TITLE:
QTL Analysis of Yield Components in Rice Using a Cheongcheong/Nagdong Doubled Haploid Genetic Map
AUTHORS:
Gyu Hwan Park, Jin-Hee Kim, Kyung-Min Kim
KEYWORDS:
Rice; QTL; Yield; Epistatic
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.5 No.9,
April
3,
2014
ABSTRACT: In this study, only two of 12 quantitative trait loci (QTLs) affecting
yield and yield components were identified in a single year, indicating that
individual QTLs are probably sensitive to the environment. A rice growth survey
of “Cheongcheong” and “Nag dong” in a doubled haploid population in 2012
revealed that yield capacity was influenced by climate change. Analysis of
yield and yield components indicated that five average traits are high in “Cheongcheong”.
Frequency distribution tables indicated that panicles per plant (PPP), spike lets
per panicle (SPP), and 1000-grain weight (TGW) were normally distributed. The
strongest relationship was identified between SPP and seed set percentage (SSP)
among phenotypic correlations related to yield and yield components found on
chromosomes 2, 3, 6, 8 in 2012. SPP and SSP was a very relevant requisite about
quantity. Analysis of QTL about quantity was total 9. In the present study, a
doubled haploid population was used to analyze the epistatic effects on yield
and yield components in rice. Although other epistatic QTLs were not included
in any of the main-effect QTLs, they significantly influenced the traits. These
results indicated that epistatic interaction plays an important role in
controlling the expression of complex traits. Thus, the utilization of
marker-assisted selection in rice breeding programs should take epistatic
effects into consideration. Hence, the QTLs responsible for major effects are
more suitable for marker-assisted selection programs to improve yield and
related traits across different environments.