Regulation of lateral root formation by auxin signaling in Arabidopsis
Regulation of lateral root formation by auxin signaling in Arabidopsis
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DOI：
10.5511/plantbiotechnology.22.393
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发表时间：
2005-12
影响因子：
1.6
通讯作者：
H. Fukaki;Y. Okushima;M. Tasaka
中科院分区：
文献类型：
--
作者：
H. Fukaki;Y. Okushima;M. Tasaka
在高等植物中，侧根（LR）的形成是土壤中根构型的主要贡献者。虽然众所周知，生长素促进LR的形成，但调节生长素介导的LR形成的分子机制仍然是未知的。最近使用拟南芥突变体的分子遗传学研究表明，由两个家族的转录调节因子Aux/IAAs（生长素/吲哚-3-乙酸;生长素应答转录的阻遏物）和ARF（生长素应答因子;生长素应答转录的激活物或阻遏物）介导的正常生长素信号传导对于LR形成是必需的。在根周膜中由SLR/IAA 14和ARF 7/ARF 19介导的生长素应答转录对于LR起始特别重要。本文综述了生长素信号调节拟南芥LR形成的已知情况，并讨论了Aux/IAAs和ARF在LR启动和随后的原始发育中的作用。
In higher plants, lateral root (LR) formation is a major contributor to root architecture in the soil. Although it is well known that auxin promotes LR formation, the molecular mechanisms that regulate auxin-mediated LR formation are still largely unknown. Recent molecular genetic studies using Arabidopsis mutants have shown that normal auxin signaling mediated by two families of transcriptional regulators, Aux/IAAs (Auxin/Indole-3-Acetic Acid; repressors of auxin-responsive transcription) and ARFs (Auxin Response Factor; activators or repressors of auxin-responsive transcription), is necessary for LR formation. Auxin-responsive transcription mediated by SLR/IAA14 and ARF7/ARF19 in the root pericycle is particularly important for LR initiation. This review summarizes what is known about the auxin signaling that regulates LR formation in Arabidopsis, and discusses the role of Aux/IAAs and ARFs for LR initiation and subsequent primordial development.