INVESTIGADORES
CAVAGNARO pablo Federico
artículos
Título:
Multiallelic digenic control of vernalization requirement in carrot (Daucus carota L.)
Autor/es:
WOHLFEILER, J.; ALESSANDRO, M. S.; CAVAGNARO, P. F.; GALMARINI, C. R.
Revista:
EUPHYTICA
Editorial:
SPRINGER
Referencias:
Año: 2019
ISSN:
0014-2336
Resumen:
Carrots are typically classified as annual or biennial, depending on their vernalization requirement for flowering, a trait that is genetically-conditioned. Wild carrots are predominantly annual, requiring less hours of cold temperatures for flower induction, whereas most cultivated carrots are biennal (i.e., they have higher cold temperature requirements). After vernalization, if followed by long days, floral stem elongation and flowering take place. Previous studies using F2 and BC1 families derived from crosses between an early and a late-flowering line revealed segregation ratios consistent with a monogenic character with annual habit being dominant over biennial. In this work, we studied inheritance and segregation of the vernalization requirement in carrot F2 populations derived from crosses involving carrots of different genetic backgrounds and geographical origins. Nine crosses between biennial and annual phenotypes were analyzed, for two years, by means of percentage of flowering plants (parental lines, F1 and F2 families were sawn in the fall for adequate discrimination between annual and biennial plants). Based on the obtained segregation ratios, genetic models for this trait were proposed. The results are consistent with a model of two genes (Vrn-A and Vrn-B) with three alleles controlling the vernalization requirement. Dominance of annuality was clear for both genes, with Vrn-A having a larger effect on phenotype than Vrn-B.