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Preharvest Sprouting in Quinoa: A New Screening Method Adapted to Panicles and GWAS Components.

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Summary

Preharvest sprouting (PHS) in quinoa is a major challenge for farmers. This study adapted cereal screening methods to identify quinoa varieties with natural tolerance to PHS, crucial for breeding programs.

Keywords:
PHS screeninggenome-wide association study (GWAS)panicle-wetting testseed dormancy

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Area of Science:

  • Agricultural Science
  • Plant Breeding
  • Genetics

Background:

  • Quinoa cultivation is expanding globally, necessitating adaptation to diverse environments.
  • Preharvest sprouting (PHS) is a significant obstacle in coastal Pacific Northwest quinoa production, impacting yield and quality.
  • Limited research exists on PHS in quinoa compared to major cereal grains.

Purpose of the Study:

  • To investigate and understand preharvest sprouting (PHS) in quinoa.
  • To adapt and develop a screening method for quantifying PHS in quinoa.
  • To identify sources of natural PHS tolerance within quinoa germplasm.

Main Methods:

  • Adapted cereal PHS screening methods, including panicle-wetting tests.
  • Developed a specific scoring scale for quantifying quinoa panicle sprouting.
  • Phenotyped a diversity panel (N=336) and conducted a Genome-Wide Association Study (GWAS, n=279).

Main Results:

  • PHS was observed to varying degrees across the tested quinoa germplasm.
  • The study successfully quantified PHS tolerance using the developed screening method.
  • Identified natural sources of PHS tolerance within the quinoa diversity panel.

Conclusions:

  • PHS tolerance can be accessed from natural sources within quinoa germplasm.
  • The developed screening method is effective for assessing PHS in quinoa.
  • Identified tolerant genotypes can serve as valuable parental lines for future breeding efforts to enhance PHS resistance.