Spatial Auxin Signaling Controls Leaf Flattening in Arabidopsis.
Spatial Auxin Signaling Controls Leaf Flattening in Arabidopsis.
复制标题
空间生长素信号控制拟南芥叶片扁平化。
DOI:
10.1016/j.cub.2017.08.042
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发表时间:
2017-10-09
期刊:
影响因子:
--
通讯作者:
Jiao Y
中科院分区:
文献类型:
--
作者:
Guan C;Wu B;Yu T;Wang Q;Krogan NT;Liu X;Jiao Y
The flattening of leaves to form broad blades is an important adaption that maximizes photosynthesis. However, the underlying molecular mechanism of this process remains unclear. The WUSCHEL-RELATED HOMEOBOX (WOX) genes WOX1 and PRS are expressed in the leaf marginal domain to enable leaf flattening, but the nature of WOX expression establishment remains elusive. Here we report that adaxial-expressed MONOPTEROS (MP) and abaxial-enriched auxin, together, act as positional cues for patterning the WOX domain. MP directly binds to the WOX1 and PRS promoters and activates their expression. Furthermore, redundant abaxial-enriched ARF repressors suppress WOX1 and PRS expression, also through direct binding. In particular, we show ARF2 is redundantly required with ARF3 and 4 to maintain the abaxial identity. Taken together, these findings explain how adaxial-abaxial polarity patterns the mediolateral axis and subsequent lateral expansion of leaves. The flattening of leaves to form broad blades is an important adaption. Guan et al. show that the adaxial-expressed MP, abaxial-enriched auxin, and abaxial-expressed ARF repressors together position WOX expression in the middle domain. This finding describes how adaxial-abaxial polarity patterns the mediolateral axis and thus leaf flattening.
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