Debaryomyces属の分類に関する一考察 : (第3報) Debaryomyces franciscae (Capriotti) nov. comb.

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This paper deals with a unique yeast culture isolated from sap of Citrus spec. by Tadakatsu Okada. Our taxonomic studies on this isolate (strain LKB D-3) recealed that it should be classified into genus Debaryomyces, since the spores are formed usually after heterogamous conjugation and have a warty wall which can be observed under both the optical microscope and the electron microscope. Among the species belonging to the genus Debaryomyces hitherto reported, Deb. mandshuricus Naganishi seems to resemble the isolate in the fermentative pattern of sugars. On detailed observation, however, considerable differences mentioned below were found between them. i) In the assimilation of sorbitol and mannitol, it is positive for the strain D-3,negative for Deb. mandshuricus, whereas, in cellobiose and salicin as well as the splitting of arbutin, negative for the former, and positive for the latter. ii) The isolate does not require addtional vitamins for the growth in contrast to Deb. mandshuricus. iii) Remarkable difference in the maximum temperature for the growth ie 37-38℃ in the former, 41-42℃ in the latter. Further, if the spore morphology is not taken into consideration from the view point of taxonomy, the isolate agrees well with Saccharomyces pretoriensis Van der Walt et Tscheuschner in many properties. In the spore morphology however, there is a remarkable difference between both. That is, in the spore wall of the latter, no typical wartiness could be observed even under the electron microscope, as shown on Fig. IV. Therefore, it is of the author's opinion that the isolate should be considered as a separate species from S. pretoriensis. Also, our experimental results on a type culture of Torulaspora franciscae Capriotti CBS-2926 revealed that it closely resembles both S. pretoriensis and the isolate in many physiological properties. In addition, the ascospores of T. franciscae have a warty wall as shown on Fig. V. Eventually, the authours conluded that the isolate under discussion should be identified in Torulaspora franciscae Capriotti, the name of which, they wish to change to Debaryomyces franciscae (Capriotti) nov. comb. based predominantly on the remarkable characteristic of spore morphology mentioned above. A type culture of the isolate (LKB D-3←IFO 022) has been deposited in the Yeast Collection of the Centraalbureau voor Schimmelcultures (Delft, Holland).
社団法人日本生物工学会の論文
1964-01-15

Debaryomyces属の分類に関する一考察 : (第3報) Debaryomyces franciscae (Capriotti) nov. comb.

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