Abstract:
KEY MESSAGE:OsWRKY36 represses plant height and grain size by inhibiting gibberellin signaling. Plant height and grain size are important agronomic traits affecting yield in cereals, including rice. Gibberellins (GAs) are plant hormones that promote plant growth and developmental processions such as stem elongation and grain size. WRKYs are transcription factors that regulate stress tolerance and plant development including height and grain size. However, the relationship between GA signaling and WRKY genes is still poorly understood. Here, we characterized a small grain and semi-dwarf 3 (sgsd3) mutant in rice cv. Hwayoung (WT). A T-DNA insertion in the 5'-UTR of OsWRKY36 induced overexpression of OsWRKY36 in the sgsd3 mutant, likely leading to the mutant phenotype. This was confirmed by the finding that overexpression of OsWRKY36 caused a similar small grain and semi-dwarf phenotype to the sgsd3 mutant whereas knock down and knock out caused larger grain phenotypes. The sgsd3 mutant was also hyposensitive to GA and accumulated higher mRNA and protein levels of SLR1 (a GA signaling DELLA-like inhibitor) compared with the WT. Further assays showed that OsWRKY36 enhanced SLR1 transcription by directly binding to its promoter. In addition, we found that OsWRKY36 can protect SLR1 from GA-mediated degradation. We thus identified a new GA signaling repressor OsWRKY36 that represses GA signaling through stabilizing the expression of SLR1.
journal_name
Plant Mol Bioljournal_title
Plant molecular biologyauthors
Lan J,Lin Q,Zhou C,Ren Y,Liu X,Miao R,Jing R,Mou C,Nguyen T,Zhu X,Wang Q,Zhang X,Guo X,Liu S,Jiang L,Wan Jdoi
10.1007/s11103-020-01049-0subject
Has Abstractpub_date
2020-11-01 00:00:00pages
429-450issue
4-5eissn
0167-4412issn
1573-5028pii
10.1007/s11103-020-01049-0journal_volume
104pub_type
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