Zn2+-induced changes at the root level account for the increased tolerance of acclimated tobacco plants (Articolo in rivista)

Type
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  • Zn2+-induced changes at the root level account for the increased tolerance of acclimated tobacco plants (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1093/jxb/eru251 (literal)
Alternative label
  • Bazihizina N.; Taiti C.; Marti L.; Rodrigo-Moreno A.; Spinelli F.; Giordano C.; Caparrotta S.; Gori M.; Azzarello E.; Mancuso S. (2014)
    Zn2+-induced changes at the root level account for the increased tolerance of acclimated tobacco plants
    in Journal of experimental botany
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Bazihizina N.; Taiti C.; Marti L.; Rodrigo-Moreno A.; Spinelli F.; Giordano C.; Caparrotta S.; Gori M.; Azzarello E.; Mancuso S. (literal)
Pagina inizio
  • 4931 (literal)
Pagina fine
  • 4942 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84907382666&partnerID=q2rCbXpz (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 65 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 7 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 17 (literal)
Note
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • LINV, Department of Agrifood Production and Environmental Sciences, University of Florence, Viale delle Idee 30, 50019 Sesto F.no, Florence, Italy; Centro di Microscopie Elettroniche 'Laura Bonzi' (Ce.M.E.), ICCOM, CNR, Via Madonna del Piano, 50019 Sesto F.no, Florence, Italy (literal)
Titolo
  • Zn2+-induced changes at the root level account for the increased tolerance of acclimated tobacco plants (literal)
Abstract
  • [object Object]Evidence suggests that heavy-metal tolerance can be induced in plants following pre-treatment with non-toxic metal concentrations, but the results are still controversial. In the present study, tobacco plants were exposed to increasing Zn2+ concentrations (up to 250 and/or 500 ?M ZnSO4) with or without a 1-week acclimation period with 30 ?M ZnSO4. Elevated Zn2+ was highly toxic for plants, and after 3 weeks of treatments there was a marked (>=50%) decline in plant growth in non-acclimated plants. Plant acclimation, on the other hand, increased plant dry mass and leaf area up to 1.6-fold compared with non-acclimated ones. In non-acclimated plants, the addition of 250 ?M ZnSO4 led to transient membrane depolarization and stomatal closure within 24h from the addition of the stress; by contrast, the acclimation process was associated with an improved stomatal regulation and a superior ability to maintain a negative root membrane potential, with values on average 37% more negative compared with non-acclimated plants. The different response at the plasma-membrane level between acclimated and non-acclimated plants was associated with an enhanced vacuolar Zn2+ sequestration and up to 2-fold higher expression of the tobacco orthologue of the Arabidopsis thaliana MTP1 gene. Thus, the acclimation process elicited specific detoxification mechanisms in roots that enhanced Zn2+ compartmentalization in vacuoles, thereby improving root membrane functionality and stomatal regulation in leaves following elevated Zn2+ stress. (literal)
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