1887

Abstract

Increasing chromosome number of above the haploid level increased the yield of ethanol from -xylose. There was a large increment on going from the haplophase to the diplophase, and the highest yields were obtained with either a triploid or a probable tetraploid, depending on the concentration of -xylose. In addition, the rate of ethanol production from -xylose and -glucose increased, with the increment being larger on -xylose. On -galactose, the amount of ethanol produced within a given time also increased. The level of a by-product from -xylose, xylitol, decreased on going from a haploid to higher ploidy, but there was no discernible trend for two other by-products, acetic acid and arabinitol. Increasing ploidy increased growth rate on -galactose, but not appreciably on -xylose. The altered properties on D-xylose of the strains tested were not due to increased levels of either -xylose reductase or xylitol dehydrogenase, nor probably of alcohol dehydrogenase.

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/content/journal/micro/10.1099/00221287-129-8-2495
1983-08-01
2021-07-27
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