Abstract
The creation of new triticale germplasm from its wheat and rye progenitors is an important source of potentially beneficial alleles. This research focused on the inheritance of glutenin and secalin alleles in triticale and their interaction in the hybrid offspring in terms of both subunit expression and gluten strength. Multiple crosses between five durum lines and two inbred rye lines were performed to create a set of 23 fertile amphidiploid lines. The SDS-PAGE banding patterns of the denatured HMW glutenins, LMW glutenins, HMW secalins and 75k γ-secalins (termed secaloglutenin) were compared to their exact parental plants, and their SDS-sedimentation was evaluated. Secaloglutenin subunits were simply inherited and expressed in all primary triticales. The few observed variations in banding patterns were accounted for within measured heterogeneity of the exact rye parental plants, for which the secalin alleles were thoroughly described. However, the possibility remains that mixed protein oligomers were formed between polymeric and monomeric storage proteins at the ultrastructure level. Furthermore, significant differences in the gluten strength of primaries derived from different durum parents were observed. This research suggests triticale of high gluten strength can be obtained by selection of parents with favourable glutenin alleles.
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Acknowledgments
This work is funded by the Grains Research and Development Corporation. Many thanks to Mike Sissons (DPI Tamworth) and Britt Kalmeier (AGT) for providing seed, and to Zhao Xiochun, Jeremy Roake, Hassan and Nizam Ahmed (University of Sydney), and Joop van Leur (DPI Tamworth) for their invaluable technical assistance.
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Dennett, A.L., Cooper, K.V. & Trethowan, R.M. The genotypic and phenotypic interaction of wheat and rye storage proteins in primary triticale. Euphytica 194, 235–242 (2013). https://doi.org/10.1007/s10681-013-0950-y
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DOI: https://doi.org/10.1007/s10681-013-0950-y