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Related Experiment Video

Updated: Jan 19, 2026

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VRN1-ratio test for polyploid wheat.

Alexandr Muterko1, Elena Salina2

  • 1The Federal Research Center Institute of Cytology and Genetics, Lavrentyeva Avenue 10, Novosibirsk, 630090, Russian Federation. muterko@gmail.com.

Planta
|September 19, 2019
PubMed
Summary

New insights into wheat genetics reveal duplications in dominant Vrn-A1 alleles and the VRN-B1 gene. These findings offer novel strategies for manipulating flowering time in wheat breeding.

Keywords:
Copy-number variationFlowering timeGenetic diversityVernalizationWheat

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Area of Science:

  • Plant genetics
  • Crop science
  • Molecular biology

Background:

  • Flowering time is a critical trait for wheat breeding, primarily influenced by VRN1 alleles.
  • Previous research identified multiplication of the recessive vrn-A1 allele in winter hexaploid wheat.
  • Understanding VRN1 gene copy-number variation is essential for crop improvement.

Purpose of the Study:

  • To investigate VRN1 gene copy-number variation in diverse wheat species.
  • To analyze copy number of VRN-A1 with alternative exon 4 haplotypes.
  • To identify new sources of polymorphism in agronomically important wheat genes.

Main Methods:

  • Optimization of ratio tests using end-point PCR fragment quantification.
  • Verification of results with quantitative PCR (qPCR) assays.
  • Investigation of DNA template fragmentation for accurate VRN1 copy number quantification.

Main Results:

  • Dominant Vrn-A1 alleles are frequently duplicated in hexaploid wheat.
  • VRN-A1 duplication was associated with awnless spikes.
  • Duplication of the VRN-B1 gene was identified for the first time in specific hexaploid wheat species.

Conclusions:

  • Duplications of Vrn-A1 alleles and VRN-B1 represent novel genetic polymorphisms in wheat.
  • These findings enhance understanding of VRN1 gene diversity.
  • The study provides new avenues for manipulating flowering time in wheat.