Electron microscope studies of oogonial wall and elemental composition of oogonia in Phytophthora
Tóm tắt
Scanning electron microscopy of oogonia of Phytophthora spp. showed that the oogonial wall was smooth in P. cactorum, P. citricola, P. heveae, and P. palmivora; finely granular in P. megasperma and P. megasperma var. sojae; and coarsely granular in P. parasitica. Transmission electron microscopy demonstrated that the oogonial wall in Phytophthora was composed of three layers with the middle layer being the least or the most electron dense. A coat of amorphous material was found on the entire outer surface of the oogonial wall. Elemental analysis of oogonia by means of a SEM electron probe microanalyzer revealed similar emission spectra among Phytophthora spp. with a characteristic peak for calcium.
Tài liệu tham khảo
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