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Bowman-Birk soybean trypsin inhibitor (BBSTI) but not Kunitz soybean trypsin inhibitor (KSTI) was found in samples of undifferentiated and partially differentiated Amsoy 71 tissue culture callus. This suggests the differential metabolism of these two classes of proteinase inhibitors, whether the difference be in synthesis, in rates of degradation, or both. The differential metabolism of the proteinase inhibitors is also seen in the plant. Both BBSTI and KSTI were found in the hypocotyl, root, and epicotyl of the Amsoy 71 soybean seedling in addition to their expected presence in the cotyledons. Whereas the ratio of KSTI to BBSTI in the cotyledon was higher, the ratio of BBSTI to KSTI was higher in the extracotyledonary tissues of the seedling. The levels of both classes of proteinase inhibitors declined during seedling growth, except in the epicotyl and the proximal root. In both of these tissues, an increase in BBSTI, but not in KSTI content, expressed as milligrams inhibitor per plant part, occurred.

Differential Expression of Kunitz and Bowman-Birk Soybean Proteinase Inhibitors in Plant and Callus Tissue