The SHOOT ORGANIZATION2 gene coordinates leaf domain development along the central-marginal axis in rice.
The SHOOT ORGANIZATION2 gene coordinates leaf domain development along the central-marginal axis in rice.
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DOI：
10.1093/pcp/pcn099
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发表时间：
2008-08
影响因子：
4.9
通讯作者：
J. Itoh;Yutaka Sato;Y. Nagato
中科院分区：
文献类型：
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作者：
J. Itoh;Yutaka Sato;Y. Nagato
我们描述了水稻叶片是如何区域化和调节沿着中央边缘轴。芽组织2（sho 2）突变体是水稻中的ZIPPY/ARGONAUTE 7同源物SHOOTLESS 4的弱等位基因，其显示出多种叶异常;丝状叶、二分叉或三叉叶、丝状结构与叶片分离或边缘缺失。所有这些表型都可以解释为在中心域的生长占主导地位的条件下，中心域、侧域和边缘域沿着中心-边缘轴的生长中的组合缺陷。侧域和边缘域的叶创始人细胞在sho 2中正常募集，表明sho 2在募集创始人细胞后叶域的生长中有缺陷。SHO 2在茎尖分生组织外层和叶近轴面的表达模式，以及HD-ZIP III和ETTIN同源物在SHO 2叶中央域的改变表达，表明中央域的正常发育是三个域同步生长的先决条件。这种同步被认为是由一个小的干扰RNA依赖性过程介导的。
We describe how rice leaves are regionalized and regulated along the central-marginal axis. The shoot organization2 (sho2) mutant, a weak allele of SHOOTLESS4 that is a ZIPPY/ARGONAUTE7 homolog in rice, shows a variety of leaf abnormalities; filamentous leaves, bi- or trifurcated leaves, separation of the filamentous structure from the leaf blade or deletion of the margin. All of these phenotypes can be interpreted as combinatorial defects in the growth of the central, lateral and marginal domains along the central-marginal axis, on the condition that the growth of the central domain is predominant. The leaf founder cells for the lateral and marginal domains are recruited normally in sho2, indicating that sho2 is defective in the growth of leaf domains after the founder cells are recruited. The expression pattern of SHO2 in the outer layer of the shoot apical meristem and the adaxial surface of the leaf, as well as the altered expression of HD-ZIP III and ETTIN homologs in the central domain of sho2 leaves, suggest that normal development of the central domain is a prerequisite for the synchronous growth of the three domains. This synchrony is thought to be mediated by a small interfering RNA-dependent process.