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Ten fungi,Aspergillus niger, A. flavus, A. ochraceus, A. ruber, A. repens, A. amstelodami, Alternaria tenuis, Penicillium brevi-compactum, Cladosporium herbarum , andChaetomium 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 forA. flavus . All species, exceptA. amstelodami andA. 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 forA. ruber, A. repens , andA. 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 exceptA. 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.

Effects of N 2 -O 2 and CO 2 -O 2 Tensions on Growth of Fungi Isolated from Damaged Flue-Cured Tobacco

Effects of N ₂ -O ₂ and CO ₂ -O ₂ Tensions on Growth of Fungi Isolated from Damaged Flue-Cured Tobacco