Research note: Activity of granule-bound starch synthase is an important determinant of amylose content in rice endosperm.
Funct Plant Biol
; 29(9): 1121-1124, 2002 Aug.
Article
em En
| MEDLINE
| ID: mdl-32689564
ABSTRACT
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.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2002
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Article