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- W1970889574 abstract "Abstract The body of information presented in this paper is directed to plant scientists who are concerned with factors which modify the susceptibility of plants to air pollutants. Tobacco and tomato plants grown in sand-solution culture with varying levels of nitrogen or sulfur were exposed to injurious levels of sulfur dioxide. Plants of both species which were deficient in either nutrient exhibited decreased susceptibility to the gas compared with plants grown at optimal levels of each nutrient. Foliage of these plants was also found to have increased stomatal resistance as measured by a porometer and decreased total sulfur accumulations. Plants grown at optimum levels of each nutrient showed increased susceptibility over that of the deficient plants. Stomatal resistance was lower and sulfur accumulation was greater than in the deficient plants. At the supra-optimal nitrogen and sulfur levels, there were differences in susceptibility. Over-abundant nitrogen appeared to decrease susceptibility whereas over-supplies of sulfur increased it. The response of plants with deficient or optimal supplies of either nutrient might be explained by the effects of nutrition on stomatal activity and hence on ability to absorb SO2S from the atmosphere, mineral deficiency being known to increase stomatal resistance, and mineral sufficiency, to decrease stomatal resistance by virtue of increased efficiency of water use. The difference in response between plants overfertilized with respect to nitrogen or sulfur is explained by the fact that sulfur is both nutrient and phytotoxicant at the same time. Having already been oyersupplied with sulfur by absorption from the nutrient substrate, the high-sulfur plants were unable to withstand additional sulfur accumulation from the atmosphere and hence were more severely injured. Increased carbohydrate accumulation in the nitrogen- and sulfur-deficient plants might play an additional role in protection from SO2-injury." @default.
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- W1970889574 date "1972-07-01" @default.
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- W1970889574 title "Modification of Sulfur Dioxide Injury to Tobacco and Tomato by Varying Nitrogen and Sulfur Nutrition" @default.
- W1970889574 doi "https://doi.org/10.1080/00022470.1972.10469677" @default.
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