n nnnSuppression of inflorescence leaf, or bract, growth has evolvedmultiple times in diverse angiosperm lineages, including thePoaceae and Brassicaceae. Studies of Arabidopsis thaliana mutantshave revealed several genes involved in bract suppression, butit is not known if these genes play a similar role in otherplants with suppressed bracts. We identified maize (Zea mays)tassel sheath (tsh) mutants, characterized by the loss of bractsuppression, that comprise five loci (tsh1-tsh5). We used map-basedcloning to identify Tsh1 and found that it encodes a GATA zinc-fingerprotein, a close homolog of HANABA TARANU (HAN) of Arabidopsis.The bract suppression function of Tsh1 is conserved throughoutthe grass family, as we demonstrate that the rice (Oryza sativa)NECK LEAF1 (NL1) and barley (Hordeum vulgare) THIRD OUTER GLUME(TRD) genes are orthologous with Tsh1. Interestingly, NL1/Tsh1/TRDexpression and function are not conserved with HAN. The existenceof paralogous NL1/Tsh1/TRD-like genes in the grasses indicatesthat the NL1/Tsh1/TRD lineage was created by recent duplicationsthat may have facilitated its neofunctionalization. A comparisonwith the Arabidopsis genes regulating bract suppression furthersupports the hypothesis that the convergent evolution of bractsuppression in the Poaceae involved recruitment of a distinctgenetic pathway.展开▼
机译：ABSTRACTn n
n TOP n <字体颜色= 464c53>抽象 n 介绍 n 结果 n 讨论 n 方法 n 参考文献 n n nnn抑制了花序叶或片的生长 包括 禾本科和十字花科的被子植物谱系。对拟南芥（Irabidopsis thaliana）突变体 的研究已经揭示了几种抑制片的基因，但尚不清楚这些基因是否在其他<中起类似的作用。 SUP> plant片被抑制的植物。我们鉴定了玉米（ Zea mays ）流苏鞘（ tsh ）突变体，其特征是片 抑制，包含五个基因座（ tsh1-tsh5 ）。我们使用基于图谱的 克隆来识别 Tsh1 ，发现它编码一个GATA锌指 蛋白，它是 HANABA的紧密同源物拟南芥的TARANU （ HAN ）。 Tsh1 的片抑制功能在整个 草科，因为我们证明了水稻（ Oryza sativa ） NECK LEAF1 （ NL1 ）和大麦（ Hordeum vulgare ） THIRD OUTER GLUME （ TRD ）基因与 Tsh1同源。有趣的是， HAN 不保留 NL1 / Tsh1 / TRD 的表达和功能。草中存在类似的 NL1 / Tsh1 / TRD样基因的 表明 表示 NL1 / Tsh1 / TRD 谱系是由最近的复制 创建的，这些复制可能有助于其新功能化。与拟南芥基因调控regulating片抑制作用的 的比较进一步 支持假说：the片 抑制作用的趋同进化。禾本科涉及募集独特的 遗传途径。展开▼
