PIFs coordinate shade avoidance by inhibiting auxin repressor ARF18 and metabolic regulator QQS
PIFs coordinate shade avoidance by inhibiting auxin repressor ARF18 and metabolic regulator QQS
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PIF 通过抑制生长素抑制因子 ARF18 和代谢调节因子 QQS 协调避荫
DOI：
10.1111/nph.16732
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发表时间：
2020-07-16
期刊：
影响因子：
9.4
通讯作者：
Ding, Zhaojun
中科院分区：
文献类型：
--
作者：
Jia, Yuebin;Kong, Xiangpei;Ding, Zhaojun
避荫综合征（SAS）出现在竞争光线的密集生长的植物中。在拟南芥中，光敏色素相互作用因子（PIF）蛋白通过生长素的产生将对遮荫的感知与茎的伸长联系起来。在这里，我们报告说，PIFs抑制遮荫诱导的生长素反应因子18（ARF 18）的表达，和ARF 18抑制生长素信号。因此，PIF介导的抑制ARF 18增强了模拟遮荫下生长素依赖的下胚轴伸长。此外，我们发现PIFs和ARF 18都直接抑制qua-quine淀粉（QQS），这控制了碳和氮的分配。遮荫抑制的QS减弱了淀粉向蛋白质的转化，从而减少了叶面积。我们的研究结果表明，PIF依赖的基因调控协调多种SAS响应，包括通过ARF 18改变茎生长，以及通过QQS改变叶生长和代谢。
Shade avoidance syndrome (SAS) arises in densely growing plants that compete for light. InArabidopsis thaliana, phytochrome interacting factor (PIF) proteins link the perception of shade to stem elongation via auxin production. Here, we report that PIFs inhibit the shade-induced expression of AUXIN RESPONSE FACTOR 18 (ARF18), and ARF18 represses auxin signaling. Therefore, PIF-mediated inhibition ofARF18enhances auxin-dependent hypocotyl elongation in simulated shade. Furthermore, we show that both PIFs and ARF18 directly repress qua-quine starch (QQS), which controls the allocation of carbon and nitrogen. Shade-repressedQQSattenuates the conversion of starch to protein and thus reduced leaf area. Our results suggest that PIF-dependent gene regulation coordinates multiple SAS responses, including altered stem growth via ARF18, as well as altered leaf growth and metabolism via QQS.