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Appl Environ Microbiol. 1970 February; 19(2): 271-277
Copyright © 1970 American Society for Microbiology. All Rights Reserved.

Effects of N2-O2 and CO2-O2 Tensions on Growth of Fungi Isolated from Damaged Flue-Cured Tobacco 1

H. Yang and G. B. Lucas

Department of Plant Pathology, School of Agriculture and Life Sciences, North Carolina State University, Raleigh, North Carolina 27607

ABSTRACT

Ten fungi, Aspergillus niger, A. flavus, A. ochraceus, A. ruber, A. repens, A. amstelodami, Alternaria tenuis, Penicillium brevi-compactum, Cladosporium herbarum, and Chaetomium dolicotrichum, were isolated from moldy flue-cured tobacco and grown in various mixtures of N2-O2 or CO2-O2. A 1 to 5% concentration of O2 in an N2 atmosphere caused the greatest change in growth of the nine species, and a 10 to 20% concentration of O2 for A. flavus. All species, except A. amstelodami and A. ruber, grew faster in air than in mixtures containing 10% O2. High O2 concentrations generally inhibited furrow production in the mycelial mats. In an atmosphere of 5 to 40% O2 in the N2 atmosphere, furrows formed in mycelial mats between 5 and 40% O2 in the species except for A. ruber, A. repens, and A. amstelodami, which produced none in any concentration. As O2 decreased below 20%, spore production was progressively decreased, colony color faded to white, and cleistothecia formation was suppressed. In CO2-O2 mixtures radial growth of all species increased with each quantitative decrease of CO2. All species except A. niger grew faster in air than in 10% CO2. In contrast to N2-O2 mixtures, the fungi formed furrows, sporulation and cleistothecial formation were suppressed, and colony color changed to white in higher O2 concentrations.

FOOTNOTES

1 Paper no. 2991 of the Journal Series of the North Carolina State University Experiment Station, Raleigh, N.C. 27607.

Appl Environ Microbiol. 1970 February; 19(2): 271-277
Copyright © 1970 American Society for Microbiology. All Rights Reserved.





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