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Variation of starch granule proteins and chromosome mapping of their coding genes in common wheat

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Abstract

Starch granule proteins (SGPs) of common wheat (Triticum aestivum L.) were analyzed by two electrophoretic techniques: sodium dodecyl sulphate polyacrylamide-gel electrophoresis (SDS-PAGE) and two-dimensional electrophoresis (2D-PAGE). These analyses identified three kinds of SGPs which were tentatively designated SGP-1, SGP-2 and SGP-3. SDS-PAGE resolved the products of three homoeologous genes for SGP-1 into three protein fractions, SGP-A1, -B1 and -D1. While SDS-PAGE resolved SGP-3 into one fraction, 2D-PAGE separated it into three protein fractions encoded by homoeologous genes Sgp-A3, B3 and -D3. SGP-2 was detected as one protein by SDS-PAGE and was present as one protein on 2D-PAGE. Aneuploid (nullisomic-tetrasomic and ditelosomic) analyses in the cultivar Chinese Spring showed that the genes for two SGPs (SGP-1 and -3) were located on the short arms of group-7 chromosomes. The results obtained from deletion lines for chromosome arms 7AS, 7BS and 7DS suggested that the gene order along the arms is ‘centromere-Sgp-1-Sgp-3-Wx’. An electrophoretic survey of wheat germ plasm identified a few cultivars lacking one of the proteins SGP-A1, -B1, -D1, SGP-A3 and -B3. The null alleles Sgp-A1b, Sgp-B1b and Sgp-D1b will be useful for the production of a variant wheat lacking SGP-1.

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Communicated by G. E. Hart

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Yamamori, M., Endo, T.R. Variation of starch granule proteins and chromosome mapping of their coding genes in common wheat. Theoret. Appl. Genetics 93, 275–281 (1996). https://doi.org/10.1007/BF00225757

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  • DOI: https://doi.org/10.1007/BF00225757

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