Shoot branching control by reduced culm number 4 in rice (Oryza sativa L.)
Shoot branching control by reduced culm number 4 in rice (Oryza sativa L.)
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DOI：
10.1016/j.plantsci.2009.02.015
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发表时间：
2009-06-01
期刊：
影响因子：
5.2
通讯作者：
Kato, Kiyoaki
中科院分区：
文献类型：
--
作者：
Ariyaratne, Mojith;Takamure, Itsuro;Kato, Kiyoaki
枝梢分枝是植物构型中的一个主要因素，也是影响生产力的一个重要农艺性状。在本研究中，我们的特点减少秆数4（rcn 4）突变体，即rcn 4 -1和rcn 4 -2。RCN 4在每个叶节上都能准确地产生腋芽，但这些腋芽的生长受到抑制。为了确定是否rcn 4参与分支抑制独脚金内酯途径，我们的特点是双突变体的rcn 4和分蘖矮化突变体，dwarf 10（d10），这是有缺陷的独脚金内酯合成。双突变体rcn 4d 10的腋芽活性介于rcn 4和d10突变体之间，表明Rcn 4控制腋芽活性，在独脚金内酯相关的分支抑制途径中不依赖于D10。分子定位研究表明，Rcn 4位于水稻1号染色体长臂上的简单重复序列标记RM 6581和RM 6608之间。我们认为，Rcn 4是一个很好的候选人，为进一步调查独脚金内酯的独立分支途径。(C)2009爱思唯尔爱尔兰有限公司保留所有权利。
Shoot branching is a major factor in plant architecture and an important agronomic trait for productivity. In the present study, we characterized reduced culm number 4 (rcn4) mutants in rice, namely rcn4-1 and rcn4-2. rcn4 developed axillary buds precisely at each leaf node, but the outgrowth of these buds was inhibited. To determine whether rcn4 is involved in a branch-inhibiting strigolactone pathway, we characterized the double mutant of rcn4 and a tillering dwarf mutant, dwarf10 (d10), which is defective in strigolactone synthesis. The axillary bud activity of rcn4d10 double mutant was between that of the rcn4 and d10 mutants suggesting that Rcn4 controls axillary bud activity and is independent of D10 in the strigolactone associated branching inhibition pathway. Molecular mapping study demonstrated that Rcn4 is located between simple sequence repeat markers RM6581 and RM6608 on the long arm of rice chromosome 1. We suggest that Rcn4 is a good candidate for further investigation of the strigolactone independent branching pathway. (C) 2009 Elsevier Ireland Ltd. All rights reserved.