Solutions to Some Problems in Aspergillus Taxonomy Using The Scanning Electron Microscope
Data obtained from a scanning electron microscope (SEM) study of intraspecific and interspecific variation in Aspergilli associated with post-harvest storage are used to resolve some difficulties in species identification and delimitation. Solutions are provided to problems of identifying isolates of Aspergillus flavus, A. parasíticus and A. oryzae, while the status of A. sojae is resolved. The morphological features of both the conidia and ascospores of A. glaucus are evaluated as marker characters and are shown to be equally useful either complimenting one another or acting indepedently. The long-standing, intricate puzzle surrounding A. melleus, A. quercinus and A. petrakii is explained satisfactorily. Finally, mycologists employing SEM techniques are warned of the wide variability that arises from the ontogenetic development of conidia, and cautioned to ensure that micrographs of mature conidia are obtained.
KeywordsOntogenetic Development Marker Character Conidium Size Conidial Head Spore Ornamentation
Unable to display preview. Download preview PDF.
- BLASER, P. 1976. Taxonomische und physiologische untersuchungen uber die Gattung Eurotium Link ex Fries. Sydowia 28: 1–49.Google Scholar
- COHN, F. 1884. Berichte uber die Tatigkeit der botanischen sektion der Schlesischen gesellschaft im Jahr 1883. Jber. schles. Ges. varterl. Kult. 61: 226–230.Google Scholar
- KOZAKIEWICZ, Z. 1982. The identity and typification of Aspergillus parasiticus. Mycotaxon 15: 293–305.Google Scholar
- NEHIRA, T. 1955. Sporulation of A. oryzae IV. Comparison of various media. J. Ferment. Technol., Osaka 33: 313–317.Google Scholar
- RAPER, K. B. and FENNELL, D. I. 1965. “The genus Aspergillus”. Baltimore: Williams and Wilkins.Google Scholar
- SAKAGUCHI, K. and YAMADA, K. 1944. Morphology and classification of koji moulds. Parts I and II. J. agric. Chem. Soc. Japan 20: 65–73, 141–154.Google Scholar
- SAMSON, R. A. 1979. A compilation of the Aspergilli described since 1965. Stud. Mycol., Baarn 18: 1–38.Google Scholar
- THOM, C. and CHURCH, M. B. 1926. “The Aspergilli.” Baltimore: Williams and Wilkins.Google Scholar
- THOM, C. and RAPER, K. B. 1945. “Manual of the Aspergilli.” Baltimore: Williams and Wilkins.Google Scholar