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qGL3.4 controls kernel size and plant architecture in rice.

Zhen-Wu Zheng1,2, Hong-Yuan Zhao1,2, Xiao-Ya Liang1,2

  • 1Guangdong Provincial Key Laboratory of Plant Molecular Breeding, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou 510642, China.

Yi Chuan = Hereditas
|September 21, 2023
PubMed
Summary

Researchers identified a novel quantitative trait locus (QTL), qGL3.4, in rice that significantly enhances kernel size and plant architecture, leading to improved yield potential. This discovery offers a promising avenue for developing higher-yielding rice varieties.

Keywords:
kernel sizeplant architecturericesingle segment substitution line

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Area of Science:

  • Plant genetics and breeding
  • Agricultural science
  • Molecular biology

Background:

  • Kernel size and plant architecture are critical determinants of rice yield.
  • Understanding the genetic basis of these traits is essential for developing high-yielding rice cultivars.
  • Previous research has focused on identifying genes controlling these agronomic traits.

Purpose of the Study:

  • To identify and characterize novel quantitative trait loci (QTLs) influencing kernel size and plant architecture in rice.
  • To provide genetic resources for breeding high-yield rice varieties.
  • To elucidate the genetic mechanisms underlying kernel development and plant structure.

Main Methods:

  • Development and analysis of single-segment substitution lines using Oryza barthii and an indica cultivar Huajingxian74 (HJX74).
  • Identification and fine-mapping of the novel QTL, qGL3.4, on chromosome 3.
  • Cellular analysis to investigate the effect of qGL3.4 on kernel size regulation.
  • Gene expression analysis of candidate genes involved in kernel development.

Main Results:

  • A novel QTL, qGL3.4, was identified, controlling kernel size and plant architecture.
  • Near isogenic line-qGL3.4 (NIL-qGL3.4) exhibited increased kernel length, width, 1000-kernel weight, panicle length, kernels per plant, primary branches, yield per plant, and plant height compared to HJX74.
  • qGL3.4 was mapped to a 239.18 kb interval on chromosome 3 and regulates kernel size by affecting cell growth.
  • qGL3.4 influences the transcription levels of key genes including EXPANSINS, GS3, GL3.1, PGL1, GL7, OsSPL13, and GS5.

Conclusions:

  • The identified qGL3.4 is a valuable genetic resource for enhancing rice kernel yield and improving plant architecture.
  • qGL3.4's role in regulating cell growth and transcription of key developmental genes provides insights into rice yield improvement.
  • This QTL holds significant potential for application in marker-assisted selection for breeding superior rice varieties.