Reference "Mapping quantitative trait loci for grain appearance traits of rice using a recombinant inbred line population"

Reference ID

7834

Title

Mapping quantitative trait loci for grain appearance traits of rice using a recombinant inbred line population

Source

Acta. Bot. Sinica, 2001, vol. 43(8), pp. 840-845

Authors (5)

Xing-Y-Z	Tan-Y-F
Xu-C-G	Hua-J-P
Sun-X-L

Abstract

A linkage map consisting of 221 markers was constructed based on a recombinant
inbred line (RIL) population from the cross between Zhenshan 97 and Minghui 63.
Quantitative trait loci (QTL) mapping was carried out for grain appearance
traits such as grain length, grain width and grain shape in rice in 1998 and
1999. Based on interval mapping method at the threshold LODgtoreq2.4, six, two
and two QTLs were detected for grain length, grain width and grain shape,
respectively, in 1998; In 1999, three, two and two QTLs were identified for the
three traits, respectively. Of them, seven QTLs were simultaneously identified
in both of the years. The QTL with large effects located in the interval RG393 -
C1087 on chromosome 3 not only controlled the grain length, but also influenced
the grain shape. It explained 57.5%, 61.4% and 26.7%, 29. 9% of phenotypic
variation of the grain length and the grain shape in two years, respectively.
The QTL with large effects located in the interval RG360 - C734B on chromosome 5
affected the grain width and the grain shape. It explained 44.2%, 53.2% and
32.1%, 36.0% of phenotypic variation of the grain width and the shape in two
years, respectively. Eight, five and five QTLs were identified for the grain
length, width and shape, respectively, based on mixed linear-model composite
interval mapping method at P = 0.005. Their general contributions were 58.81%,
44.75%, and 57.47%. One QTL for the grain length was found to be significant
interaction with environment.