Reference "Gene actions of QTLs affecting several agronomic traits resolved in a recombinant inbred rice population and two backcross populations"

Reference ID

9467

Title

Gene actions of QTLs affecting several agronomic traits resolved in a recombinant inbred rice population and two backcross populations

Source

Theor Appl Genet, 2005, vol. 110, pp. 649-659

Authors (8)

Mei-H-W	Li-Z-K
Shu-Q-Y	Guo-L-B
Wang-Y-P	Yu-X-Q
Ying-C-S	Luo-L-J

Abstract

To understand the types of gene action controlling seven quantitative traits
in rice, we carried out quantitative trait locus (QTL) mapping in order to
distinguish between the main-effect QTLs (M-QTLs) and digenic epistatic QTLs
(E-QTLs) responsible for the trait performance of 254 recombinant inbred lines
(RILs) from rice varieties Lemont/Teqing and two backcross hybrid (BCF1)
populations derived from these RILs. We identified 44 M-QTL and 95 E-QTL pairs
in the RI and BCF1 populations as having significant effects on the mean
values and mid-parental heterosis of heading date, plant height, flag leaf
length, flag leaf width, panicle length, spikelet number and spikelet
fertility. The E-QTLs detected collectively explained a larger portion of the
total phenotypic variation than the M-QTLs in both the RI and BCF1
populations. In both BCF1 populations, over-dominant (or under-dominant) loci
were more important than additive and complete or partially dominant loci for
M-QTLs and E-QTL pairs, thereby supporting prior findings that overdominance
resulting from epistatic loci are the primary genetic basis of inbreeding
depression and heterosis in rice.