Premium
Ozone stimulates apoplastic antioxidant systems in pumpkin leaves
Author(s) -
Ranieri A.,
D'Urso G.,
Nali C.,
Lorenzini G.,
Soldatini G. F.
Publication year - 1996
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1034/j.1399-3054.1996.970224.x
Subject(s) - apoplast , ozone , chemistry , antioxidant , botany , horticulture , biology , biochemistry , cell wall , organic chemistry
The phytotoxiticky of ozone is due to its high oxidant capacity and to its ability to generate toxic molecular species. It is well known that intracellular peroxidases play an important role in eliminating toxic forms of oxygen but little evidence has been reported on the role of peroxidases in the apoplastic compartment. The detoxification systems located in the foliar extracellular matrix and in the intracellular fluid of sensitive pumpkin plants ( Cucurbita pepo L. cv. Ambassador) exposed to ozone (150 ppb. 5 days. 5 h day‐ 1 ) in a fumigation chamber, were analyzed. The analyses were carried out on both young and mature leaves. Ascorbate peroxidase (EC 1.11.1.11) was found in the extracellular matrix of the pumpkin tissues. Its activity increased in both young and mature leaves as a consequence of the treatment, while at intraeellular levels its effect was most prominent in mature leaves. Analysis of the ascorbie‐dehydroascorbic acid system revealed an enhancement of the pool content in the extracellular matrix of both kinds of leaves as a consequence of fumigation, while at the intracelluiar level small variations were found. Very little variation was observed in the glutathione pool as a consequence of fumigation. The analysis of a lipid peroxidation marker, malondi‐aldehyde. showed the significant effect of ozone on membrane lipids. Following fumigation, the free phenols in the extracellular matrix decreased in both young and mature leaves, while the free and glycoside‐bound phenols of the intracellular fluid showed little increase. The results support the hypothesis that ozone stimulates the an‐tioxidant systems mainly in the apoplast and that ascorbic peroxidase activity, ascorbic acid levels and cell wall stiffening are the most influenced parameters.