ISHS Acta Horticulturae 760: XXVII International Horticultural Congress - IHC2006: II International Symposium on Plant Genetic Resources of Horticultural Crops
RESISTANCE TO TAPHRINA DEFORMANS (BERK.) TUL. IN PEACHES AND NECTARINES IN SOUTHEASTERN ROMANIA |
| Authors: | M. Trandafirescu, E. Topor, G. Teodorescu |
| Keywords: | genetic resistance, peach leaf-curl, natural infection, Persica vulgaris |
| Abstract:
In Southeastern Romania, peach leaf-curl, caused by the fungus, Taphrina deformans, is observed frequently due to cold and wet springs. Under these conditions the pathogen attack is very severe and occurs on leaves, nectariferous glands of the branches, and subsequently on flowers and fruit. This kind of attack causes premature defoliation of leaves and a fruit drop with harmful effects on tree and yield. Susceptible fruit trees are poorly nourished, develop fewer flower buds, and are more easily damaged from freezing in winter. To avoid these negative effects the best approach is to breed and commercially grow cultivars genetically resistant to this pathogen. Our research objective was to identify peach and nectarine (Prunus persica L.) genotypes with genetic resistance to Taphrina deformans. We evaluated 855 peach and nectarine genotypes in our national genetic resource collection from various eco-geographical origins. The conditions of natural infection in this part of Romania allowed grouping the biological material in 5 classes and 8 groups of resistance. This classification was done according to levels of frequency (F%) intensity (I) and peach leaf curl. The peach, nectarine and hybrid cultivars with genetic resistance to this pathogen are: Bella di Roma, Catherine Sel.1, Golden Jubilee, Redhaven, Hardired, Filip, Frumoasa litoralului, Stark Saturn, Creola. | |
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