Partial resistance to late blight (Phytophthora infestans) in hybrid progenies of four South American Solanum species crossed with diploid Solanum tuberosum

Resistant genotypes of the diploid tuber-bearing South American species Solanum arnezii x hondelmannii, Solanum berthaultii, Solanum leptophyes and Solanum microdontum were crossed with three diploid genotypes of Solanum tuberosum that varied in resistance and maturity type. The progenies were field...

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Bibliographic Details
Published in:Theoretical and applied genetics 1995, Vol.90 (5)
Main Authors: Colon, L.T, Jansen, R.C, Budding, D.J. (DLO-Centre for Plant Breeding and Reproduction Research, Wageningen (Netherlands))
Format: Article
Language:English
Subjects:
HEREDITE
HERENCIA GENETICA
HIBRIDACION INTERESPECIFICA
HYBRIDATION INTERSPECIFIQUE
PHYTOPHTHORA INFESTANS
RESISTANCE AUX MALADIES
RESISTENCIA A LA ENFERMEDAD
SOLANUM BERTHAULTII
SOLANUM TUBEROSUM
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Summary:Resistant genotypes of the diploid tuber-bearing South American species Solanum arnezii x hondelmannii, Solanum berthaultii, Solanum leptophyes and Solanum microdontum were crossed with three diploid genotypes of Solanum tuberosum that varied in resistance and maturity type. The progenies were field tested for 2 years for resistance to a complex race of Phytophthora infestans. A wealth of genetic variation for resistance was found in most of the progenies. At least two susceptibility groups could be distinguished in some progenies of S. microdontum. This could be explained by the presence of several major resistance genes in the wild parent and, unexpectedly, in the susceptible parent SH 82-44-111. In most of the wild parents and in the susceptible parent SH 77-114-2988 there appeared to be minor resistance genes. General combining ability effects were predominant; small specific combining ability effects were detected in some crosses of S. microdontum. Gene action appeared dominant in some crosses.
ISSN:0040-5752
1432-2242