|Mojtahedi, H - WSU-IAREC, PROSSER, WA|
|Santo, G - WSU-IAREC, PROSSER, WA|
Submitted to: Abstract of International Horticultural Congress
Publication Type: Abstract Only
Publication Acceptance Date: January 13, 2002
Publication Date: August 15, 2002
Citation: BROWN, C.R., MOJTAHEDI, H., SANTO, G.S. CHARACTERISTICS OF RESISTANCE TO COLUMBIA ROOT KNOT NEMATODE RESISTANCE INTROGRESSION FROM SEVERAL MEXICAN AND AMERICAN WILD POTATO SPECIES. ABSTRACT OF INTERNATIONAL HORTICULTURAL CONGRESS. P 116. 2002. Technical Abstract: Columbia root-knot nematode is a serious pest of potato in the Pacific Northwest and in the Netherlands. At present, control is achieved by chemical fumigation, a costly and environmentally polluting practice. Resistance has been found in several wild species endemic to Mexico and the United States. This type of resistance is expressed as lower root infestation rates and a barrier to the successful establishment of a feeding site, giant cell, and reproduction. The juveniles remain in a vermiform stage. It appears that localized cell death accompanies the resistance reaction suggesting the functioning of an R-gene. The inheritance and chromosomal location was identified for Solanum bulbocastanum and S. hougasii sources of infection. The upper arm of chromosome 11 is the location in both species, suggesting synteny and possible presence of the primitive B genome, hypothesized for S. bulbocastanum, in the two species. Recent surveys have confirmed that two of twelve plant introduction accessions of S. fendleri tested were 100% resistant to Columbia root-knot nematode. Resistance from S. bulbocastanum has been introduced via protoplast fusion into the cultivated potato breeding gene pool and a backcrossing program has produced advanced clones with root-knot resistance, good horticultural type, acceptable fry color and long tuber shape.