Antigenic similarity among Anabaena azollae separated from different species of Azolla |
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Authors: | J K Ladha I Watanabe |
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Institution: | Department of Soil Microbiology, The International Rice Research Institute, Los Baños, Laguna, Philippines |
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Abstract: | Direct fluorescent antibody (FA) reaction results of 5 FAs against symbiotic Anabaena azollae indicated that all the A. azollae freshly separated from 32 specimens of Azolla collected worldwide (belonging to 6 different species) shared identical and highly specific antigens. None of these FAs exhibited cross-reaction with any of the free-living blue-green algae tested. FA absorption results confirmed these results and also indicate the existence of cross-reactive antigens between Azolla leaves and the surfaces of A. azollae. Antibodies made against free-living A. azollae did not cross-react with any of the symbiotic A. azollae indicating either: (i) these isolates are not true isolates, or (ii) their antigenic properties were altered during isolation and culturing. Such possibilities and their implications are discussed. |
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