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NUTRITIONAL COMPARISONS IN THE LEPTOMITALES
Author(s) -
Gleason Frank H.
Publication year - 1968
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1968.tb07461.x
Subject(s) - biology , asparagine , fructose , sucrose , biochemistry , proline , fermentation , food science , amino acid , sugar , alanine , leucine , aeration , ammonium , aspartic acid , ecology , organic chemistry , chemistry
Certain aspects of the nutrition of five genera in Leptomitales, an order of aquatic fungi, were investigated. Asparagine was an adequate nitrogen source for all of the fungi tested. Ammonium sulfate could replace asparagine as the nitrogen source in Mindeniella . No single carbon source would support growth in all of the Leptomitales. Apodachlya and Leptomitus were capable of hydrolyzing proteins and metabolizing amino acids, especially glutamate, proline, leucine, and alanine. Apodachlya, Araiospora , and Sapromyces utilized acetate, succinate, pyruvate and d (–) lactate. Leptomitus, Apodachlya , and Araiospora utilized l (+) lactate and succinate. Only Apodachlya metabolized malate. Three sugars, i.e., glucose, fructose, and sucrose, were excellent carbon sources for Mindeniella and Sapromyces . Both of these fungi were capable of growth and fermentation under anaerobic conditions. Utilization of these sugars was more restricted in Apodachlya, Leptomitus , and Araiospora . Each of the five genera is quite distinct physiologically. The order Leptomitales contains a spectrum of related organisms ranging from strongly fermentative to obligately aerobic. Apodachlya, Leptomitus , and Araiospora are obligately aerobic, while Sapromyces is facultatively fermentative. Mindeniella is strongly fermentative even when grown in media with aeration.