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Florigen repression complexes involving rice CENTRORADIALIS2 regulate grain size.

Ying He1, Liuyu Li1, Weibiao Shi1

  • 1State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China.

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Summary
This summary is machine-generated.

Rice OsCEN2 negatively controls grain size by restricting cell expansion. Knocking out OsCEN2 increases grain size, revealing a new regulatory module for improving rice yield.

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Area of Science:

  • Plant genetics
  • Molecular biology
  • Agricultural science

Background:

  • Grain size is a key determinant of rice yield.
  • Genetic mechanisms controlling rice grain size are not fully understood.
  • Florigen repression complexes (FRCs) role in grain size regulation is largely unknown.

Purpose of the Study:

  • To elucidate the genetic and molecular mechanisms of FRCs in controlling rice grain size.
  • To identify key genes and their interactions regulating grain size in rice.
  • To explore strategies for enhancing rice seed size and weight.

Main Methods:

  • Gene overexpression and knockout in rice (Oryza sativa L.).
  • Yeast two-hybrid and bimolecular fluorescence complementation assays for protein interactions.
  • Analysis of cell expansion and division in spikelet hull and seed filling.

Main Results:

  • OsCEN2, a PEBP family protein, negatively regulates rice grain size.
  • OsCEN2 overexpression reduces grain size; OsCEN2 knockout increases grain size.
  • OsCEN2 interacts with GF14f, which interacts with OsFD2, forming a regulatory module controlling cell expansion and seed filling.

Conclusions:

  • The OsCEN2-GF14f-OsFD2 module provides novel insights into FRC function in rice.
  • Understanding this regulatory pathway offers a strategy for improving rice seed size and yield.
  • This study deepens the knowledge of molecular mechanisms governing plant architecture and crop productivity.