The Effects of Elevated CO2 Concentration on Photosynthesis and Photosystem Ⅱ Photochemistry in a Fast Growing Tree Species, Gmelina Arborea Roxb
Sequestering atmospheric carbon and storing it in the terrestrial biosphere is one of the options to mitigate green house gas emissions. Young fast growing tree species are believed to be major potential sinks which could absorb large quantities of CO2 from the atmosphere. The ability of plant to capture light energy, associated with the rate of CO2 fixation per se, is crucial to understand the growth dynamics under varying environmental regimes. The role of enriched CO2 atmosphere in the kinetics of photosynthesis and Chl a fluorescence could be an index to understand the Photosystem Ⅱ photochemistry associated with carbon sequestration potential. In this study, the effects of elevated CO2 (460 umol mol-1) on diurnal courses of net CO2 assimilation and chlorophyll a fluorescence were investigated under natural high light during summer days in a fast growing tree species, Gmelina arborea (Verbenaceae). High CO2 atmosphere led to easy recovery from the midday photosynthetic depression in the leaves. Elevated C O2 also enhanced the utilization of captured light energy, alleviated photoinhibition and enhanced the growth of Gmelina arborea. Data on fluorescence induction curves and JIP-test parameters also demonstrated a positive impact of elevated CO2 on PSⅡ photochemical performance suggesting Gmelina to be a better performer for carbon sequestration even during high irradiance regimes.
Chlorophyll a fluorescence Elevated CO2 Gmelina arborea Photosynthesis PS Ⅱ efficiency
Girish K Rasineni Attipalli R Reddy
Photosynthesis and Plant Stress Biology Laboratory, University of Hyderabad Hyderabad 500 046, India
国际会议
15th International Conference on Photosynthesis(第15届国际光合作用大会)
北京
英文
777-780
2010-08-22（万方平台首次上网日期，不代表论文的发表时间）