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Rice EMF3 Alleles Adjust Flower Opening Time to Enhance the Seed Setting Rate Under High Temperature Stress.

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Summary

Scientists identified the EARLY-MORNING FLOWERING 3 (EMF3) gene, which controls flower opening time in rice. Modifying EMF3 improves seed setting rates under heat stress, crucial for global food security.

Keywords:
EARLY‐MORNING FLOWERING 3flower opening timeheat stressriceseed setting rate

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Area of Science:

  • Plant Biology
  • Genetics
  • Agricultural Science

Background:

  • Global food security is threatened by population growth and climate change, necessitating genetic improvement in crops like rice.
  • Flower opening time (FOT) is a critical factor influencing seed set rates in cereals.
  • Understanding the genetic control of FOT is essential for developing climate-resilient crop varieties.

Purpose of the Study:

  • To identify genes controlling flower opening time (FOT) in rice.
  • To investigate the function of the identified gene in flowering and fertilization.
  • To explore the potential of manipulating this gene for crop improvement under environmental stress.

Main Methods:

  • Gene identification through genetic variation analysis in rice (Oryza sativa).
  • Functional characterization using knock-out mutants and phenotypic analysis.
  • Gene expression analysis (transcriptomics) in anthers and lodicules.
  • Allele modification and introgression into different rice varieties and species.

Main Results:

  • Identified EARLY-MORNING FLOWERING 3 (EMF3) as a key regulator of FOT, with semi-dominant single-nucleotide substitutions causing significant FOT variation.
  • EMF3 knock-out mutants exhibited disrupted FOT synchrony and anther dehiscence, leading to fertilization failure.
  • EMF3 encodes a plasma membrane protein specifically expressed in anthers, impacting anther and lodicule transcriptomes.
  • EMF3 allele modification allowed FOT adjustment across Oryza species and improved seed set rates under heat stress by enabling earlier flowering in cooler temperatures.

Conclusions:

  • EMF3 is a novel gene controlling anther-mediated flower opening time in rice.
  • EMF3 alleles can be utilized in breeding strategies to enhance fertilization efficiency, increase hybrid rice seed production, and mitigate heat stress impacts.
  • This discovery offers a valuable tool for genetic improvement of cereals to ensure future food security.