
%0 Journal Article
%A Umemoto, Takayuki 
%A Terashima, Kazuo 
%T <emph type="2">Research note</emph>: Activity of granule-bound starch synthase is an important determinant of amylose content in rice endosperm
%J Functional Plant Biology
%D 2002/07/20
%V 29
%N 9
%P 1121-1124
%K 
%R https://doi.org/10.1071/PP01145
%U https://www.publish.csiro.au/paper/PP01145 
%X 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. 
