欧亚种葡萄白粉病抗性及其稳定性研究

STUDY ON THE RESISTANCE TO UNCINULA NEGATOR AND ITS STABILITY OF VITIS VINIFERA

The resistance to Uncinula necator was studied with 67 cultivars of Vitis vinifera by inoculation on leaf discs in laboratory and by natural infection of berries in field condition. The relation between the host and the pathogen was also studied by specific inoculation using 4 natural pathogen groupes and 5 host varieties in laboratory conditions. The results showed that the pathogenecity of the natural groupes of the pathogen and the resistance of the host varieties were both different, but there was no specific interaction between the host and the pathogen . Evaluation on resistance to this disease in progenies from both selfing and hybridization of cultivars of V. vinifera, by artificial inoculation on plants in greenhouse, showed that the differences of the resistance level among the varieties could be stably inherited, as the proportion of resistant plants in progenies was positively correlated, to resistance level of their parent (s) . These indicate chat minor resistant genes exist in V.vinifera and the differences of resistance to powdery mildew in F. vinifera are probably due to the different number of resistant genes and their nature. The resistance in leaves is positively correlated with that in berries.Consequently, the resistance level of grapes to U.necator can be increased by intraspecific hybridization of V. vinifera and this resistance level will remain stable.