Details

Autor(en) / Beteiligte

• Calfapietra, Carlo
• Scarascia Mugnozza, Giuseppe
• Karnosky, David F.
• Loreto, Francesco
• Sharkey, Thomas D.

Titel

Isoprene emission rates under elevated CO2 and O3 in two field‐grown aspen clones differing in their sensitivity to O3

Ist Teil von

• The New phytologist, 2008-07, Vol.179 (1), p.55-61

Ort / Verlag

Oxford, UK: Blackwell Publishing Ltd

Erscheinungsjahr

2008

Link zum Volltext

Quelle

Wiley Blackwell Single Titles

Beschreibungen/Notizen

• Summary •  Isoprene is the most important nonmethane hydrocarbon emitted by plants. The role of isoprene in the plant is not entirely understood but there is evidence that it might have a protective role against different oxidative stresses originating from heat shock and/or exposure to ozone (O3). Thus, plants under stress conditions might benefit by constitutively high or by higher stress‐induced isoprene emission rates. •  In this study, measurements are presented of isoprene emission from aspen (Populus tremuloides) trees grown in the field for several years under elevated CO2 and O3. Two aspen clones were investigated: the O3‐tolerant 271 and the O3‐sensitive 42E. •  Isoprene emission decreased significantly both under elevated CO2 and under elevated O3 in the O3‐sensitive clone, but only slightly in the O3‐tolerant clone. •  This study demonstrates that long‐term‐adapted plants are not able to respond to O3 stress by increasing their isoprene emission rates. However, O3‐tolerant clones have the capacity to maintain higher amounts of isoprene emission. It is suggested that tolerance to O3 is explained by a combination of different factors; while the reduction of O3 uptake is likely to be the most important, the capacity to maintain higher amounts of isoprene is an important factor in strengthening this character.