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Annals of Botany 35: 175-182, 1971
© 1971 Annals of Botany Company

RESEARCH-ARTICLE

Fine Structure of Botrytis fabae Sardiña Conidia

D. V. RICHMOND and R. J. PRING

Long Ashton Research Station, University of Bristol

Received: 9 February 1970   

The fine structure of Botrytis fabae conidia was studied using a variety of electron-microscope techniques. The spore wall lacks conspicuous ornamentation and consists of microfibrils embedded in a granular matrix. The two distinct wall layers seen in chemically fixed sections cannot be detected in cross-fractured replicas; the two layers are probably structurally similar. The outer surface of the plasmalemma is covered with branched invaginations and two kinds of particles. Three distinct types of particles are present on the inner surface of the plasmalemma. In freeze-etched replicas nuclei, vacuoles, and other organelles always appear smoothly rounded. Small vesicles pass through the plasmalemma into the cell wall. Particles approximately 10 nm in diameter occur in compact rows on the cristae of cross-fractured mitochondria: dense spherical particles, probably of calcium phosphate, are present in chemically fixed mitochondria. Prevacuoles and vesicles with membranous inclusions can be seen in both cross-fractured replicas and chemically fixed sections. In cross-fractured replicas vacuoles and lipid bodies are frequently joined by strands of endoplasmic reticulum.


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