Genetics of resistance to Plum pox virus in apricotška B., Salava J., Polák J., Komínek P. (2002): Genetics of resistance to Plum pox virus in apricot. Plant Protect. Sci., 38: 180-182.
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Plum pox virus (PPV) causes serious damage in apricots grown in the Czech Republic and other countries where it is
present. The virus spreads in orchards from infected trees by aphids to healthy trees of susceptible cultivars. Chemical
control is ineffective from epidemiological point of view. For this reason growing of resistant apricot cultivars is the only
way how to solve one of the most significant phytopathological problem. To study PPV resistance in apricot, three crosses
between an apricot cultivars or a selection resistant to PPV and an apricot cultivars or a selection susceptible to PPV
(LE-3218 × Stark Early Orange, LE-3241 × Vestar and LE-3246 × Vestar) were performed at Faculty of Horticulture
of Mendel University of Agriculture and Forestry in Lednice na Moravě in 1999. The BC1 seeds were stratified and the
subsequent seedlings were grown in a greenhouse. The seedlings were repeatedly inoculated with PPV-Vegama isolate
(PPV-M strain) by an infected chip. The resistance of the plants was evaluated by symptom observing and ELISA in
three consecutive growth periods. The χ2 test was used to analyse the data. It was found that two independent dominant
complementary genes conditioned PPV resistance in apricot. The significance of these findings in relation to other reports
is discussed. Knowledge of PPV resistance inheritance will help in planning apricot breeding programmes.
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