Suppression of tiller bud activity in tillering dwarf mutants of rice
Suppression of tiller bud activity in tillering dwarf mutants of rice
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DOI：
10.1093/pcp/pci022
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发表时间：
2005-01-01
影响因子：
4.9
通讯作者：
Kyozuka, J
中科院分区：
文献类型：
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作者：
Ishikawa, S;Maekawa, M;Kyozuka, J
在这项研究中，我们分析了五个分蘖矮秆突变体，表现出降低植株高度和增加分蘖数。我们发现，在突变体，腋生分生组织正常建立，但抑制分蘖芽活动减弱。分蘖矮化突变体的表型表明，它们在控制分蘖芽休眠，抑制芽活力方面发挥作用。然而，分蘖矮秆突变体的生长表现出节位和种植密度的依赖性，这意味着分蘖矮秆基因的功能不受芽活力的发育和环境控制。图位克隆的D3基因显示，它编码一个F-box亮氨酸重复序列（LRR）蛋白，与拟南芥MAX2/ORE9同源。这表明控制腋芽活性的机制在单子叶植物和真双子叶植物之间是保守的。我们认为，分蘖矮秆突变体是合适的芽活性控制在水稻的研究，并相信未来的分子和遗传研究，利用它们可能会在理解控制分蘖和芽分枝显着的进展。
In this study, we analyzed five tillering dwarf mutants that exhibit reduction of plant stature and an increase in tiller numbers. We show that, in the mutants, axillary meristems are normally established but the suppression of tiller bud activity is weakened. The phenotypes of tillering dwarf mutants suggest that they play roles in the control of tiller bud dormancy to suppress bud activity. However, tillering dwarf mutants show the dependence of both node position and planting density on their growth, which implies that the functions of tillering dwarf genes are independent of the developmental and environmental control of bud activity. Map-based cloning of the D3 gene revealed that it encodes an F-box leucine-trich repeat (LRR) protein orthologous to Arabidopsis MAX2/ORE9. This indicates the conservation of mechanisms controlling axillary bud activity between monocots and eudicots. We suggest that tillering dwarf mutants are suitable for the study of bud activity control in rice and believe that future molecular and genetic studies using them may enable significant progress in understanding the control of tillering and shoot branching.