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A NEW BREEDING PROGRAM FOR RESISTANCE TO PPV (PLUM POX VIRUS) IN SOME ROMANIAN APRICOT PROGENIES

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Author(s): Ligia Ion, | C. Moale

Journal: Scientific Papers of the Research Institute for Fruit Growing Pitesti, Romania
ISSN 1584-2231

Volume: XXVII;
Start page: 27;
Date: 2011;
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Keywords: plum pox virus | apricot | cultivars | breeding | resistance

ABSTRACT
Breeding for fruit resistant to pests and diseases has become a major objective for many research laboratories. Excessive use of pesticides is increasingly denounced by consumers and the rules controlling their use (particularly with respect to toxic residues) are increasingly restricting. The use of resistant cultivars reduces production costs and increases workers safety. Prospecting through Romanian apricot collections has leaded us to the discovery of several sources of resistance to Sharka. The different Romanian hybrids or local apricot varieties was chosen among the different sources of resistance as it could also be used to develop a weeping variety in the some breeding program. To start with, the resistance mode of heritability was studied by creating F1 generations from the resistant parent crossed with a sensitive one, Mari de Cenad The resistance character is dominant and monogenic (symbols Rm1/m1). Breeding was continued by creating the F2 generations using by resistance parent “ Stark Early Orange” and “ NJA 2” and after that to improve fruit quality by use backcrosses with extra quality varieties like Mamaia, Ovidiu, Tudor etc. The paper describes the breeding work involved in this program. The resistance/susceptibility level of 213 descendants from three different crosses between the Romanian apricot cultivar ‘Mari de Cenad’ (susceptible to Plum pox virus, sharka), and the North American cultivar ‘Stark Early Orange’, and “NJA 2” (resistant) was evaluated during four cycles of study under controlled greenhouse conditions. Resistant: susceptible ratios were 91:16 in the case of the ‘Stark Early Orange’ open-pollination descendants, 52:26 in ‘Mari de Cenad’ _ ‘Stark Early Orange’ descendants.
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