Abstract
The imperial bromeliad Alcantarea imperialis grows naturally on rocky outcrops (‘inselbergs’) in regions where daily temperatures vary from 5 to 40°C. As carbohydrate metabolism is altered in response to cold, it could lead to reprogramming of the metabolic machinery including the increase in levels of metabolites that function as osmolytes, compatible solutes, or energy sources in order to maintain plant homeostasis. The aim of this study was to evaluate the effects of different temperatures on plant growth and non-structural carbohydrates in plants of A. imperialis adapted to low temperature. Seedlings of A. imperialis were grown in vitro under a 12-h photoperiod with four different day/night temperature cycles: 5/5°C, 15/15°C, 15/30°C (dark/light) and 30/30°C. Plants were also cultivated at 26°C in ex vitro conditions for comparison. The results showed an inverse relationship between temperature and germination time and no differences in the percentage of germination. Plants maintained for 9 months at 15°C presented a reduced number of leaves and roots, and a dry mass four times lower than plants grown at 30°C. Sugar content was higher in plants grown at 15°C than at 30°C. However, the highest amount of total sugar was found in plants growing under warm day/cold night conditions. Myo-inositol, glucose, fructose and sucrose were found predominantly under high temperatures, while under low temperatures, sucrose was apparently replaced by trehalose, raffinose and stachyose. Starch content was highest in plants grown under high temperatures. The lowest starch content was detected under low temperatures, suggesting its conversion into soluble carbohydrates to protect the plants against cold. These results indicated that low temperature retarded growth of A. imperialis and increased sugar levels, mainly trehalose, thus suggesting that these sugar compounds could be involved in cold tolerance.
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Acknowledgments
This work is part of MS thesis of L. Mollo in the Plant Biodiversity and Environment Program/Instituto de Botânica, SMASP, São Paulo and was supported by FAPESP (Grant 05/04139-7). The authors thank CNPq for the technical fellowship to M. P. Monteiro. R. C. L. F.-R. is a researcher associated with CNPq. We also thank Dr M. A. M. Carvalho (Institute of Botany, São Paulo) and Dr J. Lunn (MPIMP-Golm) for the English revision and many helpful suggestions regarding this manuscript.
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Mollo, L., Martins, M.C.M., Oliveira, V.F. et al. Effects of low temperature on growth and non-structural carbohydrates of the imperial bromeliad Alcantarea imperialis cultured in vitro. Plant Cell Tiss Organ Cult 107, 141–149 (2011). https://doi.org/10.1007/s11240-011-9966-y
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DOI: https://doi.org/10.1007/s11240-011-9966-y