Three physiological parameters capture variation in leaf respiration of Eucalyptus grandis , as elicited by short-term changes in ambient temperature, and differing nitrogen supply
| Autor: | Mark A. Adams, Jörg Kruse, Heinz Rennenberg |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Physiology Chemistry Starch chemistry.chemical_element Plant Science Atmospheric temperature range Carbohydrate Photosynthesis 01 natural sciences Nitrogen Acclimatization 03 medical and health sciences chemistry.chemical_compound 030104 developmental biology Animal science Respiration Respiratory system 010606 plant biology & botany |
| Zdroj: | Plant, Cell & Environment. 41:1369-1382 |
| ISSN: | 0140-7791 |
| Popis: | We used instantaneous temperature responses of CO2 -respiration to explore temperature acclimation dynamics for Eucalyptus grandis grown with differing nitrogen supply. A reduction in ambient temperature from 23 to 19 °C reduced light-saturated photosynthesis by 25% but increased respiratory capacity by 30%. Changes in respiratory capacity were not reversed after temperatures were subsequently increased to 27 °C. Temperature sensitivity of respiration measured at prevalent ambient temperature varied little between temperature treatments but was significantly reduced from ~105 kJ mol-1 when supply of N was weak, to ~70 kJ mol-1 when it was strong. Temperature sensitivity of respiration measured across a broader temperature range (20-40 °C) could be fully described by 2 exponent parameters of an Arrhenius-type model (i.e., activation energy of respiration at low reference temperature and a parameter describing the temperature dependence of activation energy). These 2 parameters were strongly correlated, statistically explaining 74% of observed variation. Residual variation was linked to treatment-induced changes in respiration at low reference temperature or respiratory capacity. Leaf contents of starch and soluble sugars suggest that respiratory capacity varies with source-sink imbalances in carbohydrate utilization, which in combination with shifts in carbon-flux mode, serve to maintain homeostasis of respiratory temperature sensitivity at prevalent growth temperature. |
| Databáze: | OpenAIRE |
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