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United States Department of Agriculture

Agricultural Research Service

Title: External Tuber Resistance to Corky Ringspot Is Controlled by Two Independent, Dominant Genes

Authors
item Weingartner, D. - UNIVERSITY OF FLORIDA
item Haynes, Kathleen
item Meldrum, J. - UNIVERSITY OF FLORIDA
item Goth, Robert

Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: July 20, 1998
Publication Date: N/A

Technical Abstract: Corky ringspot (CRS) in potato tubers is caused by the tobacco rattle virus which is transmitted by Trichodorus spp. of nematodes. External tuber symptoms range from prominent concentric rings of alternating living and necrotic tissue to small necrotic flecks. Sixteen crosses between CRS susceptible and resistant parents were made using a design II mating scheme. The four female parents and Superior' were also crossed to Oceania', a CRS resistant variety. Twenty five progeny from each cross were planted in a Trichodorus infested field in Hastings, FL in 1997 in a randomized complete block design with three replications. Percent CRS free tubers was rated at harvest. Clones with <5% tubers having visual CRS symptoms were considered to have some resistance to CRS. Segregation ratios of resistance to susceptible progeny in 20 of the 21 crosses support a two independent, dominant gene model for resistance to CRS.

Last Modified: 12/21/2014
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