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GrainGenes Reference Report: JJB-30-1

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Reference	JJB-30-1
Title	Gene analysis of the degree of vernalisation requirement in winter wheat.
Journal	Japanese Journal of Breeding
Year	1980
Volume	30
Pages	1-10
Author	Gotoh T
Type	Article
Abstract	Through genetic studies of the vernalization requirements of winter wheats, it was made clear that the varietal differences of vernalization requirements in winter wheat are generally controlled by alleles of major genes which have mainly an additive effect. Two such genes were discovered to be involved in the expression of the varietal differences of the vernalization requirements of winter wheat. The gene tentatively named Aa is responsible for the difference in the vernalization requirements between cultivars with 20 days requirement and cultivars with 40 days requirement. A low level of vernalization requirement is incompletely dominant over a high level of requirement. The Bb gene is responsible for the difference between a vernalization requirement of 40 days and that of 60 days, where a low level of requirement is dominant over a high level of requirement, although the dominance effect is weaker than the former case. Because of the experimental procedure, the allelic relation between Aa and Bb is unknown at present. In addition, the allelic relation of these alleles to the Vrn genes is a matter of future investigation. Besides major genes, minor genes were found to be responsible for the varietal differences in vernalization requirement. Namely, the difference between Akasabi Shirazu 1, which has a vernalization requirement of 60 days, and cultivars with a vernalization requirement of 40 days was found to be attributable to the cumulative effect of minor genes.
External Databases	DOI: 10.1270/jsbbs1951.30.1
Gene Class	Response to vernalization (Triticum)
Cited in	McIntosh RA et al. (1995) Catalogue of gene symbols for wheat. Proceedings of the 8th International Wheat Genetics Symposium 1333-1500.

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