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ARS Home » Research » Publications at this Location » Publication #89969
Title: GENETIC VARIATION FOR RESISTANCE TO PHYTOPHTHORA INFESTANS IN A DIPLOID SOLANUM PHUREJA-S. STENOTOMUM HYBRID POTATO POPULATION IN PENNSYLVANIA

Author
item Haynes, Kathleen
item CHRIST, BARBARA - PENNSYLVANIA STATE UNIV.

Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: 6/9/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The emergence of new races of Phytophthora infestans has necessitated the search for additional sources of potato germplasm with resistance to late blight. Two hundred eighty-one clones from a diploid hybrid population of Solanum phureja-S. stenotomum and the check variety 'Atlantic' were evaluated in a randomized complete block design consisting of two replications in field experiments in Pennsylvania in 1996 and 1997. Four tubers per clone were planted in each plot. The US-8, A-2 mating type of P. infestans was present in the field both years. Percent defoliation due to the late blight fungus was recorded in each plot three times towards the end of the growing season. Area under the disease progress curve (AUDPC) was calculated for each plot. There were significant differences among families and among selections within families for AUDPC both years. Late blight was more severe in 1997 than in 1996. Seventy-five percent of the diploid clones had a significantly lower mean AUDPC than 'Atlantic'. Broad sense heritability of a mean basis was estimated as 0.78.