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Figure 1.
Electron micrograph showing the cytochemical
localization of uricase in a peroxisome in mature cowpea nodules (from
Fig. 3 in Webb and Newcomb, 1987; reprinted with permission). The
intense staining of the peroxisome in the uninfected cell is the result
of treatment with 3,3'-diaminobenzidine plus urate. Peroxisomes in
infected cells of mature cowpea nodules do not contain uricase and do
not show this dark staining (Webb and Newcomb, 1987). × 13,000;
bar = 1 µm. M, Mitochondrion; N, nucleus; P, peroxisome; St,
starch-containing plastid.
