Linking photoreceptor excitation to changes in plant architecture
Linking photoreceptor excitation to changes in plant architecture
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DOI：
10.1101/gad.187849.112
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发表时间：
2012-04-15
影响因子：
10.5
通讯作者：
Chory, Joanne
中科院分区：
文献类型：
--
作者：
Li, Lin;Ljung, Karin;Chory, Joanne
植物通过降低红光与远红光的比例来感知邻居的接近，这引发了一系列的发育反应。在拟南芥中，光敏色素B（PHYB）是遮荫的主要传感器，但PHYB的激发还没有直接联系到生长反应。我们发现，碱性螺旋-环-螺旋（bHLH）转录因子PIF 7（光敏色素相互作用因子7），PHYB的相互作用，积累在其去磷酸化形式的阴影，使其能够结合生长素生物合成基因，并增加其表达。通过PIF 7调节途径合成的新生长素是阴影诱导生长所必需的，直接将光质量信号的感知与快速生长反应联系起来。
Plants sense neighbor proximity as a decrease in the ratio of red to far-red light, which triggers a series of developmental responses. In Arabidopsis, phytochrome B (PHYB) is the major sensor of shade, but PHYB excitation has not been linked directly to a growth response. We show that the basic helix-loop-helix (bHLH) transcription factor PIF7 (phytochrome-interacting factor 7), an interactor of PHYB, accumulates in its dephosphorylated form in shade, allowing it to bind auxin biosynthetic genes and increase their expression. New auxin synthesized through a PIF7-regulated pathway is required for shade-induced growth, linking directly the perception of a light quality signal to a rapid growth response.