压者家庭。

英文摘要：

Germlines in plants are formed de novo during post-embryonic development, while little is known about the mechanism that controls this process. In Arabidopsis, the earliest gene controlling this process is SPOROCYTELESS （SPL）. A decade ago, we showed that loss of SPL function abolished sporogenesis in both male and female organs of Arabidopsis. However, its function is unclear up to now. In this study, we showed that SPL belongs to a novel transcription repressor family specific in embryophyte, which consists of 173 members in the land plants so far. All of them contain a conserved SPL-motif in their N-terminal and an ethylene-responsive element binding factor-associated amphiphilic repression （EAR） motif in the C-terminal, therefore designated as SPL-like, EAR-containing proteins （SPEARs）. Consis- tently, SPL acts as a transcriptional repressor in yeast and tobacco cells, and SPEAR proteins are able to form homodimer and/or het- erodimer with each other in vitro. Furthermore, SPEARs interact with the TOPLESS （TPL） co-repressors via the EAR motif and TCP family transcription factors in yeast cells. Together, we propose that SPL and SPEARs most likely belong to a novel transcription repressor family in land plants which may play a variety of developmental roles in plants.