Details

Autor(en) / Beteiligte

• Rasineni, Girish K
• Guha, Anirban
• Reddy, Attipalli R

Titel

Responses of Gmelina arborea, a tropical deciduous tree species, to elevated atmospheric CO2: Growth, biomass productivity and carbon sequestration efficacy

Ist Teil von

• Plant science (Limerick), 2011-10, Vol.181 (4), p.428-438

Ort / Verlag

Shannon: Elsevier Ireland Ltd

Erscheinungsjahr

2011

Quelle

MEDLINE

Beschreibungen/Notizen

• The photosynthetic response of trees to rising CO2 concentrations largely depends on source–sink relations, in addition to differences in responsiveness by species, genotype, and functional group. Previous studies on elevated CO2 responses in trees have either doubled the gas concentration (>700μmolmol−1) or used single large addition of CO2 (500–600μmolmol−1). In this study, Gmelina arborea, a fast growing tropical deciduous tree species, was selected to determine the photosynthetic efficiency, growth response and overall source–sink relations under near elevated atmospheric CO2 concentration (460μmolmol−1). Net photosynthetic rate of Gmelina was ∼30% higher in plants grown in elevated CO2 compared with ambient CO2-grown plants. The elevated CO2 concentration also had significant effect on photochemical and biochemical capacities evidenced by changes in FV/FM, ABS/CSm, ET0/CSm and RuBPcase activity. The study also revealed that elevated CO2 conditions significantly increased absolute growth rate, above ground biomass and carbon sequestration potential in Gmelina which sequestered ∼2100gtree−1 carbon after 120 days of treatment when compared to ambient CO2-grown plants. Our data indicate that young Gmelina could accumulate significant biomass and escape acclimatory down-regulation of photosynthesis due to high source-sink capacity even with an increase of 100μmolmol−1 CO2.