Abstract
The seeds of 19 sunflower species were compared on the basis of their protein contents and the relative proportions of their protein fractions. The globulin content varied from 50% to about 70% and the albumin content from 18% to 35% according to the species. The level of intermediateMr polypeptides showed a great variability (9.6 to 24.3%). Comparative studies onMr polymorphism were carried out by means of sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) of non reduced and/or reduced samples using both mono- and bidimensional procedures. Polypeptide constituents of helianthinin were compared including both number and molecular size (cultivatedH. annuus was used as a standard). Studies focused on differences observed between the major two α (Mr 38 000), α′ (Mr 32 000) and β (Mr 25 500), β′ (21 000) polypeptides families constituting the main A, B, and C subunits.α and α′ polypeptides analyses permit to discriminate easilyH. petiolaris from the other species. Charge polymorphism was studied using isoelectric focusing (IEF) and IEF-PAGE in mono and bidimensional procedures in the presence or absence of 2-mercaptoethanol (2-ME). Only a specific α4 polypeptide enables an easy discrimination betweenH. petiolaris and all the other species. Detailed nomenclature of the α, α′ and β, β′ polypeptides constituting the different helianthinin globulin subunits is given via the results of pI andMr analyses. Monodimensional IEF patterns of the more basic albumins (pI > 8.0) appear to provide a more valuable approach to identifying specific protein markers.
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Raymond, J., Robin, J.M. & Azanza, J.L. 11 S seed storage proteins fromHelianthus species (Compositae): Biochemical, size and charge heterogeneity. Pl Syst Evol 198, 195–208 (1995). https://doi.org/10.1007/BF00984737
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DOI: https://doi.org/10.1007/BF00984737