ISHS Acta Horticulturae 528: VII International Symposium on Grapevine Genetics and Breeding
WINEGRAPE BREEDING FOR FUNGUS DISEASE RESISTANCE |
| Author: | P. Kozma Jr |
| Keywords: | Fungus diseases, resistance, breeding, analysis, inheritance |
| Abstract:
Growing of grape varieties resistant against different fungus diseases is important not only for environmental aspects, but also in the immediate future it can be of high economic concerns. The requirement of cultivation without spraying is cultivation of grape varieties which are highly resistant against damaging biotic and abiotic factors. The aim of our cross-breeding program was to create new hybrids highly resistant against downy mildew and gray rot and better than medium resistant against powdery mildew. In our crossing program we used Vitis amurensis hybrids, Vitis vinifera varieties and progenics of Franco-American hybrids. We evaluated the level of resistance on a five-degree scale, after artificial and natural infection. The inheritance of resistance to downy mildew and powdery mildew was of dominant type. The degrees of resistance showed great variability according to genetic origin of parents. As a result of our evaluating work we could select the new promising forms according to our breeding aims, which were got mainly from crossing of progenies of Franco-American hybrids and Eastern-Asian Vitis amurensis hybrids. These candidate varieties can be grown without plant protection even during epidemic downy mildew infection. These hybrids are valuable donors for the resistance breeding, on concerning that in newer back-crosses highly resistant seedlings segregated in high percentage. | |
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