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Growth temperature can alter the temperature dependent stimulation of photosynthesis by elevated carbon dioxide in Albutilon theophrasti
Author(s) -
Ziska L. H.
Publication year - 2001
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1034/j.1399-3054.2001.1110309.x
Subject(s) - photosynthesis , carbon dioxide , carboxylation , photon flux , electron transport chain , chemistry , atmospheric temperature range , analytical chemistry (journal) , botany , thermodynamics , biology , environmental chemistry , biochemistry , physics , photon , organic chemistry , quantum mechanics , catalysis
Stimulation of photosynthesis in response to elevated carbon dioxide concentration [CO 2 ] in the short‐term (min) should be highly temperature dependent at high photon flux. However, it is unclear if long‐term (days, weeks) adaptation to a given growth temperature alters the temperature‐dependent stimulation of photosynthesis to [CO 2 ]. In velveltleaf ( Albutilon theophrasti ), the response of photosynthesis, determined as CO 2 assimilation, was measured over a range of internal CO 2 concentrations at 7 short‐term measurement (12, 16, 20, 24, 28, 32, 36°C) temperatures for each of 4 long‐term growth (16, 20, 28 and 32°C) temperatures. In vivo estimates of V Cmax , the maximum RuBP saturated rate of carboxylation, and J max , the light‐saturated rate of potential electron transport, were determined from gas exchange measurements for each temperature combination. Overall, previous exposure to a given growth temperature adjusted the optimal temperatures of J max and V Cmax with subsequently greater enhancement of photosynthesis at elevated [CO 2 ] (i.e., a greater enhancement of photosynthesis at elevated [CO 2 ] was observed at low measurement temperatures for A. theophrasti grown at low growth temperatures compared with higher growth temperatures, and vice versa for plants grown and measured at high temperatures). Previous biochemical based models used to predict the interaction between rising [CO 2 ] and temperature on photosynthesis have generally assumed no growth temperature effect on carboxylation kinetics or no limitation by J max . In the current study, these models over predicted the temperature dependence of the photosynthetic response to elevated [CO 2 ] at temperatures above 24°C. If these models are modified to include long‐term adjustments of J max and V Cmax to growth temperature, then greater agreement between observed and predicted values was obtained.