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. 2003 Sep;159(3):609-621.
doi: 10.1046/j.1469-8137.2003.00850.x.

Photosynthesis and stomatal conductance responses of poplars to free-air CO2 enrichment (PopFACE) during the first growth cycle and immediately following coppice

C J Bernacchi  1   2 , C Calfapietra  3 , P A Davey  4 , V E Wittig  2 , G E Scarascia-Mugnozza  3 , C A Raines  4 , S P Long  2
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Free article

Photosynthesis and stomatal conductance responses of poplars to free-air CO2 enrichment (PopFACE) during the first growth cycle and immediately following coppice

C J Bernacchi et al. New Phytol. 2003 Sep.
Free article

Abstract

• Using the Poplar Free Air CO2 Enrichement (PopFACE) facility we investigated the effects of elevated [CO2 ] on the diurnal and growth cycle responses of photosynthesis and conductance in three poplar species. • In situ diurnal measurements of photosynthesis were made on Populus alba, P. nigra and P. ×euramericana and, in parallel, in vivo maximum capacity for carboxylation (Vc,max ) and maximum rates of electron transport (Jmax ) were determined by gas exchange measurement. • Light saturated (Asat ) and daily integrated (A') photosynthesis increased at elevated [CO2 ] in all species. Elevated [CO2 ] decreased Vc,max and Jmax for P. nigra and Jmax for P.¥euramericana but had no effect on stomatal conductance in any of the species throughout the first growth cycle. During post-coppice re-growth, elevated [CO2 ] did not increase Asat in P. nigra and P.×euramericana due to large decreases in Vc,max and Jmax . • A 50% increase in [CO2 ] under these open-air field conditions resulted in a large and sustained increase in Asat . Although there were some differences between the species, these had little effect on photosynthetic rates at the growth [CO2 ]. Nevertheless the results show that even fast growing trees grown without rooting volume restriction in the open may still show some down-regulation of photosynthetic potential at elevated [CO2 ].

Keywords: Free Air CO2 Enrichment (FACE); Populus spp; Rubisco; atmospheric change; climate change; elevated CO2; photosynthetic electron transport.

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