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Expression of vernalization genes in near isogenic wheat lines duration of vernalization period


Annals of Botany (London) 46(2): 235-242
Expression of vernalization genes in near isogenic wheat lines duration of vernalization period
Vernalization periods ranging from 0-11 wk at 4.degree. C were used to study the reproductive development of 4 near-isogenic lines of wheat (Triticum aestivum L. em. Thell). From the results for days to anthesis 2 types of gene action were identified, a threshold (all-or-nothing) response (vrn3 and/or vrn4) and a cumulative (graded) response (vrn1). The action of another gene (vrn2) intensified these 2 responses. Based on the action of genes, a model relating days to anthesis to genotype was derived. Final leaf number and days to anthesis were shown to be closely related after adjusting for differences due to the duration of vernalization treatment. No relationship between days to anthesis and spikelet number was observed. This study emphasizes the need to understand vernalization at the level of the gene in terms of responses and interactions. Such knowledge should enable the plant breeder to predict and more precisely control reproductive development.


Accession: 005432408



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