Activity of granule-bound starch synthase is an important determinant of amylose content in rice endosperm

被引：56

作者：

Umemoto, T ^{[1
]}

Terashima, K

机构：

[1] Natl Inst Crop Sci, Tsukuba, Ibaraki 3058518, Japan

[2] Natl Agr Res Org, Tsukuba, Ibaraki 3058517, Japan

来源：

FUNCTIONAL PLANT BIOLOGY | 2002年 / 29卷 / 09期

关键词：

D O I：

10.1071/PP01145

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Effects of temperature on amylose synthesis in rice endosperm were investigated using 13 cultivars known to differ in amylose contents in endosperm. Both amylose content and granule-bound starch synthase (GBSS) activity was increased when endosperms were developed under lower temperature in low- and medium-amylose cultivars, while this was not the case for high-amylose cultivars. Amylose content in high-amylose cultivars was stable under different temperature, with varying GBSS activity. A nearly linear correlation between GBSS activity and amylose content was observed as far as activity levels about 250 nmol min(-1) g(-1) DW. These results suggest that GBSS activity is an important determinant of amylose content in endosperm of low- and medium-amylose cultivars, while factors other than the enzyme activity limit amylose synthesis in the high-amylose cultivars.

引用

页码：1121 / 1124

页数：4

共 27 条

[1] Microsatellites and a single-nucleotide polymorphism differentiate apparent amylose classes in an extended pedigree of US rice germ plasm [J].