TY - JOUR
T1 - QTL mapping in tropical maize
T2 - I. Genomic regions affecting leaf feeding resistance to sugarcane borer and other traits
AU - Bohn, M.
AU - Khairallah, M. M.
AU - González-de-León, D.
AU - Hoisington, D. A.
AU - Utz, H. F.
AU - Deutsch, J. A.
AU - Jewell, D. C.
AU - Mihm, J. A.
AU - Melchinger, A. E.
PY - 1996
Y1 - 1996
N2 - Sugarcane borer (SCB), Diatraea saccharalis Fabricius, is a serious pest in tropical maize production areas in the Americas. Little is known about the genetic resistance of maize genotypes to this pest. In this study, we mapped and characterized quantitative trait loci (QTL) affecting resistance to the leaf feeding generation of SCB (ISCB), grain yield under both protection (GYP) and infestation (GYI) with SCB larvae, and plant height (PHT). A total of 171 F2 genotypes derived from cross CML131 (susceptible) x CML67 (resistant) and 93 RFLP marker loci were used in QTL analyses. F3 lines were evaluated for the above traits and grain yield reduction (GYR) in field experiments with two replications at two or three tropical environments. Resistance was assessed by rating leaf feeding damage after artificial infestation with SCB larvae. The method of composite interval mapping with selected markers as cofactors was used for detection and characterization of QTL. Resistance to ISCB was significantly affected by 10 putative QTL on Chromosomes 1, 2, 5, 7, 8, 9, and 10. These showed predominantly additive gene action and explained 65.0% of the phenotypic variance and 93.5% of the genetic variance in a simultaneous fit. Six QTL for GYP, five QTL for GYI with primarily dominant genetic effects, and four QTL for PHT with primarily additive genetic effects were identified, explaining in total about one third of the phenotypic variance for the respective trait. No more than one putative QTL was found to be common between different characters. QTL x environment interaction was found to be significant for ISCB ratings only. Based on these data, prospects for improving ISCB resistance by marker- assisted breeding are promising.
AB - Sugarcane borer (SCB), Diatraea saccharalis Fabricius, is a serious pest in tropical maize production areas in the Americas. Little is known about the genetic resistance of maize genotypes to this pest. In this study, we mapped and characterized quantitative trait loci (QTL) affecting resistance to the leaf feeding generation of SCB (ISCB), grain yield under both protection (GYP) and infestation (GYI) with SCB larvae, and plant height (PHT). A total of 171 F2 genotypes derived from cross CML131 (susceptible) x CML67 (resistant) and 93 RFLP marker loci were used in QTL analyses. F3 lines were evaluated for the above traits and grain yield reduction (GYR) in field experiments with two replications at two or three tropical environments. Resistance was assessed by rating leaf feeding damage after artificial infestation with SCB larvae. The method of composite interval mapping with selected markers as cofactors was used for detection and characterization of QTL. Resistance to ISCB was significantly affected by 10 putative QTL on Chromosomes 1, 2, 5, 7, 8, 9, and 10. These showed predominantly additive gene action and explained 65.0% of the phenotypic variance and 93.5% of the genetic variance in a simultaneous fit. Six QTL for GYP, five QTL for GYI with primarily dominant genetic effects, and four QTL for PHT with primarily additive genetic effects were identified, explaining in total about one third of the phenotypic variance for the respective trait. No more than one putative QTL was found to be common between different characters. QTL x environment interaction was found to be significant for ISCB ratings only. Based on these data, prospects for improving ISCB resistance by marker- assisted breeding are promising.
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U2 - 10.2135/cropsci1996.0011183X003600050045x
DO - 10.2135/cropsci1996.0011183X003600050045x
M3 - Article
AN - SCOPUS:0030447819
SN - 0011-183X
VL - 36
SP - 1352
EP - 1361
JO - Crop Science
JF - Crop Science
IS - 5
ER -