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Gene expression in a starch synthase IIa mutant of barley: changes in the level of gene transcription and grain composition

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Abstract

The barley shrunken grain mutant M292 has a novel high-amylose starch phenotype caused by a mutation in the starch synthase IIa gene (SsIIa) located at the starch excess-6 (sex6) locus on chromosome 7H of barley. The loss of SSIIa enzyme activity leads to a decrease in amylopectin synthesis to less than 20% of the levels found in wild-type grains. Detailed composition analysis indicates that the contents of protein, non-starch polysaccharides, lipid, sucrose and hexoses, and fructo-oligosaccharides are increased in mature M292 grain compared to wild type. Using a microarray analysis, we characterize the differences between the transcription profiles of wild-type and mutant barley endosperms at mid-grain fill. The expression changes include genes involved in carbon storage, stress-related genes, and a number of transcripts with unassigned function. The changes in gene expression are discussed in terms of the altered grain composition of the mutant seed.

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Authors and Affiliations

  1. CSIRO Plant Industry, GPO, Box 1600, Canberra, ACT, 2601, Australia

    B. Clarke, M. K. Morell, C. L. D. Jenkins & Z. Li

  2. Bei**g Agro-Biotechnology Research Center Bei**g Academy of Agriculture & Forest Science, Ban**g Cun, Haidian District, Bei**g, 100089, China

    R. Liang

  3. CSIRO Health Sciences and Nutrition, Kintore Avenue, Adelaide, SA, 5000, Australia

    A. R. Bird

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  1. B. Clarke
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  2. R. Liang
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  3. M. K. Morell
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  4. A. R. Bird
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  5. C. L. D. Jenkins
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  6. Z. Li
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Correspondence to B. Clarke.

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Clarke, B., Liang, R., Morell, M.K. et al. Gene expression in a starch synthase IIa mutant of barley: changes in the level of gene transcription and grain composition. Funct Integr Genomics 8, 211–221 (2008). https://doi.org/10.1007/s10142-007-0070-7

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  • DOI: https://doi.org/10.1007/s10142-007-0070-7

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