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Updated: Feb 8, 2026

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RSP Gene Encodes a MED Subunit 33a, Which Is Involved in the Regulation of PCD and Immune Responses.

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|February 7, 2026
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Summary

A new rice mutant, russet spots leaf (rsp), reveals that the RSP gene regulates both plant immunity and grain yield. This discovery aids in developing disease-resistant, high-yield rice varieties.

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MED subunitPCDlesion mimic mutantsresistancerice

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Area of Science:

  • Plant genetics and molecular biology
  • Crop science
  • Plant pathology

Background:

  • Lesion mimic mutants (LMMs) in rice are crucial for understanding plant immune responses.
  • Studying LMMs helps elucidate the mechanisms of plant defense against pathogens.

Purpose of the Study:

  • To identify and characterize a novel rice LMM with altered agronomic traits.
  • To determine the genetic basis of the observed phenotypes and their impact on plant defense and yield.

Main Methods:

  • Mutagenesis using ethyl methanesulfonate (EMS) and screening for LMMs.
  • Phenotypic analysis including photosynthetic efficiency, programmed cell death (PCD), and reactive oxygen species (ROS) accumulation.
  • Map-based cloning to identify the causative gene (RSP).
  • Analysis of defense-related genes and metabolites.

Main Results:

  • A novel LMM, rsp, was identified with spontaneous leaf russet spots, reduced grain yield, impaired photosynthesis, aberrant PCD, and excessive ROS.
  • The rsp mutant exhibited enhanced resistance to bacterial blight and rice stripe virus.
  • Map-based cloning identified RSP, encoding MED subunit 33a, with a single nucleotide substitution causing inactivation.
  • The mutation affected responses to abiotic stresses and hormones.

Conclusions:

  • RSP is a key regulator of rice immune responses and grain yield.
  • The rsp mutation provides insights into the trade-offs between disease resistance and yield.
  • Findings lay the groundwork for breeding improved rice cultivars with high yield, quality, and disease resistance.