EDU and ozone protection: Foliar glycerolipids and steryl lipids in snapbean exposed to O sub 3
- USDA/Agricultural Research Service, Beltsville, MD (USA)
Effects of ethylene diurea (EDU) on foliar lipids in snapbeans before and after a single, acute ozone exposure were assessed. Systemic treatment with EDU slightly reduced membrane lipid content in the first trifoliate leaf. EDU conferred protection against ozone-induced necrosis. Leaves of untreated controls had lost ca 50% of both galacto- (GL) and phospholipids (PL) after a 3 hr exposure to 0.4 ppm O{sub 3}, whereas EDU-treated plants showed no significant loss of foliar GL and PL. A decline in the ratio of mono- to digalactosyl-diacylglycerol (MGDG/DGDG) was associated with the loss of GL, and a decline in the ratio of linoleic to linolenic acid (18:2/18:3) associated with the loss of PL, in untreated controls. The MGDG/DGDG ratio declined only slightly and the 18:2/18:3 ratio in PL increased during O{sub 3} exposure of EDU-treated seedlings. The level of total membrane sterols, including free sterols (FS), acylated steryl glycosides (ASG) and steryl glycosides (SG), did not change during O{sub 3} exposure of either treated or untreated plants. ASG and SG increased at the expense of FS, and the ratio of stigmasterol/sitosterol increased in ASG and SG in controls. In EDU-treated plants, a small increase in SG was offset by a decrease in FS, and there was no change in the stigmasterol/sitosterol ratio in ASG, SG or FS.
- OSTI ID:
- 5644977
- Report Number(s):
- CONF-9007196--
- Journal Information:
- Plant Physiology, Supplement; (United States), Journal Name: Plant Physiology, Supplement; (United States) Vol. 93:1; ISSN PPYSA; ISSN 0079-2241
- Country of Publication:
- United States
- Language:
- English
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