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The ZmST1;1 cDNA was expressed in the yeast (Saccharomyces cerevisiae) sulfate transporter mutant CP154-7A. Kinetic analysis of sulfate uptake isotherm, determined on complemented yeast cells, revealed that ZmST1;1 has a high affinity for sulfate (Km value of 14.6 \u00b1 0.4 \u03bcm). Cd, Zn, and Cu exposure increased both ZmST1;1 expression and root sulfate uptake capacity. The metal-induced sulfate uptakes were accompanied by deep alterations in both thiol metabolism and levels of compounds such as reduced glutathione (GSH), probably involved as signals in sulfate uptake modulation. Cd and Zn exposure strongly increased the level of nonprotein thiols of the roots, indicating the induction of additional sinks for reduced sulfur, but differently affected root GSH contents that decreased or increased following Cd or Zn stress, respectively. Moreover, during Cd stress a clear relation between the ZmST1;1 mRNA abundance increment and the entity of the GSH decrement was impossible to evince. Conversely, Cu stress did not affect nonprotein thiol levels, but resulted in a deep contraction of GSH pools. Our data suggest that during heavy metal stress sulfate uptake by roots may be controlled by both GSH-dependent or -independent signaling pathways. Finally, some evidence suggesting that root sulfate availability in Cd-stressed plants may limit GSH biosynthesis and thus Cd tolerance are discussed.<\/jats:p>","DOI":"10.1104\/pp.105.076240","type":"journal-article","created":{"date-parts":[[2006,5,12]],"date-time":"2006-05-12T20:43:23Z","timestamp":1147466603000},"page":"1138-1148","source":"Crossref","is-referenced-by-count":184,"title":["Heavy Metal Stress and Sulfate Uptake in Maize Roots"],"prefix":"10.1093","volume":"141","author":[{"given":"Fabio F.","family":"Nocito","sequence":"first","affiliation":[{"name":"Dipartimento di Produzione Vegetale, Universita\u0300 degli Studi di Milano, 20133 Milan, Italy (F.F.N., C.L., B.C., G.A.S.); and Biochimie and Physiologie Mole\u0301culaire des Plantes, Institut National de la Recherche Agronomique (Unite\u0301 386), Centre National de la Recherche Scientifique (Unite\u0301 Mixte de Recherche 5004), Ecole Nationale Supe\u0301rieure Agronomique de Montpellier, Universite\u0301 Montpellier 2,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clarissa","family":"Lancilli","sequence":"additional","affiliation":[{"name":"Dipartimento di Produzione Vegetale, Universita\u0300 degli Studi di Milano, 20133 Milan, Italy (F.F.N., C.L., B.C., G.A.S.); and Biochimie and Physiologie Mole\u0301culaire des Plantes, Institut National de la Recherche Agronomique (Unite\u0301 386), Centre National de la Recherche Scientifique (Unite\u0301 Mixte de Recherche 5004), Ecole Nationale Supe\u0301rieure Agronomique de Montpellier, Universite\u0301 Montpellier 2,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Barbara","family":"Crema","sequence":"additional","affiliation":[{"name":"Dipartimento di Produzione Vegetale, Universita\u0300 degli Studi di Milano, 20133 Milan, Italy (F.F.N., C.L., B.C., G.A.S.); and Biochimie and Physiologie Mole\u0301culaire des Plantes, Institut National de la Recherche Agronomique (Unite\u0301 386), Centre National de la Recherche Scientifique (Unite\u0301 Mixte de Recherche 5004), Ecole Nationale Supe\u0301rieure Agronomique de Montpellier, Universite\u0301 Montpellier 2,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pierre","family":"Fourcroy","sequence":"additional","affiliation":[{"name":"Dipartimento di Produzione Vegetale, Universita\u0300 degli Studi di Milano, 20133 Milan, Italy (F.F.N., C.L., B.C., G.A.S.); and Biochimie and Physiologie Mole\u0301culaire des Plantes, Institut National de la Recherche Agronomique (Unite\u0301 386), Centre National de la Recherche Scientifique (Unite\u0301 Mixte de Recherche 5004), Ecole Nationale Supe\u0301rieure Agronomique de Montpellier, Universite\u0301 Montpellier 2,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jean-Claude","family":"Davidian","sequence":"additional","affiliation":[{"name":"Dipartimento di Produzione Vegetale, Universita\u0300 degli Studi di Milano, 20133 Milan, Italy (F.F.N., C.L., B.C., G.A.S.); and Biochimie and Physiologie Mole\u0301culaire des Plantes, Institut National de la Recherche Agronomique (Unite\u0301 386), Centre National de la Recherche Scientifique (Unite\u0301 Mixte de Recherche 5004), Ecole Nationale Supe\u0301rieure Agronomique de Montpellier, Universite\u0301 Montpellier 2,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gian Attilio","family":"Sacchi","sequence":"additional","affiliation":[{"name":"Dipartimento di Produzione Vegetale, Universita\u0300 degli Studi di Milano, 20133 Milan, Italy (F.F.N., C.L., B.C., G.A.S.); and Biochimie and Physiologie Mole\u0301culaire des Plantes, Institut National de la Recherche Agronomique (Unite\u0301 386), Centre National de la Recherche Scientifique (Unite\u0301 Mixte de Recherche 5004), Ecole Nationale Supe\u0301rieure Agronomique de Montpellier, Universite\u0301 Montpellier 2,"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2006,5,12]]},"reference":[{"key":"2021050612433988600_R1","doi-asserted-by":"crossref","unstructured":"Bolchi A, Petrucco S, Tenca PL, Foroni C, Ottonello S (1999) Coordinate modulation of maize sulphate permease and ATP sulfurylase mRNAs in response to variations in sulfur nutritional status: stereospecific down-regulation by L-cysteine. 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