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Recently, we have cloned and characterized the enzyme sulphite oxidase (SO) from <jats:italic>Arabidopsis thaliana<\/jats:italic>. Yet, its physiological role remained unclear. Here, we describe results demonstrating that SO is essential for detoxifying excessive amounts of sulphite in the cell which is important for the survival of the plant. T\u2010DNA\u2010tagged <jats:italic>A. thaliana<\/jats:italic> plants lacking the enzyme showed a decrease in vitality during SO<jats:sub>2<\/jats:sub> fumigation and a change in their S\u2010metabolites. The same was found with RNA\u2010interference (RNAi) plants that were generated for tobacco. On the contrary, over\u2010expression of SO helped the plant to survive SO<jats:sub>2<\/jats:sub> concentrations that are detrimental for non\u2010transformed wild\u2010type (WT) plants, as was shown with poplar plants which are known to be particularly sensitive to SO<jats:sub>2<\/jats:sub>. Fumigation induced the expression of the enzyme as demonstrated by promoter\u2013reporter gene fusion, by immunoblot analysis of SO\u2010protein and by induction of enzyme activity. This implies that SO, as an otherwise constitutively expressed protein, is under additional control by SO<jats:sub>2<\/jats:sub> in the environment.<\/jats:p>","DOI":"10.1111\/j.1365-3040.2006.01632.x","type":"journal-article","created":{"date-parts":[[2007,1,22]],"date-time":"2007-01-22T18:55:46Z","timestamp":1169492146000},"page":"447-455","source":"Crossref","is-referenced-by-count":85,"title":["Sulphite oxidase as key enzyme for protecting plants against sulphur dioxide"],"prefix":"10.1111","volume":"30","author":[{"given":"CHRISTINA","family":"LANG","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"JENNIFER","family":"POPKO","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"MARKUS","family":"WIRTZ","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R\u00dcDIGER","family":"HELL","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"CORNELIA","family":"HERSCHBACH","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u00dcRGEN","family":"KREUZWIESER","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"HEINZ","family":"RENNENBERG","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"RALF R.","family":"MENDEL","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"ROBERT","family":"H\u00c4NSCH","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2007,1,22]]},"reference":[{"key":"e_1_2_7_2_1","first-page":"1159","article-title":"A new method for the ascorbic acid assay using iron(II)\u2010pyridine\u20102,6\u2010dicarboxylic acid complex","volume":"92","author":"Arya S.P.","year":"2002","journal-title":"Annali di Chimica"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0003-2697(76)90527-3"},{"key":"e_1_2_7_4_1","first-page":"339","volume-title":"Methods in Plant Biochemistry","author":"Brunold C.","year":"1990"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1399-3054.1983.tb04207.x"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-313x.1998.00343.x"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1104\/pp.98.2.738"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0014-5793(98)00150-1"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1074\/jbc.M108078200"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-94-015-9556-8_4"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/0006-3002(60)91525-0"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-8137.1977.tb01549.x"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-66544-8"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00425-003-1074-8"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1074\/jbc.M513054200"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0074-7696(08)62234-2"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1104\/pp.124.1.461"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1002\/j.1460-2075.1987.tb02730.x"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/0031-9422(94)00651-9"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/0031-9422(95)00406-W"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.1093\/treephys\/12.1.1"},{"key":"e_1_2_7_22_1","doi-asserted-by":"crossref","first-page":"266","DOI":"10.5344\/ajev.1992.43.3.266","article-title":"Radiotracer studies on the uptake and retention (conversion) of 35S\u2010sulfur dioxide in table grapes","volume":"43","author":"Lagunas\u2010Solar M.C.","year":"1992","journal-title":"American Journal of Enology and Viticulture"},{"key":"e_1_2_7_23_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00232166"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1055\/s-2004-815729"},{"key":"e_1_2_7_25_1","doi-asserted-by":"crossref","first-page":"360","DOI":"10.1515\/znc-1992-0607","article-title":"Superoxide dismutase and sulfite oxidation","volume":"47","author":"Miszalski Z.","year":"1992","journal-title":"Zeitschrift f\u00fcr Naturforschung"},{"key":"e_1_2_7_26_1","doi-asserted-by":"publisher","DOI":"10.1093\/oxfordjournals.pcp.a077370"},{"key":"e_1_2_7_27_1","doi-asserted-by":"publisher","DOI":"10.1093\/pcp\/pch212"},{"key":"e_1_2_7_28_1","unstructured":"PachmayrF.(1960)Vorkommen und Bestimmungen von Schwefel in Mineralwasser. 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