Identification of QTLs for yield and yield components of barley under different growth conditions.
Waterlogging is a major abiotic stress limiting barley (Hordeum vulgare L.) yield and its stability in areas with excessive rainfall. Identification of genomic regions influencing the response of yield and its components to waterlogging stress will enhance our understanding of the genetics of waterlogging tolerance and the development of more tolerant barley cultivars. Quantitative trait loci (QTLs) for grain yield and its components were identified using 156 doubled haploid (DH) lines derived from a cross between the cultivars Yerong (waterlogging-tolerant) and Franklin (waterlogging-sensitive) grown under different conditions (waterlogged and well drained). A total of 31 QTLs were identified for the measured characters from two experiments with two growth environments. The phenotypic variation explained by individual QTLs ranged from 4.74% to 55.34%. Several major QTLs determining kernel weight (KW), grains per spike (GS), spikes per plant (SP), spike length (SL) and grain yield (GY) were detected on the same region of chromosome 2H, indicating close linkage or pleiotropy of the gene(s) controlling these traits. Some different QTLs were identified under waterlogging conditions, and thus different markers may have to be used in selecting cultivars suitable for high rainfall areas.
Xue
Da-wei
DW
College of Life and Environment Sciences, Hangzhou Normal University, Hangzhou 310036, China.
Zhou
Mei-xue
MX
Zhang
Xiao-qin
XQ
Chen
Song
S
Wei
Kang
K
Zeng
Fan-rong
FR
Mao
Ying
Y
Wu
Fei-bo
FB
Zhang
Guo-ping
GP
D002874:Chromosome Mapping / Q000379:methods*; D018745:Genome, Plant / Q000235:genetics*; D001467:Hordeum / Q000235:genetics* / Q000254:growth & development*; D010641:Phenotype; D010935:Plant Diseases / Q000235:genetics*; D040641:Quantitative Trait Loci / Q000235:genetics*