In:
Crop Science, Wiley, Vol. 49, No. 1 ( 2009-01), p. 139-149
Abstract:
The maize weevil (MW), Sitophilus zeamais (Motsch.), is an important pest of stored maize ( Zea mays L.) in tropical areas. Quantitative trait loci (QTL) associated with MW resistance were analyzed. A total of 163 F 2 progeny derived from the cross CML290 (susceptible) × Muneng‐8128 C0 HC1‐18‐2‐1‐1 (resistant), were genotyped with 151 molecular markers. Resistance was evaluated using bioassays on replicated F 2:3 progenies. Grain damage (GD), grain weight losses (GWL), MW susceptibility index (Dobie index [DI]), and numbers of adult progeny (AP) were evaluated on grain from F 2 lines across two environments. Grain hardness and pericarp/grain ratio were evaluated as putative components of resistance. Composite interval mapping was used for QTL analysis. Five QTL dispersed across the genome explained 28% of the phenotypic variance (σ p 2 ) and 50% of the genotypic variance (σ g 2 ) for GD. Six QTL were detected with effects on GWL and explained 22% of σ p 2 and 47% of σ g 2 Seven QTL (27% σ p 2 and 78% σ g 2 ) were identified for DI and three QTL (10% σ p 2 and 23% σ g 2 ) for AP. Both parents contributed resistance alleles. Genetic effects were mainly dominant (GD, GWL, and DI) and additive (AP). Quantitative trait loci × environment interaction was significant for 50% of the QTL. Since the identified QTL accounted for less than a third of σ p 2 , additional mapping populations are required for mapping MW susceptibility.
Type of Medium:
Online Resource
ISSN:
0011-183X
,
1435-0653
DOI:
10.2135/cropsci2007.06.0326
Language:
English
Publisher:
Wiley
Publication Date:
2009
detail.hit.zdb_id:
1480918-7
Permalink