thick tassel dwarf1 encodes a putative maize ortholog of the Arabidopsis CLAVATA1 leucine-rich repeat receptor-like kinase
thick tassel dwarf1 encodes a putative maize ortholog of the Arabidopsis CLAVATA1 leucine-rich repeat receptor-like kinase
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DOI：
10.1242/dev.01671
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发表时间：
2005-03-01
期刊：
影响因子：
4.6
通讯作者：
Werr, W
中科院分区：
文献类型：
--
作者：
Bommert, P;Lunde, C;Werr, W
高等植物的发育取决于分生组织的活动，分生组织是在其侧面不断启动新器官的形成区域。分生组织必须维持干细胞更新和器官起始之间的平衡。在着迷的突变体中，器官起始无法跟上分生组织增殖的步伐。玉米的粗穗矮化1 (td1)突变影响雄性和雌性花序的发育。形成穗的雌性花序令人着迷，有额外的几排谷粒。雄花序或雄穗显示小穗密度增加。 td1 突变体中的花分生组织也受到影响；例如，雄花的雄蕊数量增加。这些结果表明 td1 在花序中发挥限制分生组织大小的作用。此外，td1突变体比正常兄弟姐妹稍短，表明td1也在营养发育中发挥作用。 td1 编码富含亮氨酸的重复受体样激酶 (LRR-RLK)，该激酶是拟南芥 CLAVATA1 蛋白的推定直系同源物。这些结果补充了之前的工作，表明 fasciatedear2 编码 CLAVATA2 样蛋白，并表明 CLAVATA 信号通路在单子叶植物中是保守的。 td1 位于影响种子行数、小穗密度和株高的数量性状基因座附近。我们讨论了玉米驯化过程中 td1 可能面临的选择压力。
Development in higher plants depends on the activity of meristems, formative regions that continuously initiate new organs at their flanks. Meristems must maintain a balance between stem cell renewal and organ initiation. In fasciated mutants, organ initiation fails to keep pace with meristem proliferation. The thick tassel dwarf1 (td1) mutation of maize affects both male and female inflorescence development. The female inflorescence, which results in the ear, is fasciated, with extra rows of kernels. The male inflorescence, or tassel, shows an increase in spikelet density. Floral meristems are also affected in td1 mutants; for example, male florets have an increase in stamen number. These results suggest that td1 functions in the inflorescence to limit meristem size. In addition, td1 mutants are slightly shorter than normal siblings, indicating that td1 also plays a role in vegetative development. td1 encodes a leucine-rich repeat receptor-like kinase (LRR-RLK) that is a putative ortholog of the Arabidopsis CLAVATA1 protein. These results complement previous work showing that fasciated ear2 encodes a CLAVATA2-like protein, and suggest that the CLAVATA signaling pathway is conserved in monocots. td1 maps in the vicinity of quantitative trait loci that affect seed row number, spikelet density and plant height. We discuss the possible selection pressures on td1 during maize domestication.