November
2001
Volume
78
Number
6
Pages
666
—
674
Authors
Yifang
Tan
,
1
,
2
Yongzhong
Xing
,
2
Qifa
Zhang
,
2
Mei
Sun
,
3
and
Harold
Corke
1
,
4
Affiliations
Cereal Science Laboratory, Department of Botany, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China.
National Key Laboratory for Crop Genetic Improvement, and Department of Agronomy, Huazhong Agricultural University, Wuhan 430070, China.
Population Genetics Laboratory, Department of Zoology, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China.
Corresponding author. E-mail: hcorke@yahoo.com Fax: +852 2858 3477.
Go to Article:
RelatedArticle
Accepted May 30, 2001.
Abstract
ABSTRACT
Gelatinization temperature of rice starch plays an important role in grain quality. We mapped eight loci responsible for the gelatinization parameters of rice: onset temperature (To), peak temperature (Tp), conclusion temperature (Tc) and enthalpy (ΔH) using a population of 242 recombinant inbred lines (RIL). Eight quantitative trait loci (QTL) were mapped onto the chromosome regions where starch-synthesis related genes are located. The Wx gene (granule-bound starch synthase [GBSS]), and the region of chromosome 11 played major roles in gelatinization trait determination; and other loci were starch-branching enzyme (SBE) genes that modify the two major loci by epistasis. High-level interactions were also detected indicating a trans mode of action of the genes. The genetic basis for these parameters was consistent with the relationship between the thermal properties and the structure of the starch granule. This information can be helpful for the improvement of starch-producing crops, including the improvement of rice grain quality, both for food and industrial uses.
JnArticleKeywords
ArticleCopyright
© 2001 by the American Association of Cereal Chemists, Inc.