Abstract
Key message
Growth temperature had little effect on the response of net photosynthesis to high temperatures (up to 47 °C). On the other hand, elevated [CO 2 ] increased net photosynthesis at high temperatures.
Abstract
We investigated whether Pinus taeda seedlings grown under elevated CO2-concentration ([CO2]) and temperature would be able to maintain positive net photosynthesis (A net) longer than seedlings grown under ambient conditions when exposed to temperatures up to 47 °C. Additionally, we investigated whether a locally applied temperature increase would yield the same short-term gas exchange response to temperatures up to 47 °C as a naturally occurring latitudinal temperature increase of equal magnitude. Growth conditions were applied for 7 months (February to August) in treatment chambers constructed at two sites in the native range of P. taeda in the southern US. The sites were located 300 km apart along a north–south axis with a natural temperature difference of 2.1 °C. Seedlings were grown under ambient temperature and [CO2] conditions at both sites. At the northern site, we also applied a temperature increase of 2 °C (T E), ensuring that this treatment equalled the mean temperature at the southern site. Additionally, at the northern site, we applied a treatment of elevated [CO2] (C E). Gas exchange was measured on all plants in walk-in environmentally controlled chambers. Under C E, there was no difference in A net of seedlings grown in ambient or ambient +2 °C temperatures at any measurement temperature, while differences were present under ambient [CO2]. Furthermore, A net was higher under C E than under ambient [CO2]. At 47 °C, A net was negative in all seedlings except those in the C E and ambient temperature treatment combination. Seedlings at the northern site in the T E treatment showed no significant differences in A net compared with seedlings grown at ambient temperature at the southern site, indicating that the plants responded equally to a manipulated temperature increase and a latitudinal increase in temperature. Our results suggest that elevated [CO2] increases photosynthetic thermotolerance at high temperature (>41 °C), but this effect diminishes as temperature increases further. Temperature manipulations could provide accurate information on the effect of latitudinal differences in temperature on leaf gas exchange of P. taeda.
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Author contribution statement
IB performed the analyses, created the figures and designed the manuscript. TBHLM and TMW conducted the measurements and assisted in the analyses. TMW, MAM, and ROT designed the study. MAM, ROT, and KS supervised the work. All authors discussed the results and made substantial contributions to the manuscript.
Acknowledgments
This project was supported by a grant to ROT from the United States Department of Energy NICCR Program (Grant: 07-SC-NICCR-1060). In addition, a travel grant from the CWO, Ghent University, allowing the participation of TBHLM and Lorenz Meire on the project is gratefully acknowledged. The authors appreciate LM’s help with the measuring campaign.
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The authors declare that they have no conflict of interest.
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Communicated by M. Buckeridge.
I. Bauweraerts and T. B. H. L. Mannaerts contributed equally to this paper.
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468_2014_1057_MOESM1_ESM.tif
Fig. S1 Native distribution range of Pinus taeda L. (Little, 1971), with the locations of the two study sites. The distance between the northern (Athens) and southern (Tifton) sites is 300 km, with a difference in mean air temperature between the two sites of 2.1 °C during the growth period (15 February through 21 August). (TIFF 4273 kb)
468_2014_1057_MOESM2_ESM.tif
Fig. S2 Treatment design for the chambers at the northern site. Clear box indicates ambient temperature; grey box indicates elevated temperature; “X” indicates elevated [CO2]; no “X” indicates ambient [CO2]. Expanded view shows placement of seedling blocks within chamber. The single chamber at the southern site was maintained at ambient temperature and CO2 conditions. (TIFF 3921 kb)
468_2014_1057_MOESM3_ESM.tif
Fig. S3 Mean, maximum, and minimum daily temperature (°C) measured outdoors at 1 m above ground level during the growth period (15 February through 21 August) at the northern (Athens) and southern (Tifton) sites in Georgia, USA. (TIFF 10988 kb)
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Bauweraerts, I., Mannaerts, T.B.H.L., Wertin, T.M. et al. Elevated [CO2] and growth temperature have a small positive effect on photosynthetic thermotolerance of Pinus taeda seedlings. Trees 28, 1515–1526 (2014). https://doi.org/10.1007/s00468-014-1057-3
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DOI: https://doi.org/10.1007/s00468-014-1057-3