caa a22 4500 397520840 CHVBK 20180308164632.0 cr unu---uuuuu 161202e199509 xx s 000 0 eng 10.1093/jxb/46.9.1223 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.9.1223 The uptake of and structural changes induced by trichloroacetic acid in the needles of Scots pine seedlings [Elektronische Daten] [Sirkka Sutinen, Soile Juuti, Leena Koivisto, Minna Turunen, Juhani Ruuskanen] The uptake of trichloroacetic acid (TCA) and structural changes induced in the needles of Scots pine (Pinus sylvestris L.) seedlings were studied. Two exposure set-ups, a root route and an atmospheric route through the surfaces simulating the wet deposition of fog, were used. Both set-ups included two dose levels and corresponding control treatments. The temperature and the relative humidity in the climate chambers were adjusted to represent the conditions of June-July in a subarctic area in central Finland. The seedlings were exposed three times a week for two months. The results showed that the uptake of TCA in needles occurred both via roots and via needle surface. However, most of the TCA via the atmospheric route was absorbed on the surface of the needles. The structural responses in pine needles depended partly on the treatment method: TCA applied via the atmospheric route disintegrated the structures of the epicuticular waxes and that of the stomatal cells, which was not seen in the exposures via roots. A common feature was the decrease in size of the chloroplasts in concert with the increasing TCA concentrations inside the needles. © Oxford University Press RESEARCH PAPERS nationallicence Pinus sylvestris L nationallicence climate chamber nationallicence effects nationallicence microscopic structure nationallicence secondary pollutant nationallicence TCA nationallicence trichloroacetic acid nationallicence Sutinen Sirkka Finnish Forest Research Institute, Suonenjoki Research Station Juntintie 40, Fin-77600 Suonenjoki, Finland aut Juuti Soile Department of Environmental Sciences, University of Kuopio PO Box 1627, Fin-70211 Kuopio, Finland aut Koivisto Leena Finnish Forest Research Institute, Suonenjoki Research Station Juntintie 40, Fin-77600 Suonenjoki, Finland aut Turunen Minna Arctic Centre, University of Lapland PO Box 122, Fin-96101 Rovaniemi, Finland aut Ruuskanen Juhani Department of Environmental Sciences, University of Kuopio PO Box 1627, Fin-70211 Kuopio, Finland aut Journal of Experimental Botany Oxford University Press 46/9(1995-09), 1223-1231 0022-0957 46:9<1223 1995 46 exbotj https://doi.org/10.1093/jxb/46.9.1223 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.9.1223 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sutinen Sirkka Finnish Forest Research Institute, Suonenjoki Research Station Juntintie 40, Fin-77600 Suonenjoki, Finland aut NATIONALLICENCE 700 1- Juuti Soile Department of Environmental Sciences, University of Kuopio PO Box 1627, Fin-70211 Kuopio, Finland aut NATIONALLICENCE 700 1- Koivisto Leena Finnish Forest Research Institute, Suonenjoki Research Station Juntintie 40, Fin-77600 Suonenjoki, Finland aut NATIONALLICENCE 700 1- Turunen Minna Arctic Centre, University of Lapland PO Box 122, Fin-96101 Rovaniemi, Finland aut NATIONALLICENCE 700 1- Ruuskanen Juhani Department of Environmental Sciences, University of Kuopio PO Box 1627, Fin-70211 Kuopio, Finland aut NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/9(1995-09), 1223-1231 0022-0957 46:9<1223 1995 46 exbotj Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford