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http://dx.doi.org/10.14348/molcells.2019.0141

Chromatin Interacting Factor OsVIL2 Is Required for Outgrowth of Axillary Buds in Rice  

Yoon, Jinmi (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
Cho, Lae-Hyeon (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
Lee, Sichul (Center for Plant Aging Research, Institute for Basic Science)
Pasriga, Richa (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
Tun, Win (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
Yang, Jungil (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
Yoon, Hyeryung (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
Jeong, Hee Joong (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
Jeon, Jong-Seong (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
An, Gynheung (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
Publication Information
Molecules and Cells / v.42, no.12, 2019 , pp. 858-868 More about this Journal
Abstract
Shoot branching is an essential agronomic trait that impacts on plant architecture and yield. Shoot branching is determined by two independent steps: axillary meristem formation and axillary bud outgrowth. Although several genes and regulatory mechanism have been studied with respect to shoot branching, the roles of chromatin-remodeling factors in the developmental process have not been reported in rice. We previously identified a chromatin-remodeling factor OsVIL2 that controls the trimethylation of histone H3 lysine 27 (H3K27me3) at target genes. In this study, we report that loss-of-function mutants in OsVIL2 showed a phenotype of reduced tiller number in rice. The reduction was due to a defect in axillary bud (tiller) outgrowth rather than axillary meristem initiation. Analysis of the expression patterns of the tiller-related genes revealed that expression of OsTB1, which is a negative regulator of bud outgrowth, was increased in osvil2 mutants. Chromatin immunoprecipitation assays showed that OsVIL2 binds to the promoter region of OsTB1 chromatin in wild-type rice, but the binding was not observed in osvil2 mutants. Tiller number of double mutant osvil2 ostb1 was similar to that of ostb1, suggesting that osvil2 is epistatic to ostb1. These observations indicate that OsVIL2 suppresses OsTB1 expression by chromatin modification, thereby inducing bud outgrowth.
Keywords
bud outgrowth; chromatin modification; rice;
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