Comparison and analysis of main effects,epistatic effects,and QTL × environment interactions of QTLs for agronomic traits using DH and RILs populations in rice |
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| Authors: | Xinhua Zhao Yang Qin Baoyan Jia Suk-Man Kim Hyun-Suk Lee Moo-Young Eun Kyung-Min Kim Jae-Keun Sohn |
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| Institution: | (1) Molecular Biology Laboratory, Department of Genetics and Plant Breeding, Ch. Charan Singh University, Meerut, Uttar Pradesh, 250 004, India;(2) Directorate of Wheat Research, Agrasain Road, Post Box 158, Karnal, 132 001, India; |
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| Abstract: | Two genetic linkage maps based on doubled haploid (DH) and recombinant inbred lines (RILs) populations, derived from the same
indica-japonica cross ‘Samgang × Nagdong’, were constructed to analyze the quantitative trait loci (QTLs) affecting agronomic traits in rice.
The segregations of agronomic traits in RILs population showed larger variations than those in DH population. A total of 10
and 12 QTLs were identified on six chromosomes using DH population and seven chromosomes using RILs population, respectively.
Three stable QTLs including pl9.1, ph1.1, and gwp11.1 were detected through different years. The percentages of phenotypic variation explained by individual QTLs ranged from 8
to 18% in the DH population and 9 to 33% in the RILs population. Twenty-three epistatic QTLs were identified in the DH population,
while 21 epistatic QTLs were detected in the RILs population. Epistatic interactions played an important role in controlling
the agronomic traits genetically. Four significant main-effect QTLs were involved in the digenic interactions. Significant
interactions between QTLs and environments (QE) were identified in two populations. The QTLs affecting grain weight per panicle
(GWP) were more sensitive to the environmental changes. The comparison and QTLs analysis between two populations across different
years should help rice breeders to comprehend the genetic mechanisms of quantitative traits and improve breeding programs
in marker-assisted selection (MAS). |
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