| Title | The Asymmetric Expression of SAUR Genes Mediated by ARF7/19 Promotes the Gravitropism and Phototropism of Plant Hypocotyls |
| Authors | Wang, Xiaoyi Yu, Renbo Wang, Jiajun Lin, Zechuan Han, Xue Deng, Zhaoguo Fan, Liumin He, Hang Deng, Xing Wang Chen, Haodong |
| Affiliation | Peking Univ, State Key Lab Prot & Plant Gene Res, Sch Adv Agr Sci, Beijing 100871, Peoples R China Peking Univ, Sch Life Sci, Peking Tsinghua Ctr Life Sci, Beijing 100871, Peoples R China |
| Keywords | SMALL AUXIN DIFFERENTIAL GROWTH CELL EXPANSION BLUE-LIGHT ARABIDOPSIS ENCODES AUX/IAA PROTEIN FAMILY LOCUS |
| Issue Date | 21-Apr-2020 |
| Publisher | CELL REPORTS |
| Abstract | The asymmetric distribution of auxin leads to the bending growth of hypocotyls during gravitropic and phototropic responses, but the signaling events downstream of auxin remain unclear. Here, we identify many SAUR genes showing asymmetric expression in soybean hypocotyls during gravistimulation and then study their homologs in Arabidopsis. SAUR19 subfamily genes have asymmetric expression in Arabidopsis hypocotyls during gravitropic and phototropic responses, induced by the lateral redistribution of auxin. Both the mutation of SAUR19 subfamily genes and the ectopic expression of SAUR19 weaken these tropic responses, indicating the critical role of their asymmetric expression. The auxin-responsive transcription factor ARF7 may directly bind the SAUR19 promoter and activate SAUR19 expression asymmetrically in tropic responses. Taken together, our results reveal that a gravity- or light-triggered asymmetric auxin distribution induces the asymmetric expression of SAUR19 subfamily genes by ARF7 and ARF19 in the hypocotyls, which leads to bending growth during gravitropic and phototropic responses. |
| URI | http://hdl.handle.net/20.500.11897/588187 |
| ISSN | 2211-1247 |
| DOI | 10.1016/j.celrep.2020.107529 |
| Indexed | SCI(E) Scopus |
| Appears in Collections: | 现代农学院 生命科学学院 |
