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GrainGenes Gene Class Report: Basal sterility in speltoids

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Gene Class	Basal sterility in speltoids
Reference	Frankel OH and Roskams M (1975) Stability of floral differentiation in Triticum. Proceedings of the Royal Society of London, B 188:139-162. Frankel OH et al. (1969) The genetic basis of an invariant character in wheat. Heredity 24:571-591.
Abbreviation	Bs
Character affected	Fertility
Comment	The presence of the allele Q insures the fertility of the first and subsequent florets in wheat spikelets (260). In speltoids lacking Q, the fertility of the second and subsequent florets is insured by the dominant allele Bs (designated 'A' in reference 260), which is located in chromosome 5D (259). In the presence of Bs, the fertility of the first floret is under polygenic control. In bsbs speltoids, floret development is under polygenic control, and stocks with varying levels of basal fertility have been isolated. All group vulgare genotypes so far studied carry Bs. Basal-sterility scores were described for group vulgare and for speltoids in reference 260 as Group vulgare, all stocks, genotype QQ BsBs, score 0.00; and Speltoids, StFF stock, genotype qq BsBs, score 0.00; StF stock, genotype qq BsBs, score 0.08; St1A stock, genotype qq BsBs, score 0.39; St1 stock, genotype qq BsBs, score 0.96; St2 stock, genotype qq bsbs, score 1.41.
Wheat Gene Catalog Reference	259 Frankel OH and Roskams M (1975) Stability of floral differentiation in Triticum. Proceedings of the Royal Society of London, B 188:139-162. 260 Frankel OH et al. (1969) The genetic basis of an invariant character in wheat. Heredity 24:571-591.

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