|Weingartner, D. - UNIVERSITY OF FLORIDA|
Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: May 18, 1999
Publication Date: N/A
Technical Abstract: Corky ringspot (CRS) in potato tubers is caused by tobacco rattle virus which in Florida is transmitted by trichodorid nematodes, principally Paratrichodorus minor. External tuber symptoms range from prominent concentric rings of alternating living and necrotic tissue to small necrotic flecks. The internal tuber symptom is necrosis. Twenty crosses between CRS susceptible and resistant parents were made using a design II mating scheme. Twenty-five progeny from each cross were planted in 1997 in a randomized complete block design with three replications in a trichodorid infested field in Hastings, FL. Incidence and severity of CRS were recorded at harvest. Approximately 145 of the tubers showed internal symptoms, but only 4% of the tubers showed external symptoms of CRS. Additive variance was approximately twice as great as dominance variance for both incidence and severity of CRS. Because the inheritance of resistance to CRS is controlled by no more than one or two genes, breeding for resistance should be a relatively direct process.