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The Journal of Heredity 1995:86(2):89-93
© 1995 The American Genetic Association 86:89-93

research-article

Inheritance of Resistance to Potato Virus Y and Potato Virus X in Hybrid Solanum phureja x S. stenotomum Diploid Potatoes

R. L. Vallejo, W. W. Collins, and J. B. Young

Department of Horticultural Science, North Carolina State University Box 7609, Raleigh, NC 27695-7609
Department of Plant Pathology, North Carolina State University Raleigh

Abstract

Inheritance of resistance to infection by potato virus Y (PVY) strain o and potato virus X (PVX) U.S. common strain of hybrid Solanum phureja-S. stenotomum diploid potatoes was elucidated. Extreme resistance and susceptable clones to infection by either PVY or PVX were intercrossed in separate crossing blocks to generate 22 PVY and 19 PVX hybrid familes, which were evaluated for resistance to PVY and PVX, respectively. Probabilities associated with X2 values strongly supported the hypothesis that resistance to infection by PVY was controlled by complementary action of at least two dominant genes. Additionally, probabilities associated with total, pooled, and heterogeneity X2 values for resistance to susceptibility ratios of 1: 3, 1: 1, and 9: 7 did not support rejecting this hypothesis. Similarly, probabilities associated with X2 values estimated, assuming a dominance modification of two genes as controlling resistance to infection by PVX, strongly supported this hypothesis. Also, probabilities associated with pooled X2 values for 3: 1 and 1: 1 ratios of resistance and susceptibility did not support rejecting this hypothesis. In addition, a gene-dosage dependence model was proposed to explain the genetics of necrotic reactions to infection by PVX: probabilities associated with segregation ratios of less than half of the evaluated families supported this genetic model; lack of complete fit in the other families might be due to the marked influence of environmental conditions on expression of necrotic reactions.


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