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Ultrastructural localization of Kunitz inhibitor on thin sections of Glycine max (soybean) cv. Maple Arrow by the gold method

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Summary

The soybean trypsin inhibitor (SBTI, Kunitz type) was localized by immunofluorescence and, at the ultrastructural level, by the protein A gold method on thin sections of Glycine max (soybean) cv. Maple Arrow. SBTI was localized in cell walls, protein bodies, the cytoplasm between the lipid-containing spherosomes, and the nucleus of the cotyledon and embryonic axis. In the nucleus, SBTI was present in the chromatin deposit and the nucleolus. The intensity of marking by the gold method decreased in the cell wall from the center of the cotyledon to the periphery. In four-days-old seedlings marking intensity of cell wall was much reduced. No SBTI could be detected in the hypocotyl. In two lines lacking soybean agglutinin (Norredo, T-102) the location of SBTI was similar to that observed in Maple Arrow. In P.I. 196168, a line lacking SBTI, marking intensity of the organelles was reduced to a very low level. Although this study was not designed to discern the cellular function of SBTI, if any, it may establish criteria consistent with its role in soybean.

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Authors and Affiliations

  1. Research Department, Nestlé Products Technical Assistance Co. Ltd., P.O. Box 88, CH-1814, La Tour de Peilz, Switzerland

    M. Horisberger & M. Tacchini-Vonlanthen

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  1. M. Horisberger
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  2. M. Tacchini-Vonlanthen
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Horisberger, M., Tacchini-Vonlanthen, M. Ultrastructural localization of Kunitz inhibitor on thin sections of Glycine max (soybean) cv. Maple Arrow by the gold method. Histochemistry 77, 37–50 (1983). https://doi.org/10.1007/BF00496634

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  • DOI: https://doi.org/10.1007/BF00496634

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