Symptom Expression and Free Sterol and Fatty Acid Composition of Flue-cured Tobacco Plants Exposed to Ozone

Abstract

Two flue-cured tobacco cultivars, North Carolina 88 and Coker 86, were concentration but a decrease in the concentration of free sterols and fumigated with 0 to 0.30 ppm ozone (03) for 6 hr. Both cultivars were highly triglyceride fatty acids in all leaf tissues. These changes were not correlated sensitive to 03. Plants fumigated with concentrations of 03 greater than with injury ratings. It is postulated that triglyceride fatty acids and other 0.15 ppm displayed typical weather fleck symptoms. Fumigation for 6 hr cellular components were being utilized for membrane repair. with 0.25 or 0.30 ppm 03 resulted in a significant increase in the lipid Genetic variability of ozone (03) sensitivity exists among and neutral-buffered KI (1). Fumigation chambers were illuminated

Climate Change and Crops

“…The effects of the pollutant on either the sterol concentration and composition have been early reported in several plants (Tomlinson and Rich 1971;Trevathan et al 1979;Grunwald and Endress 1985). In tobacco leaves, ozone fumigation enhances total lipid concentrations, but it decreases levels of FS and triglycerides (Trevathan et al 1979), whereas a higher amount of total phytosterols was reported in fumigated plants by other researchers (Menser et al 1977). Generally, exposure to high ozone concentrations (>12 L L −1 ) results in a decrease of free sterols (FS) and an increase in bound sterols (BS).…”

“…The effects of the pollutant on either the sterol concentration and composition have been early reported in several plants (Tomlinson and Rich 1971;Trevathan et al 1979;Grunwald and Endress 1985). The effects of the pollutant on either the sterol concentration and composition have been early reported in several plants (Tomlinson and Rich 1971;Trevathan et al 1979;Grunwald and Endress 1985).…”

Lipid Composition of Sonchus Yellow Net Virus

“…However, both animal viruses contain primarily cholesterol and cholesterol esters (McSharry & Wagner, 1971 ;Diringer et aL, 1973), while SYNV contains greater amounts of stigmasterol and fl-sitosterol than cholesterol. In tobacco leaves, cholesterol represents 5~ (Trevathan et al, 1979) to 10~ (Grunwald, 1975) of the individual sterols, but in isolated nuclear membranes the proportion of cholesterol reportedly varies from none (Philipp et al, 1976) to 90~ of the sterol fraction (Kemp & Mercer, 1968;Duperon et al, 1972). Therefore, with these discrepancies in mind, the presence of cholesterol in SYNV cannot be related to sites of assembly as has been done with some animal viruses (Compans & Klenk, 1979;Patzer et al, 1978).…”

Total Lipid, Free Sterol, Free Fatty Acid, and Triacylglycerol Fatty Acid Content of Tobacco Mosaic Virus-Infected Tobacco

“…1979). Methanolysis of triacylglycerols and preparation of free sterol and free fatty acid derivatives were done as described by Trevathan et al (1979) (Pirone 1979 Trevathan and Moore (1911) and is similar to that noted by Pirone and Davis (1977) with tobacco-vein-mottling virus, but differed from that reported by Richardson et al (1968) and Baur et al (1961), who found no effect of TMV on sterol content of Samsun tobacco. However, these authors initially hydrolyzed tobacco samples with 2 N HCI fbr 3 h, a Procedure which probably released bound sterols present as steryl glycosides (Bradford et (Matthews 1970).…”

“…1979). Methanolysis of triacylglycerols and preparation of free sterol and free fatty acid derivatives were done as described by Trevathan et al (1979). Samples…”