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Responses of respiration in the light to warming in field-grown trees: a comparison of the thermal sensitivity of the Kok and Laisk methods.
- Source :
-
The New phytologist [New Phytol] 2019 Apr; Vol. 222 (1), pp. 132-143. Date of Electronic Publication: 2018 Nov 30. - Publication Year :
- 2019
-
Abstract
- The Kok and Laisk techniques can both be used to estimate light respiration R <subscript>light</subscript> . We investigated whether responses of R <subscript>light</subscript> to short- and long-term changes in leaf temperature depend on the technique used to estimate R <subscript>light</subscript> . We grew Eucalyptus tereticornis in whole-tree chambers under ambient temperature (AT) or AT + 3°C (elevated temperature, ET). We assessed dark respiration R <subscript>dark</subscript> and light respiration with the Kok (R <subscript>Kok</subscript> ) and Laisk (R <subscript>Laisk</subscript> ) methods at four temperatures to determine the degree of light suppression of respiration using both methods in AT and ET trees. The ET treatment had little impact on R <subscript>dark</subscript> , R <subscript>Kok</subscript> or R <subscript>Laisk</subscript> . Although the thermal sensitivities of R <subscript>Kok</subscript> or R <subscript>Laisk</subscript> were similar, R <subscript>Kok</subscript> was higher than R <subscript>Laisk</subscript> . We found negative values of R <subscript>Laisk</subscript> at the lowest measurement temperatures, indicating positive net CO <subscript>2</subscript> uptake, which we propose may be related to phosphoenolpyruvate carboxylase activity. Light suppression of R <subscript>dark</subscript> decreased with increasing leaf temperature, but the degree of suppression depended on the method used. The Kok and Laisk methods do not generate the same estimates of R <subscript>light</subscript> or light suppression of R <subscript>dark</subscript> between 20 and 35°C. Negative rates of R <subscript>Laisk</subscript> imply that this method may become less reliable at low temperatures.<br /> (© 2018 The Authors. New Phytologist © 2018 New Phytologist Trust.)
- Subjects :
- Carbon Dioxide metabolism
Cell Respiration radiation effects
Darkness
Mesophyll Cells physiology
Mesophyll Cells radiation effects
Mitochondria metabolism
Mitochondria radiation effects
Plant Stomata physiology
Plant Stomata radiation effects
Light
Temperature
Trees growth & development
Trees radiation effects
Subjects
Details
- Language :
- English
- ISSN :
- 1469-8137
- Volume :
- 222
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- The New phytologist
- Publication Type :
- Academic Journal
- Accession number :
- 30372524
- Full Text :
- https://doi.org/10.1111/nph.15566