Transcriptional regulation of PIN genes by FOUR LIPS and MYB88 during Arabidopsis root gravitropism.
Transcriptional regulation of PIN genes by FOUR LIPS and MYB88 during Arabidopsis root gravitropism.
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DOI：
10.1038/ncomms9822
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发表时间：
2015-11-18
影响因子：
16.6
通讯作者：
Le J
中科院分区：
文献类型：
--
作者：
Wang HZ;Yang KZ;Zou JJ;Zhu LL;Xie ZD;Morita MT;Tasaka M;Friml J;Grotewold E;Beeckman T;Vanneste S;Sack F;Le J
PIN 蛋白是生长素输出载体，可引导细胞间生长素流动，进而调节植物生长和发育的许多方面，包括对环境变化的反应。拟南芥 R2R3-MYB 转录因子 FOUR LIPS (FLP) 及其旁系同源物 MYB88 在气孔发育以及雌性生殖发育和应激反应过程中调节末端分裂。在这里，我们表明 FLP 和 MYB88 在调节主根和侧根重力感应细胞中 PIN3 和 PIN7 的转录方面发挥着冗余但不同的作用。一方面，FLP 参与主根对重力刺激的反应，而另一方面，FLP 和 MYB88 在建立侧根的向重力设定点角度方面互补。我们的结果支持一个模型，其中 FLP 和 MYB88 表达特异性决定 PIN3 和 PIN7 转录的时空模式，这与它们在根对重力反应期间的优先功能密切相关。
PIN proteins are auxin export carriers that direct intercellular auxin flow and in turn regulate many aspects of plant growth and development including responses to environmental changes. The Arabidopsis R2R3-MYB transcription factor FOUR LIPS (FLP) and its paralogue MYB88 regulate terminal divisions during stomatal development, as well as female reproductive development and stress responses. Here we show that FLP and MYB88 act redundantly but differentially in regulating the transcription of PIN3 and PIN7 in gravity-sensing cells of primary and lateral roots. On the one hand, FLP is involved in responses to gravity stimulation in primary roots, whereas on the other, FLP and MYB88 function complementarily in establishing the gravitropic set-point angles of lateral roots. Our results support a model in which FLP and MYB88 expression specifically determines the temporal-spatial patterns of PIN3 and PIN7 transcription that are closely associated with their preferential functions during root responses to gravity.