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Annals of Botany 39: 605-610, 1975
© 1975 Annals of Botany Company

RESEARCH-ARTICLE

Fine Structural Studies on the Pycnidiospores of Botryodiplodia theobromae Pat.

AGNES E. UDUEBO

Department of Biological Sciences, University of Lagos Lagos, Nigeria

Received: 6 June 1974   

The structure of the pycnidiospores of B. theobromae was investigated by a combination of light microscope, a scanning electron microscope and a transmission electron microscope observations. As observed with the light microscope the hyaline non-septate pycnidiospore is highly vesiculated while the pigmented septate one exhibits longitudinal hyaline striations. Investigations with the scanning electron microscope showed the hyaline non-septate pycnidiospore to be smooth-walled without any form of ornamentation. The pigmented septate pycnidiospore on the other hand had a rough outer surface with a transverse groove, which probably indicated the position of the septum. The longitudinal striations seen on such pycnidiospores with the light microscope were not observed under these conditions. Observations with the transmission electron microscope showed that the outermost layer of the hyaline pycnidiospore was smoother than that of the pigmented one. The pigment was on the outer layer of the double-layered wall of the pigmented pycnidiospore. The inner non-pigmented wall layer was continuous with the septum. The septum tapered gradually to a thin layer in the centre where it was perforated by a simple pore. The observations indicated that the pigmented spore was multinucleate while the hyaline one was uninucleate.


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