INVESTIGADORES
CAVAGNARO Pablo Federico
congresos y reuniones científicas
Título:
Digenic control of vernalization requirement in carrot (Daucus carota L.)
Autor/es:
WOHLFEILER, J.; ALESSANDRO, M. S.; GALMARINI, C. R.; CAVAGNARO, P. F.
Lugar:
Cracovia
Reunión:
Conferencia; Carrot and Other Apiaceae Conference - 2nd International Symposium; 2018
Institución organizadora:
International Society for Horticultural Science (ISHS)
Resumen:
Wild carrots are typically classified as annual, and cultivated varieties, as biennial. In order to induce flowering this species requires vernalization, and the dissimilar responses to vernalization are consequence of the type of cultivar: biennial cultivars require more hours of exposure to cold than annuals. After vernalization period and subsequent long days, floral stem elongation and flowering take place. Previous studies with F2 and BC1 families, derived from crosses between an early-cultivar and a late-flowering line concluded that annual habit is dominant over biennial and is a monogenic character. The objective of this research was to determine the genetic bases of vernalization requirement within segregant populations of carrot from different gene pools and wide ranging origins. We analyzed F2 populations coming from nine crosses between biennial and annual phenotypes from different origins: B5 x Criolla, B5 x T88, B6 x Criolla, B6 x Brasilia, B6 x T60, Kuroda x Criolla, Kuroda x Brasilia, Kuroda x T60 and Kuroda x T88. Kuroda from Japan, B5 and B6 from EEUU were used as biennial phenotypes; and Criolla INTA from Argentina, Brasilia from Brazil, T60 and T88 both from Turkey, were the annual phenotypes. During two years, F2 populations were sown in the fall in order to discriminate annual and biennial behavior at La Consulta, Mendoza, Argentina. Percentage of flowered plants was evaluated in both years for all the segregating progenies. Chi square test was used to evaluate the possible genetic models. The results adjust to a model of two genes (Vrn-A and Vrn-B) with three alleles controlling the vernalization requirement. Dominance of annuality was clear in both genes. Vrn-A is crucial to define the phenotype having a major effect over Vrn-B.
