Single-nucleotide polymorphisms in rice starch synthase IIa that alter starch gelatinisation and starch association of the enzyme

Functional Plant Biology : FPB
Takayuki Umemoto, Noriaki Aoki

Abstract

The starch synthase IIa (SSIIa) gene of rice (Oryza sativa L.) has been shown to be the alk gene that controls alkali disintegration of rice grains, although the effects of naturally occurring alk mutant alleles on enzyme function have yet to be determined. We genotyped 60 rice cultivars for two single-nucleotide polymorphisms (SNPs) in rice SSIIa, including one that results in an amino acid substitution. Incorporating data for three other SNPs previously genotyped in rice SSIIa, five haplotypes were found. We analysed the association of these SSIIa haplotypes with the chain-length distribution of amylopectin, the gelatinisation temperature of rice flour, the alkali spreading score, and the starch association of the enzyme. It was determined that two SNPs resulting in amino acid changes close to the C-terminus most likely alter SSIIa both in terms of activity and starch granule association. This in turn alters the branch-length distribution of amylopectin and the gelatinisation properties of starch.

References

Apr 20, 2001·The Plant Journal : for Cell and Molecular Biology·P D Commuri, P L Keeling
Feb 13, 2003·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·T UmemotoY Nakamura
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Aug 1, 2004·Functional Plant Biology : FPB·Takayuki UmemotoSachio Maruyama

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Citations

Dec 8, 2006·The Biochemical Journal·Samuel C ZeemanAlison M Smith
Jan 8, 2011·Journal of the Science of Food and Agriculture·Chun-Ping WangMao-Qun Yu
Jun 18, 2014·Critical Reviews in Biotechnology·Wendy Chui Phing LauAdam Puteh
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