Progeny tests to identify diploid potato clones homozygous at loci controlling resistance to PLRV |
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Authors: | Bogdan Flis Iwona Wasilewicz-Flis |
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Institution: | (1) Młochów Research Center, Plant Breeding and Acclimatization Institute, Młochów, 05-832, Rozalin, Poland |
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Abstract: | Summary Using potato parental lines homozygous at a locus or loci controlling resistance to potato leafroll virus (PLRV) can give
advantages in the selection of resistant forms. In order to identify homozygous diploid clones their test-cross families were
evaluated. All the clones that were test-crossed expressed resistance in primarily- and secondarily-infected plants and etiolated
sprouts, and were derived from mating genotypes highly resistant to PLRV. Genotypes from test-cross families varied in resistance
to PLRV, and one family was found which had only resistant genotypes, suggesting that the resistant parent of this progeny
was homozygous at resistance loci. Evidence was gathered that resistance in some diploid clones may result from resistance
to virus multiplication as well as restricted virus transport from leaves to tubers. |
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Keywords: | homozygous genotypes Solanum tuberosum L |
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