
TY  - JOUR
A1  - Umemoto, Takayuki 
A1  - Terashima, Kazuo 
T1  - <emph type="2">Research note</emph>: Activity of granule-bound starch synthase is an important determinant of amylose content in rice endosperm
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 2002
VL  - 29
IS  - 9
SP  - 1121
EP  - 1124
KW  - 
UR  - https://doi.org/10.1071/PP01145 
N2  - 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. 
ER  -

