Effects of N2-O2 and CO2-O2 tensions on growth of fungi isolated from damaged flue-cured tobacco.
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 N(2)-O(2) or CO(2)-O(2). A 1 to 5% concentration of O(2) in an N(2) atmosphere caused the greatest change in growth of the nine species, and a 10 to 20% concentration of O(2) for A. flavus. All species, except A. amstelodami and A. ruber, grew faster in air than in mixtures containing 10% O(2). High O(2) concentrations generally inhibited furrow production in the mycelial mats. In an atmosphere of 5 to 40% O(2) in the N(2) atmosphere, furrows formed in mycelial mats between 5 and 40% O(2) in the species except for A. ruber, A. repens, and A. amstelodami, which produced none in any concentration. As O(2) decreased below 20%, spore production was progressively decreased, colony color faded to white, and cleistothecia formation was suppressed. In CO(2)-O(2) mixtures radial growth of all species increased with each quantitative decrease of CO(2). All species except A. niger grew faster in air than in 10% CO(2). In contrast to N(2)-O(2) mixtures, the fungi formed furrows, sporulation and cleistothecial formation were suppressed, and colony color changed to white in higher O(2) concentrations.
D001203:Ascomycota / Q000187:drug effects / Q000254:growth & development / Q000302:isolation & purification; D001230:Aspergillus / Q000187:drug effects / Q000254:growth & development / Q000302:isolation & purification; D002245:Carbon Dioxide / Q000494:pharmacology*; D004781:Environmental Exposure; D005658:Fungi / Q000187:drug effects* / Q000254:growth & development / Q000302:isolation & purification; D003904:Mitosporic Fungi / Q000187:drug effects / Q000254:growth & development / Q000302:isolation & purification; D009609:Nitrous Oxide / Q000494:pharmacology*; D010100:Oxygen / Q000494:pharmacology*; D010407:Penicillium / Q000187:drug effects / Q000254:growth & development / Q000302:isolation & purification; D010935:Plant Diseases; D010947:Plants, Toxic; D013170:Spores / Q000187:drug effects; D014026:Nicotiana
D002245:Carbon Dioxide; D009609:Nitrous Oxide; D010100:Oxygen