Articles
CHARACTERISTICS OF RESISTANCE TO COLUMBIA ROOT-KNOT NEMATODE INTROGRESSED FROM SEVERAL MEXICAN AND NORTH AMERICAN WILD POTATO SPECIES
Article number
619_12
Pages
117 – 125
Language
English
Abstract
The Columbia root-knot nematode (CRN), Meloidogyne chitwoodi is a serious pest of potato in the Pacific Northwest of the US and in the Netherlands.
At present, control is achieved by chemical fumigation, a costly 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.
In resistant roots, 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 two sources of resistance, Solanum bulbocastanum, a diploid, and S. hougasii, a hexaploid, as the upper arm of chromosome 11. The localization of resistance to the same chromosome suggests synteny and the possible presence of the primitive B genome of S. bulbocastanum in S. hougasii. Recent surveys have confirmed that two out of 12 plant introduction accessions of S. fendleri tested were 100% resistant to race 1 of CRN. Resistance derived from S. bulbocastanum was introduced into cultivated potato by protoplast fusion, and a traditional backcrossing program has produced advanced breeding clones with root-knot resistance, good horticultural type, acceptable fry color and long tuber shape.
At present, control is achieved by chemical fumigation, a costly 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.
In resistant roots, 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 two sources of resistance, Solanum bulbocastanum, a diploid, and S. hougasii, a hexaploid, as the upper arm of chromosome 11. The localization of resistance to the same chromosome suggests synteny and the possible presence of the primitive B genome of S. bulbocastanum in S. hougasii. Recent surveys have confirmed that two out of 12 plant introduction accessions of S. fendleri tested were 100% resistant to race 1 of CRN. Resistance derived from S. bulbocastanum was introduced into cultivated potato by protoplast fusion, and a traditional backcrossing program has produced advanced breeding clones with root-knot resistance, good horticultural type, acceptable fry color and long tuber shape.
Authors
C.R. Brown, H. Mojtahedi, G.S. Santo
Keywords
Meloidogyne chitwoodi, Solanum bulbocastanum, Solanum hougasii, Solanum fendleri, gene mapping, resistance genes, germplasm enhancement, breeding
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