Reference "Characterization of the genetic basis for yield and its component traits of rice revealed by doubled haploid population"

Reference ID

8354

Title

Characterization of the genetic basis for yield and its component traits of rice revealed by doubled haploid population

Source

Acta genetica Sinica, 2004, vol. 31, pp. 63-72

Authors (4)

Jiang-G-H	Xu-C-G
Li-X-H	He-Y-Q

Abstract

Main-effect QTL, epistatic effects and their interactions with environment are
important genetic components of quantitative traits. In this study, we analyzed
the QTLs, epistatic effects and QTL by environment interactions (QE) underlying
nine traits of yield and yield-component, using a doubled-haploid (DH)
population consisted of 190 lines from the cross between an indica parent
Zhenshan 97 and a japonica parent WYJ 2, and tested in two-year replicated field
trials. A genetic linkage map with 179 SSR (simple sequence repeat) marker loci
was constructed. A mixed linear model approach was applied to detect QTLs,
digenic interactions and QEs for the nine traits. In total, 57 QTLs of main
effects, 41 digenic interactions, eight QEs and seven interactions of epistasis
by environment were detected. Each of the main-effect QTLs individually
explained 1.3 % to 25.8% of the phenotypic variations. And they collectively
explained 11.5% to 66.8% of the phenotypic variations for these traits. Most of
the traits (except seed setting) had the QTLs simultaneously detected in two
years. Many of the traits shared same QTLs with each other, which is consistent
with their significant phenotypic correlations. The pleiotropism or tight
linkage of QTLs for different traits might be the important genetic base for
trait correlations. The environmental influences on the stability of the trait
performance were also discussed.