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. 2020 Oct;228(2):609-621.
doi: 10.1111/nph.16732. Epub 2020 Jul 16.

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

Yuebin Jia  1   2 , Xiangpei Kong  1 , Kongqin Hu  1 , Mengqiang Cao  1 , Jiajia Liu  1 , Changle Ma  2 , Siyi Guo  3 , Xianzheng Yuan  4 , Shan Zhao  4 , Hélène S Robert  5 , Cuiling Li  1 , Huiyu Tian  1 , Zhaojun Ding  1
Affiliations
Free article

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

Yuebin Jia et al. New Phytol. 2020 Oct.
Free article

Erratum in

  • Corrigendum.
    Jia Y, Kong X, Hu K, Cao M, Liu J, Ma C, Guo S, Yuan X, Zhao S, Robert HS, Li C, Tian H, Ding Z. Jia Y, et al. New Phytol. 2023 Jun;238(5):2251-2252. doi: 10.1111/nph.18884. Epub 2023 Apr 9. New Phytol. 2023. PMID: 37031368 No abstract available.

Abstract

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.

Keywords: ARF18; auxin; phytochrome interacting factors (PIFs); qua-quine starch (QQS); shade avoidance.

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