L’acido abscissico quale mediatore dell’attività antitraspirante ed antivirale del chiosano. (Comunicazione a convegno)

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  • L’acido abscissico quale mediatore dell’attività antitraspirante ed antivirale del chiosano. (Comunicazione a convegno) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Iriti M., Picchi V., Faoro F. (2008)
    L’acido abscissico quale mediatore dell’attività antitraspirante ed antivirale del chiosano.
    in Società Botanica Italiana, Riunione Annuale dei Gruppi di Lavoro, Fisciano (Salerno)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Iriti M., Picchi V., Faoro F. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • ABSCISIC ACID MEDIATES BOTH ANTITRANSPIRANT AND ANTIVIRAL ACTIVITY OF CHITOSAN Marcello Iriti, Valentina Picchi and Franco Faoro Istituto di Patologia Vegetale, Università di Milano, and Istituto di Virologia Vegetale, CNR, via Celoria 2, 20133 Milano Chitosan (CHT) is a natural compound able to activate the plant own defence machinery against pathogen attack and to reduce leaf transpiration. In this work, we have shown, for the first time, that both antitranspirant and antiviral activity of CHT are ABA mediated processes in bean plants. Twenty-four hours after foliar spraying with 0.15% CHT, ABA concentration raised over threefold in treated tissues. This induced partial stomatal closure via a H2O2-mediated process, as confirmed by SEM and histo-cytochemistry, and, in turn, a decrease of stomatal conductance to water vapour (Gw) and transpiration rate (E), assessed by gas exchange analysis. Interestingly, no differences were detected in maximal photochemical efficiency (Fv/Fm) between treated and untreated plants, and CHT antritranspirant activity was further confirmed by infrared thermography. In an other set of experiments, 0.15% CHT application elicited both callose apposition and ABA accumulation in leaf tissues, at 12 and 24 h after treatment, respectively, resulting in a high level of induced resistance against tobacco necrosis virus (TNV). Besides, treatment with the ABA inhibitor nordihydroguaiaretic acid (NDGA, 10 mM), before CHT application, reduced both callose deposition and plant resistance to virus, thus showing that these processes are modulated by ABA. In conclusion, these results, overall, indicate that CHT could contribute to improve a sustainable approach in crop protection, both protecting plants against viral diseases and promoting a better water use management in a global climate change scenario. (literal)
Titolo
  • L’acido abscissico quale mediatore dell’attività antitraspirante ed antivirale del chiosano. (literal)
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