Arbuscular Mycorrhizal fungi restore normal growth and alter polyamine content and gene expression in AL35 poplar clone grown on highly heavy metal contaminated soil

CICATELLI, ANGELA (2009) Arbuscular Mycorrhizal fungi restore normal growth and alter polyamine content and gene expression in AL35 poplar clone grown on highly heavy metal contaminated soil. [Tesi di dottorato] (Inedito)

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Abstract

Heavy metal (HM) pollution is a major worldwide environmental concern. Phytoremediation has become a promising remediation technique that include the use of selected plant species to remove or to stabilize a range of pollutants. Plant tolerance to HM stress is improved by arbuscular mycorrhizal (AM) fungi. Thus, suitable plant fungus combinations may contribute to the success of phytoremediation of HM polluted soil. Metallothioneins (MTs) and polyamines (PAs) are implicated in the response and tolerance to HM stress in several plant species, but whether the response is modulated by AM fungi remains to be clarified. Populus alba AL35 plants were grown in pots containing either soil collected from a HM polluted or unpolluted soil; they were pre-inoculated or not with Glomus mosseae or G. intraradices. At the first and the second growth season, the expression of MT and PA biosynthetic genes was analysed in leaves using quantitative RT-PCR, and free and conjugated foliar PA concentrations were detected. Results indicate that on polluted soil, AM fungi restored plant biomass despite higher Cu and Zn accumulation in plant organs. P. alba mycorrhizal plants exhibit increased capacity for stabilization of soil HMs, and improved stress tolerance through the transcriptional up-regulation of stress-related genes and the protective role of PAs.

Tipologia di documento:Tesi di dottorato
Parole chiave:Phytoremediation, Poplar, Arbuscular Mycorrhizal fungi
Settori scientifico-disciplinari MIUR:Area 05 Scienze biologiche > BIO/07 ECOLOGIA
Coordinatori della Scuola di dottorato:
Coordinatore del Corso di dottoratoe-mail (se nota)
Ricca, Ezio
Tutor della Scuola di dottorato:
Tutor del Corso di dottoratoe-mail (se nota)
Castiglione, Stefano scastiglione@unisa.it
Stato del full text:Accessibile
Data:27 Novembre 2009
Numero di pagine:90
Istituzione:Università degli Studi di Napoli Federico II
Dipartimento o Struttura:Chimica presso Università degli studi di Salerno
Tipo di tesi:Dottorato
Stato dell'Eprint:Inedito
Scuola di dottorato:Ecologia e microbiologia
Denominazione del dottorato:Biologia applicata
Ciclo di dottorato:XXII
Numero di sistema:3658
Depositato il:25 Marzo 2010 15:52
Ultima modifica:09 Settembre 2010 12:53

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