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The Journal of Heredity 2000:91(4)
© 2000 The American Genetic Association 91:304-306

Epistatic interaction between vernalization genes Vrn-Am1 and Vrn-Am2 in diploid wheat

G Tranquilli1,2, and J Dubcovsky1,*

1Department of Agronomy and Range Sciences, University of California, Davis, CA 95616-8515, USA 2Present address: Instituto de Recursos Biologicos, INTA, Buenos Aires, Argentina *Corresponding author E-mail: jdubcovsky@ucdavis.edu

Genes Vrn-Am1 and Vrn-Am2 control the vernalization requirement in diploid wheat (Triticum monoccum. The epistatic interaction between these two genes on flowering date was studied here using a factorial analysis of variance. One hundred and two F2 plants were classified according to their genotypes for molecular markers tightly linked to Vrn-Am1 and Vrn-Am2. Mean comparisons showed that the Vrn-Am2 allele for winter growth habit was dominant to the vrn-Am2 allele for spring growth habit and that the Vrn-Am1 allele for spring growth habit was dominant to the vrn-Am1 allele for winter growth habit. A significant interaction was found between these two genes, suggesting that they work in the same developmental pathway. Plants homozygous for the recessive vrn-Am2 allele for spring growth habit flowered earlier than plants from the Vrn-Am2 class independently of the alleles present at Vrn-Am1. However, differences in heading data between plants with the Vrn-Am1 allele and those with the vrn-Am1 allele were significant only when the dominant Vrn-Am2 allele was present. A genetic model for the action of these two vernalization genes is proposed in which the role of Vrn-Am1 is to counteract the Vrn-Am2-mediated delay of flowering.


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