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Title: | Maintenance of C sinks sustains enhanced C assimilation during long-term exposure to elevated [CO 2 ] in Mojave Desert shrubs |
Author: | Aranjuelo, Iker Ebbets, Allison L. Evans, R. Dave Tissue, David T. Nogués Mestres, Salvador Van Gestel, Natasja Payton, Paxton Ebbert, Volker Adamas III, Williams W. Nowak, Robert S. Smith, Stanley D. |
Keywords: | Plantes del desert Arbustos Fotosíntesi Diòxid de carboni Desert plants Shrubs Photosynthesis Carbon dioxide |
Issue Date: | Oct-2011 |
Publisher: | Springer Verlag |
Abstract: | During the first few years of elevated atmospheric [CO(2)] treatment at the Nevada Desert FACE Facility, photosynthetic downregulation was observed in desert shrubs grown under elevated [CO(2)], especially under relatively wet environmental conditions. Nonetheless, those plants maintained increased A (sat) (photosynthetic performance at saturating light and treatment [CO(2)]) under wet conditions, but to a much lesser extent under dry conditions. To determine if plants continued to downregulate during long-term exposure to elevated [CO(2)], responses of photosynthesis to elevated [CO(2)] were examined in two dominant Mojave Desert shrubs, the evergreen Larrea tridentata and the drought-deciduous Ambrosia dumosa, during the eighth full growing season of elevated [CO(2)] treatment at the NDFF. A comprehensive suite of physiological processes were collected. Furthermore, we used C labeling of air to assess carbon allocation and partitioning as measures of C sink activity. Results show that elevated [CO(2)] enhanced photosynthetic performance and plant water status in Larrea, especially during periods of environmental stress, but not in Ambrosia. δ(13)C analyses indicate that Larrea under elevated [CO(2)] allocated a greater proportion of newly assimilated C to C sinks than Ambrosia. Maintenance by Larrea of C sinks during the dry season partially explained the reduced [CO(2)] effect on leaf carbohydrate content during summer, which in turn lessened carbohydrate build-up and feedback inhibition of photosynthesis. δ(13)C results also showed that in a year when plant growth reached the highest rates in 5 years, 4% (Larrea) and 7% (Ambrosia) of C in newly emerging organs were remobilized from C that was assimilated and stored for at least 2 years prior to the current study. Thus, after 8 years of continuous exposure to elevated [CO(2)], both desert perennials maintained their photosynthetic capacities under elevated [CO(2)]. We conclude that C storage, remobilization, and partitioning influence the responsiveness of these desert shrubs during long-term exposure to elevated [CO(2)]. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1007/s00442-011-1996-y |
It is part of: | Oecologia, 2011, vol. 167, num. 2, p. 339-354 |
URI: | http://hdl.handle.net/2445/197768 |
Related resource: | https://doi.org/10.1007/s00442-011-1996-y |
ISSN: | 0029-8549 |
Appears in Collections: | Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals) |
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