Congressi Nazionali SISEF

*

Poster

Fares S, Oksanen E, Nogu’as I, Loreto F

BVOC emission and ozone uptake along the profile of Populus nigra saplings exposed to high levels of atmospheric ozone

Riassunto: Leaves produce BVOCs (Biogenic Volatile Organic Compounds) in response to oxidative stresses e.g. high levels of tropospheric ozone. BVOCs can act as ozone scavenger in the intercellular spaces thus limiting ozone reactions, Reactive Oxygen Species formation, and membranes peroxidation. Two sets of saplings of Populus nigra were grown in climate chambers (one at 100 ppb of ozone and one in ozone-free air). To test whether isoprene influences ozone uptake along the plant profile which reflects ontogenetic differences at leaf level, a) BVOC emission (isoprene and oxygenated compounds), b) ozone uptake and c) physiological parameters (photosynthesis and stomatal conductance) were measured from the apex to the basal leaf). Results showed that isoprene emission decreased in the youngest, apical leaves as compared to the oldest ones. An opposite trend was observed for oxygenated BVOCs, mainly methanol. Ozone inhibited isoprene emission, but stimulated stomatal conductance and, consequently, stomatal ozone uptake, especially in younger leaves. Thus isoprene emission and ozone uptake are not related along the plant profile. Oxygenated compounds increased in the ozone treated plants indicating membrane peroxidation. No differences in photosynthesis were observed in the same conditions, which indicates that oxygenated BVOCs may be a sensitive indicator of injury.

Citazione: Fares S, Oksanen E, Nogu’as I, Loreto F (2007). BVOC emission and ozone uptake along the profile of Populus nigra saplings exposed to high levels of atmospheric ozone. In: VI Congresso Nazionale SISEF “La gestione delle foreste tra cambiamenti globali e azioni locali“ (CRA-ISSAR, Arezzo 25-27 Settembre 2007), Abstract-book, Contributo #c06.6.10. - [online] URL: https://congressi.sisef.org/?action=paper&id=1661

Dettagli

Congresso VI Congresso Nazionale SISEF
“La gestione delle foreste tra cambiamenti globali e azioni locali”
CRA-ISSAR, Arezzo 25-27 Settembre 2007
Collocazione c06.6.10 (#)
Sessione Sessione Poster 02
Moderatore/i -
Data Sep 27, 2007
Ora 12:53-12:53
Luogo -
Info Autori
(*): speaker

S Fares
CNR - Istituto di Biologia Agroambientale e Forestale, Via Salaria km. 29.300 00016 Monterotondo Scalo (Roma), ITALY
Italy

E Oksanen
University of Joensuu, P.O.Box 111, FIN-80101, Department of Biology, Finland
Italy

I Nogu’as
CNR - Istituto di Biologia Agroambientale e Forestale, Via Salaria km. 29.300 00016 Monterotondo Scalo (Roma), ITALY
Italy

F Loreto
CNR - Istituto di Biologia Agroambientale e Forestale, Via Salaria km. 29.300 00016 Monterotondo Scalo (Roma), ITALY
Italy