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Semi-Rolled Leaf2 modulates rice leaf rolling by regulating abaxial side cell differentiation.

Xiaofei Liu1, Ming Li2, Kai Liu3

  • 1State Key Laboratory of Plant Genomics and Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.

Journal of Experimental Botany
|February 14, 2016
PubMed
Summary

A novel gene, semi-rolled leaf2 (SRL2), regulates rice leaf development by controlling sclerenchymatous cell differentiation. Mutations in SRL2 lead to incurved leaves and altered plant architecture.

Keywords:
Abaxial sideSRL2.cell differentiationleaf developmentleaf rollingrice

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Area of Science:

  • Plant Biology
  • Genetics
  • Developmental Biology

Background:

  • Leaf rolling is crucial for optimal plant architecture, influencing light capture and minimizing self-shading.
  • Understanding the genetic mechanisms controlling leaf morphology is essential for crop improvement.

Purpose of the Study:

  • To identify and characterize novel genes involved in rice leaf development.
  • To elucidate the function of the semi-rolled leaf2 (SRL2) gene in regulating leaf morphology and plant architecture.

Main Methods:

  • Map-based cloning was employed to identify the gene responsible for the semi-rolled leaf phenotype.
  • SRL2 gene expression patterns were analyzed in various rice tissues.
  • Double mutant analysis was performed to investigate the genetic interactions between SRL2 and other leaf development genes.

Main Results:

  • A novel rice mutant, semi-rolled leaf2 (srl2), exhibiting incurved, narrow leaves and reduced plant height was identified.
  • Map-based cloning revealed that SRL2 encodes a plant-specific protein crucial for sclerenchymatous cell development on the abaxial leaf side.
  • SRL2 expression is localized in vascular bundles and sclerenchymatous cells of leaves and roots, and its mutation affects YABBY gene expression.
  • SRL2 functions independently of the SHALLOT-LIKE1 (SLL1)/ROLLED LEAF9 (RL9) pathway in regulating abaxial leaf development.

Conclusions:

  • SRL2 is a key regulator of rice leaf development, particularly influencing sclerenchymatous cell differentiation and leaf morphology.
  • The srl2 mutation results in abnormal leaf development, impacting plant architecture.
  • SRL2 represents a novel target for genetic manipulation to improve rice plant architecture and potentially yield.