Liu, Xiao-Hong and He, Su-Lan and Zheng, Zu-Ping and Huang, Yu-Bi and Tan, Zhen-Bo and Li, Zhong and He, Chuan and Wu, Xun and Pu, Quan-Bo
(2010)
Identification of the QTLs for grain yield using RIL
population under different nitrogen regimes in maize.
African Journal of Agricultural Research , 5 (15).
pp. 2002-2007.
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Abstract
Quantitative trait locus (QTL) mapping can provide useful information for breeding programs, since it
allows the estimation of genomic locations and genetic effects of chromosomal regions related to the
expression of quantitative traits. To realize the genetic basis of grain yield of maize (Zea mays L.), a
recombinant inbred line (RIL) population and two nitrogen (N) regimes were used to detect the QTLs for
grain yield in maize, as a result, a total of six QTLs associated with grain yield per year (GYPE) were
identified on chromosomes 1 (one), 6 (one), 8 (two) and 9 (two), with 0 - 12.0 cm of mapping interval
between QTLs and their nearest markers. The three QTLs identified under high N regime could explain
18.07% of phenotypic variance, and could increase GYPE from 3.91 - 5.40 g, due to positive additive
effects. Whereas, the three QTLs located under low N regime could account for 20.96% of phenotypic
variance, and due to negative additive effects, they could decrease GYPE from 3.40 to 6.68 g. These
results were beneficial for realizing the genetic basis of GYPE and developing marker-assisted
selection in maize breeding project.
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