PARENTS FOR SPRING FROST TOLERANCE IN APRICOT
Apricot (Prunus armeniaca L.) is particularly sensitive to spring frosts, which can cause irreversible damage to the flower buds or to the just-set fruits. In order to evaluate if the differences in frost tolerance, observed under field conditions, could be confirmed, cold-stress tests under artificial sub-zero temperatures were conducted, eliminating the multiple variables of the field. The results showed a different degree of cold tolerance according to the genotype and the phenological stage. After the break of endo-dormancy and at the pre-flowering stage, when flower buds are generally more susceptible, some genotypes (Haggith, 11/48/2, 7C/20/3, 2/29/11) were hardy, not only at -4°C, but also at -8°C. The frost-hardy genotypes, identified in natural conditions by satisfactory yields, showed an elevated tolerance to freeze damage after artificial cold treatments too.
Guerriero, R., Viti, R., Bartolini, S. and Iacona, C. (2006). PARENTS FOR SPRING FROST TOLERANCE IN APRICOT. Acta Hortic. 717, 153-156
cold tolerance, flower bud, Prunus armeniaca L., breeding, selection