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Redundant Glycerol-3-Phosphate Acyltransferases Regulate Thermo-Sensitive Genic Male Sterility in Rice.

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Summary

A new study identifies a glycerol-3-phosphate acyltransferase 6.1 (OsGPAT6.1) gene mutation causing thermo-sensitive genic male sterility (TGMS) in rice. This discovery provides valuable TGMS germplasm for hybrid rice breeding by disrupting lipid metabolism.

Keywords:
GPATTGMShybrid breedinglipid metabolismrice

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Area of Science:

  • Plant genetics and breeding
  • Molecular biology
  • Agricultural science

Background:

  • Thermo-sensitive genic male sterility (TGMS) is crucial for two-line hybrid rice breeding.
  • Limited availability of elite TGMS germplasm and poorly understood molecular mechanisms hinder progress.

Purpose of the Study:

  • Identify novel TGMS lines and elucidate the molecular basis of fertility transition.
  • Develop stable TGMS germplasm for efficient hybrid rice breeding.

Main Methods:

  • Map-based cloning to identify the causative gene in a novel TGMS line (Osgpat6.1).
  • Cytological observation of tapetum development and programmed cell death (PCD).
  • Lipidomic profiling to analyze lipid metabolism perturbations.
  • Genetic analysis of gene homologues and functional complementation.

Main Results:

  • A premature termination mutation in OsGPAT6.1 causes TGMS by disrupting tapetal PCD and pollen exine formation under high temperatures.
  • OsGPAT6.1 disruption perturbs glycerolipid metabolism during pollen development.
  • Functional redundancy with OsGPAT6.2 and OsGPAT6.3 restores fertility under low temperatures.
  • Introgression of the Osgpat6.1 allele into diverse cultivars yields stable TGMS lines without affecting hybrid vigor.

Conclusions:

  • OsGPAT6.1 dysfunction confers TGMS in rice by disrupting glycerolipid metabolism.
  • This study provides valuable TGMS germplasm, facilitating two-line hybrid rice breeding.