In sunflower plants exposed to 150 nl L-1 of O3 (4 h day-1 for 4 days) an enhancement in the activity of APx was found at both the apoplastic and symplastic levels, while stromal and thylakoid-bound chloroplastic APx activity did not change. PAGE analysis confirmed the presence of APx activity in the apoplast and revealed different APx isoenzyme patterns between control and O3-treated plants in either apoplastic and cytoplasmic samples. Immunoreaction with a cytosolic APx antibody revealed, at both the apoplastic and symplastic levels, only one band, more evident in the O3-treated than in the control plants. These results support the hypothesis of a cytoplasmic origin for the apoplastic isoform. Thus, sunflower plants seem to adapt to O3-induced oxidative stress through the induction of genes coding for APx proteins whose enzymatic activity enhancement at the apoplastic and cytosolic levels may act as a biochemical defence line against ozone pollution damage.

Differential stimulation of ascorbate peroxidase isoforms by ozone exposure in sunflower plants

RANIERI, ANNAMARIA;CASTAGNA, ANTONELLA;SOLDATINI, GIANFRANCO
2000

Abstract

In sunflower plants exposed to 150 nl L-1 of O3 (4 h day-1 for 4 days) an enhancement in the activity of APx was found at both the apoplastic and symplastic levels, while stromal and thylakoid-bound chloroplastic APx activity did not change. PAGE analysis confirmed the presence of APx activity in the apoplast and revealed different APx isoenzyme patterns between control and O3-treated plants in either apoplastic and cytoplasmic samples. Immunoreaction with a cytosolic APx antibody revealed, at both the apoplastic and symplastic levels, only one band, more evident in the O3-treated than in the control plants. These results support the hypothesis of a cytoplasmic origin for the apoplastic isoform. Thus, sunflower plants seem to adapt to O3-induced oxidative stress through the induction of genes coding for APx proteins whose enzymatic activity enhancement at the apoplastic and cytosolic levels may act as a biochemical defence line against ozone pollution damage.
Ranieri, Annamaria; Castagna, Antonella; Soldatini, Gianfranco
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/227539
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 26
  • ???jsp.display-item.citation.isi??? 22
social impact