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High Molecular Weight Glutenin Subunit Composition of Indian Wheats and Their Relationships with Dough Strength

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Abstract

One hundred and seventy two wheat varieties including twenty-five durum wheat cultivars were evaluated for high molecular weight glutenin subunit (HMW-GS) composition using SDS-PAGE. The relationship between HMW-GS and sedimentation tests for dough strength was studied. Three alleles were present at the Glu-A1 locus, eight at Glu-B1 and two at Glu-D1 in bread wheat. The data indicated the prevalence of the Glu-A1b allele (63.5%) at the Glu-A1 and Glu-D1a (71.4%) at Glu-D1 loci. Three alleles, namely Glu-B1b (30.61%), Glu-B1c (25.85%) and Glu-B1i (34.00%) represented about 90% of the alleles at Glu-B1 locus. The combination of Glu-A1b, Glu-B1i and Glu-D1d alleles exhibited highest dough strength as measured by sedimentation value in comparison to other combinations (p<0.001). However, this combination was present only in 7% of the samples evaluated. In durum wheat, the null allele (Glu-A1c) was observed more frequently (76%) than the Glu-A1b allele (24%). Glu-B1f and Glu-B1e alleles represented equally (32% each). Protein subunits 13+16 and 6+8 were found correlated positively (p<0.05) with improved dough strength as compared to subunit 20 in durum wheat. This information can be a valuable reference for designing breeding programme for the improvement of bread and pasta making quality of bread and durum wheats, respectively in India.

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Correspondence to Sewa Ram.

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Ram, S. High Molecular Weight Glutenin Subunit Composition of Indian Wheats and Their Relationships with Dough Strength. J. Plant Biochem. Biotechnol. 12, 151–155 (2003). https://doi.org/10.1007/BF03263177

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Keywords

  • glutenin subunits
  • SDS-PAGE
  • sedimentation value
  • bread wheat
  • durum
  • dough strength