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Germination of CO2-enriched Pinus taeda L. seeds and subsequent seedling growth responses to CO2 enrichment
Article first published online: 20 DEC 2001
Volume 15, Issue 3, pages 344–350, June 2001
How to Cite
Hussain, M., Kubiske, M. E. and Connor, K. F. (2001), Germination of CO2-enriched Pinus taeda L. seeds and subsequent seedling growth responses to CO2 enrichment. Functional Ecology, 15: 344–350. doi: 10.1046/j.1365-2435.2001.00521.x
- Issue published online: 20 DEC 2001
- Article first published online: 20 DEC 2001
- Elevated CO2;
- Pinus taeda;
- seed germination;
- seed lipids;
- seed production
- 1Pinus taeda seeds, developed under ambient or elevated (ambient + 200 µl l−1) [CO2], were collected from Duke Forest, North Carolina, USA in October 1998. Seeds were germinated in nutrient-deficient soil in either ambient or elevated [CO2] (ambient + 200 µl l−1) greenhouse chambers and allowed to grow for 120 days.
- 2Seeds that developed in elevated [CO2] had 91 and 265% greater weight and lipid content, respectively, and three times the germination success, compared to those developed in current ambient [CO2].
- 3Seedlings from the elevated [CO2] seed source had significantly greater root length and more needles regardless of greenhouse chamber, but there were no treatment effects on tissue or total biomass.
- 4Severely limiting nutrient conditions resulted in significant photosynthetic downregulation by seedlings grown in greenhouse chambers with elevated [CO2], regardless of seed source.
- 5Our hypothesis that greater seed reserves from CO2 enrichment would synergistically affect seedling growth responses to elevated [CO2] was not strongly supported. Nonetheless, seeds produced in a CO2-enriched environment may have fundamental changes in their viability, chemistry and germination that may affect reproduction.