THE INFLUENCE OF PRUNUS NECROTIC VIRUS AND PLUM DWARF VIRUS ON FROST RESISTANCE OF SOUR CHERRY [VLIV INFEKCE PNRSV A PDV NA MRAZUODOLNOST VIŠNÍ]

Abstract

This article presents the results of testing the effect of virus infection on the frost resistance of sour cherry varieties of Ukrainian breeding. ‘Ksenia’ and ‘Boguslavka’ varieties were used. Damage to the tissues of buds and shoots at temperatures of 4 °C, –25 °С, –30 °С was compared on plants infected with viruses (PNRSV in the variety ‘Ksenia’, PDV in the variety ‘Boguslavka’) and healthy plants. The degree of frost damage was classified on a scale from zero (no damage) to five (100% tissue damage). In each variant, 10–34 buds and 3–14 shoots were tested. It was found that the PDV and PNRSV viruses have a negative effect on the frost resistance of bud tissues. At –25°С, the average degree of bud tissue damage reached 3.2 points in the variety ‘Ksenia’ (PNRSV) and 4.1 points in the variety ‘Boguslavka’ (PDV). At –30 °C, the degree of damage to the buds of both varieties was 4.2 points. The same temperatures had a less impact on the tissues of the shoots. The highest damage was recorded in cambium tissues of the infected ‘Boguslavka’ variety at –30 °С, and the lowest was in bark samples of the infected ‘Ksenia’ variety (0.8 points at –25 °С).

Keywords

• prunus cerasus
• pnrsv
• pdv
• bud
• shoot
• bark
• cambium
• xylem
• pith