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GrainGenes Reference Report: TAG-103-625

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Reference	TAG-103-625
Title	QTL analysis of agronomic traits in barley based on the doubled haploid progeny of two elite North American varieties representing different germplasm groups
Journal	Theoretical and Applied Genetics
Year	2001
Volume	103
Pages	625-637
Author	Marquez-Cedillo LA [ Show all 8 ]
Abstract	Summary: A better understanding of the genetics of complex traits, such as yield, may be achieved by using molecular tools. This study was conducted to estimate the number, genome location, effect and allele phase of QTLs determining agronomic traits in the two North American malting barley (Hordeum vulgare L.) quality variety standards. Using a doubled haploid population of 140 lines from the cross of two-rowed Harringtonxsix-rowed Morex, agronomic phenotypic data sets from nine environments, and a 107-marker linkage map, we performed QTL analyses using simple interval mapping and simplified composite interval mapping procedures. Thirty-five QTLs were associated, either across environments or in individual environments, with five grain and agronomic traits (yield, kernel plumpness, test weight, heading date, and plant height). Significant QTLxenvironment interaction was detected for all traits. These interactions resulted from both changes in the magnitude of response and changes in the sign of the allelic effect. QTLs for multiple traits were coincident. The vrs1 locus on chromosome 2 (2H), which determines inflorescence row type, was coincident with the largest-effect QTL determining four traits (yield, kernel plumpness, test weight, and plant height). QTL analyses were also conducted separately for each sub-population (six-rowed and two-rowed). Seven new QTLs were detected in the sub-populations. Positive transgressive segregants were found for all traits, but they were more prevalent in the six-rowed sub-population. QTL analysis should be useful for identifying candidate genes and introgressing favorable alleles between germplasm groups
External Databases	http://link.springer-ny.com/link/service/journals/00122/bibs/1103004/11030625.htm
QTL	QHt.HaMo-1H [ Show all 27 ]
Keyword	[ Hide all but 1 of 52 ] 2-row barley agronomic trait alleles american barley candidate gene chromosome complexes cross data sets date doubled haploid population doubled-haploid environment environment interaction evolution gene genome germplasm haploid heading heading date height hordeum hordeum vulgare inflorescence interval kernel linkage linkage map loci locus malting quality map mapping multiple phase plant height population progeny qtl qtl analysis quality quantitative trait loci six-rowed test weight tool trait two-rowed vrs1 locus x environment interaction yield

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