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Front Plant Sci. 2016 Dec 15;7:1853. doi: 10.3389/fpls.2016.01853. eCollection 2016.

Regulatory Role of OsMADS34 in the Determination of Glumes Fate, Grain Yield, and Quality in Rice.

Author information

1
State Key Laboratory of Rice Biology, China National Rice Research Institute Zhejiang, China.
2
State Key Laboratory of Rice Biology, China National Rice Research InstituteZhejiang, China; College of Chemistry and Life Sciences, Zhejiang Normal UniversityZhejiang, China.
3
State Key Laboratory of Rice Biology, China National Rice Research InstituteZhejiang, China; College of Life and Environmental Sciences, Hangzhou Normal UniversityZhejiang, China.
4
College of Life and Environmental Sciences, Hangzhou Normal University Zhejiang, China.

Abstract

Grasses produce seeds on spikelets, a unique type of inflorescence. Despite the importance of grass crops for food, the genetic mechanisms that control spikelet development remain poorly understood. In this study, we used m34-z, a new mutant allele of the rice (Oryza sativa) E-class gene OsMADS34, to examine OsMADS34 function in determining the identities of glumes (rudimentary glume and sterile lemma) and grain size. In the m34-z mutant, both the rudimentary glume and sterile lemma were homeotically converted to the lemma-like organ and acquired the lemma identity, suggesting that OsMADS34 plays important roles in the development of glumes. In the m34-z mutant, most of the grains from the secondary panicle branches (spb) were decreased in size, compared with grains from wild-type, but no differences were observed in the grains from the primary panicle branches. The amylose content and gel consistency, and a seed-setting rate from the spb were reduced in the m34-z mutant. Interesting, transcriptional activity analysis revealed that OsMADS34 protein was a transcription repressor and it may influence grain yield by suppressing the expressions of BG1, GW8, GW2, and GL7 in the m34-z mutant. These findings revealed that OsMADS34 largely affects grain yield by affecting the size of grains from the secondary branches.

KEYWORDS:

OsMADS34; grain size; rice (Oryza sativa L.); rudimentary glume; spikelet; sterile lemma; transcriptional repressor

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