TABLE 1.

Occurrence of the ability of yeast species to grow on δ-gluconolactone or sodium gluconate according to the standard taxonomic assimilation tests

Group	Growth phenotype in assimilation test		No. of strainsa	Example
	δ-Gluconolactone	Sodium gluconate
I	Negative	Negative	90	Kluyveromyces wickerhamii
II	Negative	Positive	13	Candida curiosa
III	Positive	Negative	48	Saccharomyces bulderi (this study)
IV	Positive	Positive	147	Yarrowia lipolytica

^aData were obtained from a taxonomic handbook (2). Species that exhibit a weak, variable, or delayed response in assimilation tests for these two substrates are not included in this table.