Histochemical and ecophysiological response in ash exposed to ozone. (Abstract in rivista)

Type
Label
  • Histochemical and ecophysiological response in ash exposed to ozone. (Abstract in rivista) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Alternative label
  • Santarelli S., Petruzziello S., Nali C., Paoletti E., Lorenzini G. (2004)
    Histochemical and ecophysiological response in ash exposed to ozone.
    in XI Congresso Nazionale SIPaV, Milano, 2004
    (literal)
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  • Santarelli S., Petruzziello S., Nali C., Paoletti E., Lorenzini G. (literal)
Convegno
  • XI Congresso Nazionale SIPaV (literal)
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  • Milano (literal)
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  • Visible leaf symptoms attributed to ozone injury have been detected in a growing list of plant species. Symptoms are caused by the induction of oxidative stress in the mesophyll, resulting in discrete and light-dependent hypersensitive-like responses and in accelerated cell senescence, being independent of the taxonomic position of the species. Thus, it is important to investigate the possibility of validation of the foliar “ozone-like” visible symptoms using ecophysiological and micromorphological methods. In this work, the response of ash (Fraxinus excelsior) to a chronic exposure of ozone (150 ppb for 8 h d-1 per 35 d) was investigated under controlled conditions versus control plants maintained in filtered air. Twenty days after fumigation, treated plants developed chlorosis and adaxial necrosis on mature fully expanded leaves. At the same time, a decrease of the chlorophyll content was observed (-30% in comparison with controls). Also the photosynthetic efficiency diminished significantly after 7 and 20 days of exposure (-59 and -61%, compared to the control, respectively). Simultaneously, CO2 concentration in the substomatal chamber increased (11%), indicating a mesophyllic limitation of the photosynthetic process. Histochemical markers such as autofluorescence, the presence of cell-wall thickenings, the enlarged cell vacuole of non-necrotic cells, and the typical necrotic lesions of palisade tissue allow differential diagnosis of visible ozone injury. (literal)
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  • -Santarelli S., Petruzziello S., Nali C., Lorenzini G., Dipartimento di Coltivazione e Difesa delle Specie Legnose Giovanni Scaramuzzi, Università degli Studi di Pisa, Via del Borghetto 80, I-56124 Pisa, Italy -Paoletti E., Istituto per la Protezione delle Piante, CNR, Sez. di Firenze, Via Madonna del Piano 10, I-50019 Firenze, Italy (literal)
Titolo
  • Histochemical and ecophysiological response in ash exposed to ozone. (literal)
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