Evidence map›Paper›PMID 26324889›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2015

Identification of the VERNALIZATION 4 gene reveals the origin of spring growth habit in ancient wheats from South Asia.

Nestor Kippes, Juan M Debernardi, Hans A Vasquez-Gross, Bala A Akpinar, Hikment Budak, Kenji Kato, Shiaoman Chao, Eduard Akhunov, Jorge Dubcovsky

Open access · bronzeAbstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 82 papers.

0numbers the graph read from it
0cells of the map it votes in
82citing papers in PubMed
24.8field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

82 citing papers in PubMed, 154 citations in OpenAlex.

  1. Review
  2. Structural and coding variation inbioRxiv : the preprint server for biology · 2026
    Article
  3. Combining promoter and induced intron 1 mutations ofMolecular breeding : new strategies in plant improvement · 2026
    Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Effects of five allelic variants of the wheat vernalization geneMolecular breeding : new strategies in plant improvement · 2025
    Article
  9. Article
  10. Review
  11. Article
  12. Article
  13. Ancient diversity ofFrontiers in plant science · 2025
    Article
  14. Article
  15. Article
  16. Article
  17. Review
  18. Article
  19. Article
  20. Article

22 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

9 authors at 5 institutions in 3 countries.

Nestor KippesDepartment of Plant Sciences, University of California, Davis, CA 95616;
Juan M DebernardiDepartment of Plant Sciences, University of California, Davis, CA 95616;
Hans A Vasquez-GrossDepartment of Plant Sciences, University of California, Davis, CA 95616;
Bala A AkpinarFaculty of Engineering and Natural Sciences, Sabanci University, Orhanli, Tuzla-Istanbul, 34956, Turkey;
Hikment BudakFaculty of Engineering and Natural Sciences, Sabanci University, Orhanli, Tuzla-Istanbul, 34956, Turkey;
Kenji KatoGraduate School of Environmental and Life Science, Okayama University, Okayama, 700-8530, Japan;
Shiaoman ChaoBiosciences Research Lab, US Department of Agriculture-Agricultural Research Service, Fargo, ND 58102;
Eduard AkhunovDepartment of Plant Pathology, Kansas State University, Manhattan, KS 66506;
Jorge DubcovskyDepartment of Plant Sciences, University of California, Davis, CA 95616; Howard Hughes Medical Institute, Chevy Chase, MD 20815 jdubcovsky@ucdavis.edu.
University of California, Davis · USSabancı Üniversitesi · TRAgricultural Research Service · USKansas State University · USOkayama University · JP

Funding

Howard Hughes Medical Institute
6 · The paper itself

Abstract

Wheat varieties with a winter growth habit require long exposures to low temperatures (vernalization) to accelerate flowering. Natural variation in four vernalization genes regulating this requirement has favored wheat adaptation to different environments. The first three genes (VRN1-VRN3) have been cloned and characterized before. Here we show that the fourth gene, VRN-D4, originated by the insertion of a ∼290-kb region from chromosome arm 5AL into the proximal region of chromosome arm 5DS. The inserted 5AL region includes a copy of VRN-A1 that carries distinctive mutations in its coding and regulatory regions. Three lines of evidence confirmed that this gene is VRN-D4: it cosegregated with VRN-D4 in a high-density mapping population; it was expressed earlier than other VRN1 genes in the absence of vernalization; and induced mutations in this gene resulted in delayed flowering. VRN-D4 was found in most accessions of the ancient subspecies Triticum aestivum ssp. sphaerococcum from South Asia. This subspecies showed a significant reduction of genetic diversity and increased genetic differentiation in the centromeric region of chromosome 5D, suggesting that VRN-D4 likely contributed to local adaptation and was favored by positive selection. Three adjacent SNPs in a regulatory region of the VRN-D4 first intron disrupt the binding of GLYCINE-RICH RNA-BINDING PROTEIN 2 (TaGRP2), a known repressor of VRN1 expression. The same SNPs were identified in VRN-A1 alleles previously associated with reduced vernalization requirement. These alleles can be used to modulate vernalization requirements and to develop wheat varieties better adapted to different or changing environments.

Indexed as

SeasonsAdaptation, PhysiologicalAsiaBase SequenceChromosomal Proteins, Non-HistoneGenetic VariationMolecular Sequence DataMutationPlant ProteinsPolymorphism, Single NucleotideRegulatory Sequences, Nucleic AcidSequence Analysis, DNASpecies SpecificityTriticumChromosomal Proteins, Non-HistonePlant ProteinsfloweringTriticum aestivum ssp. sphaerococcumvernalizationVRN1wheat

Identifiers

PMID26324889
PMCPMC4593092
OpenAlexW2171845197

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.