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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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文献类型：外文期刊

作者： Clarke, B. ¹ ; Liang, R. ² ; Morell, M. K. ¹ ; Bird, A. R. ³ ; Jenkins, C. L. D. ¹ ; Li, Z. ¹ ;

作者机构： 1.CSIRO Plant Ind, Canberra, ACT 2601, Australia

2.Beijing Agrobiotechnol Res Ctr Beijing Acad Agr &, Beijing 100089, Peoples R China

3.CSIRO Hlth Sci & Nutr, Adelaide, SA 5000, Australia

关键词： Barley;Endosperm;Microarray;SsIIa mutant

期刊名称：FUNCTIONAL & INTEGRATIVE GENOMICS （影响因子：3.41；五年影响因子：3.616 ）

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年卷期：

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收录情况： SCI

摘要： 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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