期刊
PHOTOSYNTHESIS RESEARCH
卷 119, 期 1-2, 页码 89-100出版社
SPRINGER
DOI: 10.1007/s11120-013-9873-7
关键词
Temperature acclimation; Carbon balance; Global change biology; Meta-analysis; Day respiration
资金
- NSERC
- US Department of Agriculture, Agriculture and Food Research Initiative [2011-67003-30222]
- US Department of Energy, Terrestrial Ecosystem Sciences [11-DE-SC-0006967]
- US-Israeli Binational Science Foundation [2010320]
- Japan Society for the Promotion of Science
- Grants-in-Aid for Scientific Research [25891005] Funding Source: KAKEN
While interest in photosynthetic thermal acclimation has been stimulated by climate warming, comparing results across studies requires consistent terminology. We identify five types of photosynthetic adjustments in warming experiments: photosynthesis as measured at the high growth temperature, the growth temperature, and the thermal optimum; the photosynthetic thermal optimum; and leaf-level photosynthetic capacity. Adjustments of any one of these variables need not mean a concurrent adjustment in others, which may resolve apparently contradictory results in papers using different indicators of photosynthetic acclimation. We argue that photosynthetic thermal acclimation (i.e., that benefits a plant in its new growth environment) should include adjustments of both the photosynthetic thermal optimum (T (opt)) and photosynthetic rates at the growth temperature (A (growth)), a combination termed constructive adjustment. However, many species show reduced photosynthesis when grown at elevated temperatures, despite adjustment of some photosynthetic variables, a phenomenon we term detractive adjustment. An analysis of 70 studies on 103 species shows that adjustment of T (opt) and A (growth) are more common than adjustment of other photosynthetic variables, but only half of the data demonstrate constructive adjustment. No systematic differences in these patterns were found between different plant functional groups. We also discuss the importance of thermal acclimation of respiration for net photosynthesis measurements, as respiratory temperature acclimation can generate apparent acclimation of photosynthetic processes, even if photosynthesis is unaltered. We show that while dark respiration is often used to estimate light respiration, the ratio of light to dark respiration shifts in a non-predictable manner with a change in leaf temperature.
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