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The Asymmetric Expression of SAUR Genes Mediated by ARF7/19 Promotes the Gravitropism and Phototropism of Plant Hypocotyls

39 Pages Posted: 9 Jun 2019 Sneak Peek Status: Review Complete

See all articles by Xiaoyi Wang

Xiaoyi Wang

Peking University - State Key Laboratory of Protein and Plant Gene Research

Renbo Yu

Peking University - State Key Laboratory of Protein and Plant Gene Research

Jiajun Wang

Peking University - State Key Laboratory of Protein and Plant Gene Research

Zechuan Lin

Peking University - State Key Laboratory of Protein and Plant Gene Research

Zhaoguo Deng

Peking University - State Key Laboratory of Protein and Plant Gene Research

Hang He

Peking University - State Key Laboratory of Protein and Plant Gene Research

Liumin Fan

Peking University - State Key Laboratory of Protein and Plant Gene Research

Xing Wang Deng

Peking University - State Key Laboratory of Protein and Plant Gene Research

Haodong Chen

Peking University - State Key Laboratory of Protein and Plant Gene Research

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Abstract

Gravitropism and phototropism are important for sessile plants to adapt to various environments, and the asymmetric distribution of auxin leads to the bending growth of hypocotyls during these tropic responses. However, the signaling events downstream of auxin that direct the bending growth remain unclear. Here, we observe asymmetric expression of Arabidopsis SAUR19 subfamily genes during gravitropic and phototropic responses induced by lateral redistribution of auxin. Ectopic expression of SAUR19 weakened these tropic responses, indicating that the asymmetric expression of SAUR19 subfamily genes is critical for hypocotyl bending. The auxin responsive transcription factor ARF7 may directly bind the AuxRE element of the SAUR19 promoter and activate SAUR19 expression. Furthermore, over-expression of SAUR19 under its own promoter rescues the impaired gravitropic and phototropic responses of the arf7 arf19 double mutant. Taken together, our results reveal that gravity- or light-triggered asymmetric auxin distribution induces asymmetric expression of SAUR19 subfamily genes via ARF7 and ARF19 in the hypocotyls, which leads to bending growth during gravitropic and phototropic responses.

Keywords: gravitropism, phototropism, SAUR, ARF, auxin

Suggested Citation

Wang, Xiaoyi and Yu, Renbo and Wang, Jiajun and Lin, Zechuan and Deng, Zhaoguo and He, Hang and Fan, Liumin and Deng, Xing Wang and Chen, Haodong, The Asymmetric Expression of SAUR Genes Mediated by ARF7/19 Promotes the Gravitropism and Phototropism of Plant Hypocotyls (June 7, 2019). Available at SSRN: https://ssrn.com/abstract=3400859 or http://dx.doi.org/10.2139/ssrn.3400859
This is a paper under consideration at Cell Press and has not been peer-reviewed.

Xiaoyi Wang

Peking University - State Key Laboratory of Protein and Plant Gene Research

Haidian District, Beijing Summer Palace Road No. 5
Golden Life Sciences Building
Beijing, 100871
China

Renbo Yu

Peking University - State Key Laboratory of Protein and Plant Gene Research

Haidian District, Beijing Summer Palace Road No. 5
Golden Life Sciences Building
Beijing, 100871
China

Jiajun Wang

Peking University - State Key Laboratory of Protein and Plant Gene Research

Haidian District, Beijing Summer Palace Road No. 5
Golden Life Sciences Building
Beijing, 100871
China

Zechuan Lin

Peking University - State Key Laboratory of Protein and Plant Gene Research

Haidian District, Beijing Summer Palace Road No. 5
Golden Life Sciences Building
Beijing, 100871
China

Zhaoguo Deng

Peking University - State Key Laboratory of Protein and Plant Gene Research

Haidian District, Beijing Summer Palace Road No. 5
Golden Life Sciences Building
Beijing, 100871
China

Hang He

Peking University - State Key Laboratory of Protein and Plant Gene Research

Haidian District, Beijing Summer Palace Road No. 5
Golden Life Sciences Building
Beijing, 100871
China

Liumin Fan

Peking University - State Key Laboratory of Protein and Plant Gene Research

Haidian District, Beijing Summer Palace Road No. 5
Golden Life Sciences Building
Beijing, 100871
China

Xing Wang Deng

Peking University - State Key Laboratory of Protein and Plant Gene Research

Haidian District, Beijing Summer Palace Road No. 5
Golden Life Sciences Building
Beijing, 100871
China

Haodong Chen (Contact Author)

Peking University - State Key Laboratory of Protein and Plant Gene Research ( email )

Haidian District, Beijing Summer Palace Road No. 5
Golden Life Sciences Building
Beijing, 100871
China

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