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eQTLs Regulating Transcript Variations Associated with Rapid Internode Elongation in Deepwater Rice.

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Deepwater rice rapidly elongates internodes to survive flooding. This study identified gene regulatory networks, including SNORKEL genes, controlling this crucial adaptation, offering insights into crop evolution.

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Area of Science:

  • Genetics and Genomics
  • Plant Biology
  • Crop Science

Background:

  • Deepwater rice exhibits rapid internode elongation to survive submergence and avoid low oxygen.
  • Understanding the gene regulatory networks controlling this response is vital for crop adaptation to flooding.

Purpose of the Study:

  • To elucidate the genetic and molecular basis of the deepwater response in rice.
  • To identify key regulatory networks and genes involved in rapid internode elongation.

Main Methods:

  • Utilized microarrays and performed expression quantitative trait loci (eQTL) and phenotypic QTL (phQTL) analyses on recombinant inbred line (RIL) populations.
  • Analyzed internode samples from deepwater and non-deepwater rice varieties under submergence.
  • Employed bioinformatic analyses, including gene ontology and promoter enrichment analyses.

Main Results:

  • Identified 10,047 significant eQTLs, including 2,902 cis-eQTLs and 7,145 trans-eQTLs.
  • Discovered three eQTL hotspots on chromosomes 1, 4, and 12 regulating gene expression.
  • Found that SNORKEL1 and SNORKEL2 (SK1/2) partially regulate target genes, with independent downstream regulation from hotspots on chromosomes 1 and 4.
  • Observed over-representation of photosynthesis and light signaling categories in SK1/2 target genes.

Conclusions:

  • The study reveals new insights into the genetic architecture of gene expression controlling flooding response in deepwater rice.
  • Identified key regulatory points and pathways, including SK1/2-dependent and independent pathways, involved in rapid internode elongation.
  • Provides a valuable community resource for further research on the genetic basis of deepwater responses in rice.