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Starch structure and functionality have a significant impact on the utilization of cereal grains as food and feed. Starch viscosity characteristics are used to characterize rice cooking, processing and eating quality. In order to examine the genetics of viscosity characteristics, we developed molecular markers for five of the major enzymes involved in starch synthesis in the endosperm: granule bound...
The waxy gene, which encodes the granule bound starch synthase enzyme, is one of the key genes influencing starch synthesis in the rice endosperm. To investigate functional differences between GBSS alleles, we cloned and sequenced GBSS cDNA from a series of cultivars that differed substantially in apparent amylose content and starch viscosity characteristics. We found two single nucleotide polymorphisms...
Granule-bound starch synthase (GBSS), a product of the waxy gene in rice (Oryza sativa L.), is necessary for the synthesis of amylose in the endosperm. In an extended pedigree of 89 rice cultivars, we have previously shown that all cultivars with more than 18% amylose had the sequence AGGTATA at the leader intron 5′ splice site, while all cultivars with a lower proportion of amylose had the sequence...
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