Abstract
The capability of Phalaenopsis to acclimate its photosynthetic capacity and metabolic activity to cool night temperature conditions is crucial for improving orchid production in terms of efficient greenhouse heating. The extent to which Phalaenopsis possesses acclimation potential and the mechanistic background of the metabolic processes involved, have, however, not been studied before. Plants were subjected to a direct and gradual shift from a day to night temperature regime of 28/28–28/16°C, the cold stress and cold acclimation treatment, respectively. In comparison with the cold stress treatment, the cold acclimation treatment led to a higher malate accumulation and a reduction in leaf net CO2 uptake. Consistently, the contribution of respiratory CO2 recycling to nocturnal malate synthesis was calculated to be 23.5 and 47.0% for the cold stress and cold acclimation treatment, respectively. Moreover, the lower levels of starch measured in the cold acclimated leaves confirmed the suggested enhanced respiratory CO2 recycling, implying that Phalaenopsis CAM operation evolved towards CAM idling. It is, however, plausible that this adjustment was not an effect of the low night temperature per se but a consequence of cool-root induced drought stress. Apart from that, at the start of the photoperiod, membrane stability showed a depression which was directly counteracted by an increased generation of glucose, fructose and sucrose. From these observations, it can be concluded that the observed plasticity in CAM operation and metabolic flexibility may be recognized as important steps in the low night temperature acclimation of Phalaenopsis.
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Abbreviations
- ARS:
-
Antioxidative response system
- CA:
-
Cold acclimation
- CAM:
-
Crassulacean acid metabolism
- CS:
-
Cold stress
- EC:
-
Electrical conductivity
- F0′:
-
Minimal fluorescence from the light-adapted state
- F m :
-
Maximal fluorescence at the dark-adapted state
- Fv/Fm:
-
Maximum quantum efficiency of PSII photochemistry
- Fq′/Fm′:
-
PSII operating efficiency
- Fq′/Fv′:
-
PSII efficiency factor
- NPQ:
-
Non-photochemical quenching
- PAR:
-
Photosynthetic active radiation
- PEPC:
-
Phosphoenolpyruvate carboxylase
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Acknowledgments
This research was partly funded by the Ministry of Flemish Community (IWT-project LANDBOUW 60667/PCS). The authors would like to thank Philip Deman and Geert Favyts of the Laboratory of Plant Ecology and Benny De Geest of Research Centre for Ornamental Plants for technical assistance. The authors are also very grateful to Dirk Stockx and Vera Paltousova for their assistance in the lab at the Laboratory of Chemical Analysis.
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Communicated by A. Altman.
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Pollet, B., Vanhaecke, L., Dambre, P. et al. Low night temperature acclimation of Phalaenopsis . Plant Cell Rep 30, 1125–1134 (2011). https://doi.org/10.1007/s00299-011-1021-2
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DOI: https://doi.org/10.1007/s00299-011-1021-2