Low night temperature acclimation of Phalaenopsis |
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Authors: | Pollet Bruno Vanhaecke Lynn Dambre Pieter Lootens Peter Steppe Kathy |
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Institution: | (1) Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, 9000 Ghent, Belgium;(2) Laboratory of Chemical Analysis, Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium;(3) Research Centre for Ornamental Plants (PCS), Schaessestraat 18, 9070 Destelbergen, Belgium;(4) Plant Sciences Unit, Institute for Agricultural and Fisheries Research (ILVO), Burg. Van Gansberghelaan 109, 9820 Merelbeke, Belgium |
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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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