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ISHS Acta Horticulturae 1139: III Balkan Symposium on Fruit Growing

Examination of disease resistant sour cherry genotypes bred in Hungary

Authors:   S. Szügyi, J. Apostol, Zs. Rozsnyay, G. Bujdosó, É. Sárdi
Keywords:   sour cherry, resistance, carbohydrates, Monilinia laxa, infection
DOI:   10.17660/ActaHortic.2016.1139.3
The Monilinia laxa has caused serious infections in orchards in Hungary for 20 years. Beside cherry leaf spot (Blumeriella jaapii), brown rot (Monilinia laxa) is the most important disease of sour cherry. The most susceptible Hungarian sour cherry cultivar is 'Érdi Bőtermő'. Its importance is high for the Hungarian sour cherry production, because this cultivar is grown on about 4000 ha. During the examinations of Monilinia susceptibility of sour cherry cultivars it was established that the Blumeriella resistant 'Csengődi' cultivar shows high tolerance to Monilinia laxa as well. Therefore 'Érdi Bőtermő' was used as mother plant and 'Csengődi' as pollen donor in our resistance breeding programme. The most important aims of the breeding programme were: to get hybrid seedlings resistant or tolerant to Monilinia laxa, with fruit characteristics and productivity equal or higher than 'Érdi Bőtermő', self-fertile, and to select Monilinia laxa isolates suitable for artificial infections according to their pathogenicity. A result of our breeding programme was a new sour cherry candidate cultivar, 'Érdi Bíbor', which was applied for state registration in 2014. In the frame of our selection work, experiments were started in cooperation with Corvinus University of Budapest, Department of Genetics and Plant Breeding in order to examine compounds related to resistance to M. laxa pathogen. In these experiments, OPLC (Overpressured Layer Chromatography) method was used for separation and quantification of saccharide composition of artificially infected shoots of the most susceptible, and the most resistant sour cherry hybrids and their parents. Based on our results so far, the monosaccharide contents of the infected phloems correlate with the disease resistance.

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