RESISTANCE TO SHARKA TRAIT IN A FAMILY FROM SELFPOLLINATION OF ´LITO´ APRICOT CULTIVAR

In 1993, an apricot breeding program was initiated at IVIA, based on crosses between North American cultivars resistant to PPV-D and native cultivars susceptible to the virus.
An efficient procedure that allowed to determine the PPV resistance in the progenies was addressed.
In order to clarify the inheritance of the trait, a progeny of 81 individuals from a self-pollination of ‘Lito’, a cultivar resistant to Sharka, was screened for the trait.
Seedlings from this progeny were classified according to the trait, resulting in a segregation of 31: 50 susceptible/resistant to PPV. A Chi-square test indicated that segregation adjusted to the hypothesis of two independent dominant loci which the ratio would be 7/16 : 9/16 susceptible/resistant. ‘Lito’ cultivar would be heterozygous for both loci.
Only those seedlings homozygous or heterozygous for both loci, as the parent, would be resistant.
These results agree with previous studies of families between resistant versus susceptible.
A larger progeny from this family with 200 additional seedlings is being screened to confirm the hypothesis of inheritance of the trait.

XII International Symposium on Apricot Culture and Decline

M.L. Badenes, T.A. Moustafa, J. Martinez-Calvo, G. Llacer

Prunus armeniaca, plum pox virus, inheritance

https://doi.org/10.17660/ActaHortic.2006.701.63