Sie können Bookmarks mittels Listen verwalten, loggen Sie sich dafür bitte in Ihr SLUB Benutzerkonto ein.
Medientyp:
E-Artikel
Titel:
Metabolic Basis for Injury to Plants from Combinations of O₃ and SO₂: Studies with Modifiers of Pollutant Toxicity
Beteiligte:
Olszyk, David M.;
Tingey, David T.
Erschienen:
American Society of Plant Physiologists, 1985
Erschienen in:Plant Physiology
Sprache:
Englisch
ISSN:
0032-0889;
1532-2548
Entstehung:
Anmerkungen:
Beschreibung:
<p>
Pisum sativum L. cv Alsweet (garden pea) and Lycopersicon esculentum Mill. flacca (mutant tomato) were chosen to evaluate the metabolic basis for plant injury from combinations of O<sub>3</sub> + SO<sub>2</sub>. The plants were exposed under conditions reported to specifically alter O<sub>3</sub> or SO<sub>2</sub> toxicity; light versus dark exposures, and treatment with the fungal metabolite fusicoccin (FC), the O<sub>3</sub> injury inhibitor N-[2-(2-oxo-1-imidazolidiny)ethyl]-N′-phenylurea (EDU), and the SO<sub>2</sub> injury stimulator diethyldithiocarbamate (DDTC). Plants were grown in controlled environment chambers and exposed to combinations of O<sub>3</sub> (0.05-0.2 microliters per liter) and SO<sub>2</sub> (0.1-0.3 microliters per liter) for 2 hours. Peas treated with FC had the same or greater injury (quantified by visual rating) with O<sub>3</sub> + SO<sub>2</sub> exposures compared to plants not treated with FC. For plants with open stomata in the dark as well as light, i.e. FC-treated peas and tomatoes, there was no change or an increase in foliar necrosis with O<sub>3</sub> + SO<sub>2</sub> exposures in the dark versus light. Peas treated with EDU had an almost complete absence of O<sub>3</sub> injury, no change in SO<sub>2</sub> injury, and moderate decreases in injury from combinations of O<sub>3</sub> + SO<sub>2</sub> compared to plants not treated with EDU. Tomatoes treated with DDTC showed the same or less injury compared to plants not treated with DDTC and exposed to O<sub>3</sub> or SO<sub>2</sub>. The plant responses to the experimental treatments and O<sub>3</sub> + SO<sub>2</sub> resembled O<sub>3</sub> responses more than SO<sub>2</sub> responses. The evidence for O<sub>3</sub>-like responses are: no change or increase in injury in the light versus dark, and EDU-induced decreases in injury. Evidences for SO<sub>2</sub>-like responses are: incomplete protection from injury with EDU, and no change or increased injury to FC-treated versus untreated plants. Thus, a metabolic mechanism affected by both pollutants may be associated with the combination injury, e.g. effects the plasma membrane.
</p>