Details

Autor(en) / Beteiligte

• Tognetti, R
• Raschi, A

Titel

effect of elevated atmospheric CO2 concentration on two Populus clones grown in a FACE system

Ist Teil von

• Journal of crop improvement, 2005-01, Vol.13 (1-2), p.377-392

Ort / Verlag

Taylor & Francis Group

Erscheinungsjahr

2005

Quelle

Taylor & Francis

Beschreibungen/Notizen

• Two poplar clones, hybrid Populus deltoides Bartr. Ex Marsh X Populus nigra L. (Populus xeuramericana), clone I-214, and Populus deltoides, clone Lux, were grown from hardwood cuttings for one growing season in either ambient (360 μmol mol −1 ) or elevated (560 μmol mol −1 ) [CO 2 ] in FACE-systemrings at Rapolano Terme (Siena, Italy). Both clones I-214 and Lux exhibited a higher aboveground bio-mass, photosynthesis at light saturation and instantaneous transpiration efficiency (ITE) in CO 2 -enriched air. The elevated [CO 2 ]-induced responses of clone I-214 included increased investment in branch and leaf biomass, and enhanced stem volume. The elevated [CO 2 ]-induced responses of clone Lux included an increase in the number of branches (and foliage area). Indication of photosynthetic acclimation under elevated [CO 2 ] was found during the early morning, but only in clone I-214. Stomatal conductance decreased under elevated [CO 2 ] particularly in clone Lux. Clone differences in response to elevated [CO 2 ] should be taken in account when planning future poplar plantations in forecast warmer and drier Mediterranean sites.