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Salicylic Acid Modulates Ozone-induced Hypersensitive Cell Death in Tobacco Plants by Stefania Pasqualini; Guido Della Torre; Francesco Ferranti; Luisa Ederli; Claudia Piccioni; Lara Reale; Marisa Antonielli is a Agricultural and Biological Sciences article available to read on EtoBox.

What is Salicylic Acid Modulates Ozone-induced Hypersensitive Cell Death in Tobacco Plants about?

Ozone‐tolerant Bel B and ozone‐sensitive Bel W3 tobacco cultivars were subjected to acute ozone fumigation (200 p.p.b. for 3 h) and the subcellular localization of H~2~O~2~ was then studied. H~2~O~2~ accumulated on the cell walls and plasma membrane of both cultivars but the accumulation pattern differed greatly. H~2~O~2~ production was high in both cultivars immediately after fumigation, but, in the tolerant Bel B cultivar, after 7 h was only detected in some spongy cells adjacent to epidermal cells. Instead, in the sensitive Bel W3 cultivar, accumulation was still abundant in the cell walls of palisade, spongy and epidermal cells at this time. Significant changes in apoplastic ascorbate pool were noted in both cultivars in the first hours after fumigation. As the reduced ascorbate content remained unchanged, the marked increase in total ascorbate must have originated from the striking increase in dehydroascorbate, particularly in the ozone‐sensitive Bel W3. Exposure of plants to ozone resulted in a marked transient increase in both free and conjugated salicylic acid (SA) as well as an increase in the activity of benzoic acid 2‐hydroxylase which catalyses SA biosynthesis. SA induc

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Author

Stefania Pasqualini; Guido Della Torre; Francesco Ferranti; Luisa Ederli; Claudia Piccioni; Lara Reale; Marisa Antonielli

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0031-9317)

Published

2002

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)