Growth impact of O3, NO2 and/or SO2 on Platanus occidentalis
1982
Kress, L.W. | Kelly, J.m. (Virginia Polytechnic Inst. and State Univ., Blacksburg (USA). Dept. of Plant Pathology and Physiology) | Hinkelmann, K.H.
Seedlings of two half-sub families of American sycamore were exposed to 0.05 ppm O(,3), 0.10 ppm NO(,2), and/or 0.14 ppm SO(,2) for 6 h/day for 28 consecutive days. The treatments were O(,3), NO(,2), SO(,2) (each used alone), O(,3) + SO(,2), O(,3) + NO(,3), and O(,3) + NO(,2) + SO(,2). Significant growth suppressions were noted for both families when exposed to O(,3) + SO(,2) or O(,3) + SO(,2) + NO(,2). The O(,3) + SO(,2) treatment had a more significant effect than O(,3) alone, and adding NO(,2) to the O(,3) + SO(,2) treatment further suppressed height growth significantly. A 45% and 34% growth suppression was observed for the two families (16-Syc-19 and 16-Syc-23), respectively, in response to the three pollutants in combination. The height growth of both families was significantly suppressed by O(,3) alone in some cases. Both families exhibited significant height growth recovery 2 weeks after removal of the pollutant stress. Pollution-induced foliar injury was never evident on the seedlings.
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