Genetic controls on starch amylose content in wheat and rice grains

Parviz Fasahat, Sadequr Rahman, Wickneswari Ratnam

    Research output: Contribution to journalReview ArticleResearchpeer-review

    18 Citations (Scopus)


    Starch accumulates in plants as granules in chloroplasts of source organs such as leaves (transitory starch) or in amyloplasts of sink organs such as seeds, tubers and roots (storage starch). Starch is composed of two types of glucose polymers: the essentially linear polymer amylose and highly branched amylopectin. The amylose content of wheat and rice seeds is an important quality trait, affecting the nutritional and sensory quality of two of the world's most important crops. In this review, we focus on the relationship between amylose biosynthesis and the structure, physical behaviour and functionality of wheat and rice grains. We briefly describe the structure and composition of starch and then in more detail describe what is known about the mechanism of amylose synthesis and how the amount of amylose in starch might be controlled. This more specifically includes analysis of GBSS alleles, the relationship between waxy allelic forms and amylose, and related quantitative trait loci. Finally, different methods for increasing or lowering amylose content are evaluated.

    Original languageEnglish
    Pages (from-to)279-292
    Number of pages14
    JournalJournal of Genetics
    Issue number1
    Publication statusPublished - Apr 2014


    • amylose content
    • biosynthesis
    • composition
    • rice
    • wheat

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