Effects of ozone on growth, lipid metabolism, and sporulation of fungi. [Colletotrichum lindemuthianum; Alternaria oleraceae]
Fumigations with ozone at concentrations of 10 pphm or more for 4 hr repeated daily for 4 days suppressed radial growth and spore production of Colletotrichum lindemuthianum, the most sensitive species studied. Neither radial nor mass growth of Alternaria oleraceae, a more tolerant species, was inhibited by 60 pphm ozone, although spore production was significantly accelerated. Since ozone did not affect spore viability, the inoculum potential was greatly enhanced. Histological effects of ozone included loss of pigmentation in C. lindemuthianum and abundant formation of light-refractive globules in the hyphae. Chemical analyses of mycelial mats showed an average 28% decrease in neutral lipid content of ozone-fumigated cultures. No differences were detectable in fatty acid composition of fumigated cultures. While some lipids may have leaked into the substrate, it was suspected that ozone penetrated into vital sites within the cell-oxidizing sulfhydryl groups, thereby suppressing lipid synthesis. The actual degree of suppression in fumigated hyphae may have been greater than indicated, since much of the mycelia analyzed grew within the substrate and was not directly subjected to ozone. 14 references.
- Research Organization:
- Univ. of Utah, Salt Lake City
- OSTI ID:
- 5603895
- Journal Information:
- Phytopathology; (United States), Vol. 59:9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FUNGI
GROWTH
SENSITIVITY
OZONE
TOXICITY
AIR POLLUTION
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
LIPIDS
METABOLISM
MYCELIUM
PIGMENTS
SPORES
BODY
ORGANIC ACIDS
ORGANIC COMPOUNDS
PLANT TISSUES
PLANTS
POLLUTION
TISSUES
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)