Osgras19 and Osgras32 Control Tiller Development in Rice

Jinwon Lee, Jinmi Yoon, Seulbi Lee, Gynheung An, Soon Ki Park

Research output: Contribution to journalArticlepeer-review

Abstract

Tiller development is an important agronomic trait in plant architecture and grain yield. Many plant hormones regulate axillary meristem formation, including bud outgrowth for shoot branching. However, the molecular mechanism underlying the brassinosteroid (BR) in tiller development is not yet well known. Therefore, in this study, we identified and characterized two novel T-DNA insertion mutants, osgras19 and osgras32, which showed the typical BR-deficient phenotype, such as fewer tiller numbers,dark-green leaves, and semi-dwarf phenotypes. Double knockout mutants, osgras19 osgras32, were then generated by crossing, and they showed similar phenotypic traits of each single mutant. Both OsGRAS19 and OsGRAS32 encoded the GRAS family proteins and were localized in the nucleus. We also confirmed that OsGRAS19 and OsGRAS32 did not directly interact with each other; however,OsGRAS19 interacted with MOC1 and SMALL ORGAN SIZE1 (SMOS1), an auxin-regulated APETALA2-type transcription factor, in yeast. Thus, we proposed OsGRAS19 as a component of the complex on the auxin-BR signaling pathway and plays role in the tiller development in rice.

Original languageEnglish
Pages (from-to)239-249
Number of pages11
JournalPlant Breeding and Biotechnology
Volume9
Issue number3
DOIs
StatePublished - 2021

Keywords

  • Oryza sativa
  • Osgras19
  • Osgras32
  • Rice
  • Tiller development

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