Abstract
The fine structure of conidia, hyphae, and of isolated haustoria of cucumber mildew (Sphaerotheca fuliginea) was studied. Large vacuoles are present in the spores and hyphae. Rosette-shaped particles, presumably glycogen, occur in the spores. Certain haustoria were found which lack the protrusions of the central body of mature haustoria. Most probably these haustoria are young and not yet fully developed. Portion of the sheath membrane of these haustoria is in close contact with the central body wall. The observations suggest that the haustorial sheath membrane is formed as a specialized portion of the haustorial body wall. Presumably the formation of the sheath membrane precedes the formation of the sheath and that of the protrusions of the central body.
Samenvatting
Er werd een onderzoek verricht naar de submicroscopische structuur van conidia, hyphen en haustoriën, geïsoleerd uit komkommerbladeren die geïnfecteerd waren met echte meeldauw (Sphaerotheca fuliginea). Sporen en hyphen bevatten grote vacuolen. In de conidiën werden rozetachtige deeltjes, waarschijnlijk glycogeen, gevonden. Er werden ook haustoriën gevonden, waarbij de normaal voorkomende uitstulpingen van het centrale lichaam in volwassen haustoriën ontbraken. Bij deze waarschijnlijk jonge haustoriën is een gedeelte van de schedemembraan in nauw contact met de wand van het centrale lichaam. Deze resultaten doen vermoeden dat de schedemembraan gevormd wordt als een speciaal gedeelte van de wand van het centrale lichaam. Waarschijnlijk scheidt de membraan zich daarna van het centrale lichaam bij de vorming van de schede. Verondersteld wordt, dat de uitstulpingen van het centrale lichaam nà of tijdens de vorming van de schede ontstaan.
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The study has been carried out at the Laboratory of Phytopathology, State Agricultural University, Wageningen, in connection with the activities of TNO Research Unit for Internal Therapy of Plants.
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Dekhuijzen, H.M., Van der Scheer, C. The ultrastructure of powdery mildew, Sphaerotheca fuliginea, isolated from cucumber leaves. Netherlands Journal of Plant Pathology 75, 169–177 (1969). https://doi.org/10.1007/BF02137213
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DOI: https://doi.org/10.1007/BF02137213