Photosynthesis of coppicing poplar clones in a free-air CO2 enrichment (FACE) experiment in a short-rotation forest

Functional Plant Biology : FPB
Mark J Hovenden

Abstract

Photosynthetic capacity was assessed in coppices of three poplar clones (Populus alba L. genotype 2AS11, P. × euramericana (Dode) Guinier genotype I-214 and P. nigra L. genotype Jean Pourtet) growing in the POPFACE/EUROFACE free-air CO2 enrichment experiment in central Italy. Plants were grown either at an elevated CO2 concentration of 550 μmol mol-1 or in control conditions for 3 years and were then harvested and allowed to coppice. Plants were either fertilised with the addition of liquid fertiliser at a level of 212 kg N ha-1 year-1 or unfertilised after harvesting. No evidence was found of changes in the maximum Rubisco carboxylation rate (VCmax) and thus there was no photosynthetic downregulation caused by the FACE treatment in either P. × euramericana or P. nigra, but there was a marginally significant reduction in VCmax of fertilised P. alba (P<0.09). Carbon assimilation rates were significantly higher in FACE plants than control plants. Maximum carbon assimilation rate was stimulated by an average of 32.8% in these clones, with individual stimulation values of 27.6% for P. alba, 32.1% for P. × euramericana and 49.5% for P. nigra. No significant interactions between the FACE and fertilisation treatments were found for an...Continue Reading

Citations

Sep 21, 2004·Annual Review of Plant Biology·Stephen P LongDonald R Ort

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