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.
journal_name
Cell Repjournal_title
Cell reportsauthors
Wang X,Yu R,Wang J,Lin Z,Han X,Deng Z,Fan L,He H,Deng XW,Chen Hdoi
10.1016/j.celrep.2020.107529subject
Has Abstractpub_date
2020-04-21 00:00:00pages
107529issue
3issn
2211-1247pii
S2211-1247(20)30429-0journal_volume
31pub_type
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