PIFs coordinate shade avoidance by inhibiting auxin repressor ARF18 and metabolic regulator QQS

New Phytologist - Tập 228 Số 2 - Trang 609-621 - 2020
Yuebin Jia1,2,3, Xiangpei Kong2,3, Kongqin Hu2, Mengqiang Cao2, Jiajia Liu2, Changle Ma1, Siyi Guo4, Xian-Zheng Yuan5, Shan Zhao5, Hélène S. Robert6, Cuiling Li2, Huiyu Tian2, Zhaojun Ding2
1Shandong Provincial Key Laboratory of Plant Stress, College of life Sciences, Shandong Normal University, Jinan, Shandong 250014, China
2The Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, College of Life Sciences, Shandong University, Qingdao, Shandong 266237, China
3these authors contributed equally to this work
4The key Laboratory of Plant Stress Biology, School of Life Science, Henan University, Kaifeng, 475004 China
5Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong, 266237, China
6Mendel Centre for Genomics and Proteomics of Plants Systems CEITEC MU – Central European Institute of Technology Masaryk University Brno 004205 Czech Republic

Tóm tắt

Summary Shade avoidance syndrome (SAS) arises in densely growing plants that compete for light. In Arabidopsis 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 of ARF18 enhances 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‐repressed QQS attenuates 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.

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New Phytologist

Tập 228 Số 2

609-621

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