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Mapping Quantitative Trait Loci for Resistance to Goss's Bacterial Wilt and Leaf Blight in North American Maize by Joint Linkage Analysis
Author(s) -
Singh Amritpal,
Andersen Aaron P.,
JacksonZiems Tamra A.,
Lorenz Aaron J.
Publication year - 2016
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2015.09.0543
Subject(s) - biology , quantitative trait locus , linkage (software) , germplasm , genetic linkage , genetics , family based qtl mapping , association mapping , resistance (ecology) , bacterial wilt , inclusive composite interval mapping , trait , gene mapping , botany , agronomy , genotype , gene , chromosome , single nucleotide polymorphism , computer science , programming language
Goss's wilt and leaf blight is a bacterial disease of maize ( Zea mays L.) caused by the Gram‐positive bacterium Clavibacter michiganensis subsp. nebraskensis . Goss's wilt has re‐emerged as an important disease in the western United States and is spreading to other areas. Although the reasons for this re‐emergence are not completely known, it is important to understand the genetic basis of resistance to Goss's wilt. The objective of this study was to map the quantitative trait loci (QTL) underlying resistance to Goss's wilt. To achieve this objective, joint linkage and linkage mapping in 3 of the 25 nested association mapping families were used. Three biparental linkage mapping families including ‘B73’ × ‘Oh43’, B73 × ‘HP301’, and B73 × ‘P39’ were evaluated for Goss's wilt in Nebraska. Eleven QTL were detected on chromosomes 1, 2, 3, 4, 5, and 10 through joint linkage mapping. The joint linkage model explained 45% of the phenotypic variation for Goss's wilt. Linkage mapping in each of the three families identified nine, six, and four QTL in the families B73 × Oh43, B73 × HP301, and B73 × P39, respectively. Joint linkage and linkage analysis were also conducted within each environment to detect any environment‐specific QTL. However, most of the QTL were colocalized with QTL detected in across environment joint linkage and linkage mapping. These results will help us to understand the genetic basis of resistance to Goss's wilt better and may facilitate maize breeding programs to incorporate resistance to Goss's wilt into the maize germplasm.