Summary
Two different cytochemical methods were used to study the localization of uricase (EC 1.7.3.3) and catalase (EC 1.11.1.6) in developing root nodules of soybean (Glycine max) inoculated as seeds withBradyrhizobium japonicum. One of the methods employs DAB (3,3′-diaminobenzidine) and detects uricase activity indirectly by coupling it to endogenous catalase activity. The other method utilizes cerium chloride to detect uricase activity directly. These methods were modified to obtain not only a strong staining reaction but also improved ultrastructural preservation. With the indirect DAB method, intense staining indicative of both uricase and catalase activity was obtained in the enlarged peroxisomes of older uninfected cells. Similar staining was observed in enlarging peroxisomes of younger uninfected cells, and in the material of associated sacs whose bounding membranes appear to arise as distensions of the ER. The observations are discussed in relation to the controversial role of the ER in peroxisome biogenesis. Although the small peroxisome-like organelles of infected cells did not give a clearly positive reaction in the indirect DAB method, they reacted positively in the cerium chloride method, and are considered to be peroxisomes.
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Abbreviations
- DAB:
-
3,3′-diaminobenzidine
- ER:
-
endoplasmic reticulum
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Kaneko, Y., Newcomb, E.H. Cytochemical localization of uricase and catalase in developing root nodules of soybean. Protoplasma 140, 1–12 (1987). https://doi.org/10.1007/BF01273250
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DOI: https://doi.org/10.1007/BF01273250