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Evolutionary flexibility in flooding response circuitry in angiosperms.

Mauricio A Reynoso1, Kaisa Kajala2,3,4, Marko Bajic5,6

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Science (New York, N.Y.)
|October 12, 2019
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Summary
This summary is machine-generated.

Gene regulatory networks help plants survive flooding. This study analyzed chromatin accessibility and gene expression in four plants to find conserved genes and regulatory elements activated by submergence, revealing adaptive traits in wetland crops.

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Area of Science:

  • Plant biology
  • Genomics
  • Ecology

Background:

  • Extreme weather events like flooding pose significant threats to global crop production and natural ecosystems.
  • Understanding plant responses to submergence is crucial for developing resilient crops and conserving biodiversity.

Purpose of the Study:

  • To investigate the variation in gene regulatory networks activated by submergence across different plant species.
  • To identify conserved and species-specific mechanisms of gene regulation under flooding stress.

Main Methods:

  • High-resolution analysis of chromatin accessibility and gene expression.
  • Comparative genomics across four angiosperms with varying adaptations to water availability (dryland to wetland).
  • Analysis of cis-regulatory elements and transcription factor binding sites.

Main Results:

  • A conserved set of submergence-activated genes was identified, regulated by four transcription factor families.
  • Both syntenic and nonsyntenic genes showed cis motifs and chromatin accessibility linked to submergence response.
  • Regulatory circuitry for submergence response is conserved across eudicots and monocots.

Conclusions:

  • The frequency of specific cis motifs, chromatin accessibility, and the extent of submergence activation vary among species.
  • These variations, particularly in wetland crops, suggest adaptive importance for surviving inundation.
  • This research provides insights into the genetic basis of plant adaptation to flooding.