J Integr Plant Biol. ›› 2022, Vol. 64 ›› Issue (9): 1690-1705.DOI: 10.1111/jipb.13325

• Cell and Developmental Biology • Previous Articles     Next Articles

Genome-wide binding analysis of transcription factor Rice Indeterminate 1 reveals a complex network controlling rice floral transition

Shuo Zhang†*, Li Deng, Lun Zhao and Changyin Wu*   

  1. National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan 430070, China

    These authors contributed equally to this work.
    *Correspondences: Changyin Wu (cywu@mail.hzau.edu.cn, Dr. Wu is responsible for the distribution of the materials associated with this article); Shuo Zhang (zhangshuoformat@webmail.hzau.edu.cn)
  • Received:2022-04-19 Accepted:2022-07-05 Online:2022-07-05 Published:2022-09-01


RICE INDETERMINATE 1 (RID1) plays a critical role in controlling floral transition in rice (Oryza sativa). However, the molecular basis for this effect, particularly the target genes and regulatory specificity, remains largely unclear. Here, we performed chromatin immunoprecipitation followed by sequencing (ChIP-seq) in young leaves at the pre-floral-transition stage to identify the target genes of RID1, identifying 2,680 genes associated with RID1 binding sites genome-wide. RID1 binding peaks were highly enriched for TTTGTC, the direct binding motif of the INDETERMINATE DOMAIN protein family that includes RID1. Interestingly, CACGTG and GTGGGCCC, two previously uncharacterized indirect binding motifs, were enriched through the interactions of RID1 with the novel flowering-promoting proteins OsPIL12 and OsTCP11, respectively. Moreover, the ChIP-seq data demonstrated that RID1 bound to numerous rice heading-date genes, such as HEADING DATE 1 (HD1) and FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 (OsFKF1). Notably, transcriptome sequencing (RNA-seq) analysis revealed roles of RID1 in diverse developmental pathways. Genetic analysis combined with genome-wide ChIP-seq and RNA-seq results showed that RID1 directly binds to the promoter of OsERF#136 (a repressor of rice flowering) and negatively regulates its expression. Overall, our findings provide new insights into the molecular and genetic mechanisms underlying rice floral transition and characterize OsERF#136 as a previously unrecognized direct target of RID1.

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