Abstract
This study evaluates acclimation of photosynthesis and stomatal conductance in three evolutionary lineages of C3, C3–C4 intermediate, and C4 species grown in the low CO2 and hot conditions proposed to favo r the evolution of C4 photosynthesis. Closely related C3, C3–C4, and C4 species in the genera Flaveria, Heliotropium, and Alternanthera were grown near 380 and 180 μmol CO2 mol−1 air and day/night temperatures of 37/29°C. Growth CO2 had no effect on photosynthetic capacity or nitrogen allocation to Rubisco and electron transport in any of the species. There was also no effect of growth CO2 on photosynthetic and stomatal responses to intercellular CO2 concentration. These results demonstrate little ability to acclimate to low CO2 growth conditions in closely related C3 and C3–C4 species, indicating that, during past episodes of low CO2, individual C3 plants had little ability to adjust their photosynthetic physiology to compensate for carbon starvation. This deficiency could have favored selection for more efficient modes of carbon assimilation, such as C3–C4 intermediacy. The C3–C4 species had approximately 50% greater rates of net CO2 assimilation than the C3 species when measured at the growth conditions of 180 μmol mol−1 and 37°C, demonstrating the superiority of the C3–C4 pathway in low atmospheric CO2 and hot climates of recent geological time.
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Acknowledgments
This research was supported by Discovery grants from the Natural Science and Engineering Research Council of Canada to R.F. Sage. We thank Professor P. Westhoff and Dr. U. Gowik for providing Alternanthera sessilis and A. tenella seeds, and Professor G. Edwards for the gift of Flaveria bidentis seeds.
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Communicated by Russell Monson.
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Vogan, P.J., Sage, R.F. Effects of low atmospheric CO2 and elevated temperature during growth on the gas exchange responses of C3, C3–C4 intermediate, and C4 species from three evolutionary lineages of C4 photosynthesis. Oecologia 169, 341–352 (2012). https://doi.org/10.1007/s00442-011-2201-z
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DOI: https://doi.org/10.1007/s00442-011-2201-z