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|Title:||Evergreen leaf respiration acclimates to long-term nocturnal warming under field conditions|
|Citation:||Global Change Biology, 2007; 13(6):1216-1223|
|Publisher:||Blackwell Science Ltd|
|Dan Bruhn, John J. G. Egerton, Beth R. Loveys and Marilyn C. Ball|
|Abstract:||Acclimation of plant respiration rates (R) to climate warming is highly variable and many results appear contradictory. We tested the recently suggested hypotheses that pre-existing, long-lived leaves should exhibit a relatively limited ability for R to acclimate to climate warming, and that acclimation would occur via changes in the short-term temperature sensitivity of respiration. Seedlings of a subalpine, evergreen tree species (Eucalyptus pauciflora) were grown under naturally fluctuating conditions within its natural distribution. We used a free air temperature increase (FATI) system of infra-red ceramic lamps to raise night-time leaf temperatures by 0.3±0.1, 1.3±0.1, and 2.2±0.1 °C above ambient for 1 year. Light-saturated assimilation rates and plant growth did not change with nocturnal FATI treatments. Leaf R measured at prevailing temperatures did not differ between FATI treatments. Within each FATI treatment, nocturnal leaf R was highly sensitive to artificial temperature changes within minutes, and also correlated strongly with natural nocturnal and seasonal temperature variation. The corresponding values of Q₁₀ of R varied according to time scale of measurements, but did not vary between FATI treatments. Instead, acclimation of R to nocturnal FATI occurred through changes in the base rate of respiration.|
|Keywords:||acclimation; climate warming; field; free air temperature increase (FATI); leaf; respiration; Q10; temperature sensitivity|
|Rights:||© 2007 The Authors|
|Appears in Collections:||Agriculture, Food and Wine publications|
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