TY - JOUR
T1 - Interval mapping of quantitative trait loci for resistance to late blight [Phytophthora infestans (Mont.) de bary], height and maturity in a tetraploid population of potato (Solanum tuberosum subsp. tuberosum)
AU - Bradshaw, John E.
AU - Pande, Barnaly
AU - Bryan, Glenn J.
AU - Hackett, Christine A.
AU - McLean, Karen
AU - Stewart, Helen E.
AU - Waugh, Robbie
PY - 2004/10/1
Y1 - 2004/10/1
N2 - Interval mapping of quantitative trait loci (QTL) for resistance to late blight, height, and maturity was performed on a tetraploid full-sib family of potato comprising 227 clones from a cross between a susceptible parent, 12601ab1, and a resistant cultivar, Stirling, which were of similar height and main crop maturity. Thirty-eight AFLP primer combinations provided 585 informative markers, and 23 SSRs proved useful for identifying linkage groups (LGs). A simplex QTL allele was found on LGV of Stirling close to marker STM3179, which was associated with early maturity, short plants, and susceptibility to blight and explained 54.7, 26.5, 26.3, and 17.5% of the variation for maturity, height, tuber blight, and foliage blight. When the residuals from the regressions of foliage and tuber blight on maturity were analyzed, there was no significant effect of a QTL on LGV, but a duplex QTL allele for resistance was found on LGIV of Stirling, which explained 30.7 and 13.6% of the variation for foliage and tuber blight on an additive model. Partial dominance for resistance explained even more of the variation, up to 37.2% for foliage blight. A major gene for blight resistance in Stirling was also mapped to LGXI.
AB - Interval mapping of quantitative trait loci (QTL) for resistance to late blight, height, and maturity was performed on a tetraploid full-sib family of potato comprising 227 clones from a cross between a susceptible parent, 12601ab1, and a resistant cultivar, Stirling, which were of similar height and main crop maturity. Thirty-eight AFLP primer combinations provided 585 informative markers, and 23 SSRs proved useful for identifying linkage groups (LGs). A simplex QTL allele was found on LGV of Stirling close to marker STM3179, which was associated with early maturity, short plants, and susceptibility to blight and explained 54.7, 26.5, 26.3, and 17.5% of the variation for maturity, height, tuber blight, and foliage blight. When the residuals from the regressions of foliage and tuber blight on maturity were analyzed, there was no significant effect of a QTL on LGV, but a duplex QTL allele for resistance was found on LGIV of Stirling, which explained 30.7 and 13.6% of the variation for foliage and tuber blight on an additive model. Partial dominance for resistance explained even more of the variation, up to 37.2% for foliage blight. A major gene for blight resistance in Stirling was also mapped to LGXI.
UR - http://www.scopus.com/inward/record.url?scp=8544249196&partnerID=8YFLogxK
U2 - 10.1534/genetics.104.030056
DO - 10.1534/genetics.104.030056
M3 - Article
C2 - 15514069
AN - SCOPUS:8544249196
SN - 0016-6731
VL - 168
SP - 983
EP - 995
JO - Genetics
JF - Genetics
IS - 2
ER -