Erwinia resistance in backcross progenies ofSolanum tuberosum x S. tarijense andS. tuberosum (+) S. commersonii hybrids |
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| Authors: | D Carputo B Basile T Cardi L Frusciante |
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| Institution: | (1) Department of Agronomy and Plant Genetics, Via Università 100, 80055 Portici, Italy;(2) Research Institute for Vegetable and Ornamental Plant Breeding, CNR-IMOF, Via Università 133, 80055 Portici, Italy |
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| Abstract: | Summary The resistance to tuber soft rot caused byErwinia carotovora ofSolanum tuberosum x S. tarijense andS. tuberosum (+) S. commersonii hybrids and their backcrosses is reported. A number of resistant diploid sexual hybrids and tetraploid/hexaploid somatic
hybrids were selected. Backcross progenies were obtained through 2x×4x crosses involving a resistant diploid hybrid and tetraploidS. tuberosum, and through 4x×4x crosses between a resistant somatic hybrid andS. tuberosum. The hybrids showed high variability interms of resistance to tuber soft rot. The resistance of progeny from 2x×4x backcrosses
was similar to that of the parental sexual hybrid. By contrast, the resistance of genotypes deriving from 4x×4x backcrosses
was reduced compared with the resistant somatic hybrid. In general, tuber characteristics of the backcross hybrids improved
considerably as compared with their parents, and tuber yield per plant was good. |
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| Keywords: | tuber soft rot 2n gametes sexual hybridization somatic hybridization germplasm exploitation potato |
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