The Effect of Photosynthetic Active Radiation and Temperature on Growth and Flowering of Ten Flowering Pot Plant Species


Hibiscus rosa-sinensis, Rosa sp. (miniature roses), Sinningia speciosa, Gerbera hybrida, Kalanchoe blossfeldiana, Hydrangea, Begonia x hiemalis, Calceolaria, Cyclamen persicum and Pelargonium domesticum were grown at six photon flux densities (85, 130, 170, 215, 255 and 300 μmol·m-2·s-1, PFD) during lighting periods of 20 h·day-1 at three air temperatures (18°C, 21°C and 24°C) in midwinter at latitude 59° north. This corresponded to photosynthetic active radiations (PAR) ranging from 6.1 to 21.6 mol·m-2·day-1. Time until flowering decreased in all species except Cyclamen when the temperature increased from 18°C to 21°C, particularly at lower PFD levels. A further increase in temperature, from 21°C to 24°C, clearly decreased time until flowering in six of the ten tested species. Generally, this represented a reduction in the time until flowering between 20% and 40%. The dry weight of the plants at time of flowering increased up to 170 μmol·m-2·s-1 PFD (12.2 mol·m-2·day-1 PAR) in Hibiscus, miniature rose, Kalanchoe and Pelargonium, while the dry weight reached a maximum at 85 to 130 μmol·m-2·s-1 PFD mol·m-2·day-1 (6.1 to 9.4 mol·m-2·day-1)in the other species. Based on the present results a PAR level of 6 to 8 mol m-2·day-1 is recommended for Calceolaria and Cyclamen, of 8 to 10 mol·m-2·day-1 for Sinningia, Gerbera, Kalanchoe, Hydrangea and Begonia, of 10 to 12 mol·m-2·day-1 for Pelargonium and of 12 to 15 mol·m-2 day-1 for Hibiscus and miniature roses.

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Mortensen, L. (2014) The Effect of Photosynthetic Active Radiation and Temperature on Growth and Flowering of Ten Flowering Pot Plant Species. American Journal of Plant Sciences, 5, 1907-1917. doi: 10.4236/ajps.2014.513204.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Hidén, C. and Larsen, R.U. (1994) Predicting Flower Development in Greenhouse Grown Chrysanthemum. Scientia Horticulturae, 58, 123-138.
[2] Adams, S.R., Pearson, S., Hadley, P. and Patefield, W.M. (1999) The Effect of Temperature and Light Integral on the Phases of Photoperiod Sensitivity in Petunia x hybrid. Annals of Botany, 83, 263-269.
[3] White, J.W. and Warrington, I.J. (1998) Temperature and Light Integral Effectson Growth and Flowering of Hybrid Geraniums. Journal of American Society for Horticultural Science, 113, 354-359.
[4] Steininger, J., Pasian, C.C. and Lieth, J.H. (2002) Extension of Thermal Unit Model to Represent Nonlinearity in Temperature Response of Miniature Rose Development. Journal of American Society for Horticultural Science, 127, 349-354.
[5] Moccaldi, L.A. and Runkle, E.S. (2007) Modeling the Effects of Temperature and Photosynthetic Daily Light Integral on Growth and Flowering of Salvia splendens and Tagetespatula. Journal of American Society of Horticultural Science, 132, 283-288.
[6] Blanchard, M.G. and Runkle, E.S. (2011) Quantifying the Thermal Flowering Rates of Eighteen Species of Annual Bedding Plants. Scientia Horticulturae, 128, 30-37.
[7] Agricultural Meteorological Service (LMT) Bioforsk, Norway.
[8] PVCDROM, 2.5 Solar Radiation Data, Average Daily Solar Radiation.
[9] IPCC (2013) Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. In: Stocker, T.F., Qin, D., Plattner, G.-K., Tignor, M., Allen, S.K., Boschung, J., Nauels, A., Xia, Y., Bex, V. and Midgley, P.M., Eds., Climate Change 2013: The Physical Science basis, Cambridge University Press, Cambridge.
[10] Jiao, J., Tsujita, M.J. and Grodzinski, B. (1991) Influence of Radiation and CO2 Enrichment on Whole Plant Net CO2 Exchange in Roses. Canadian Journal of Plant Science, 71, 245-252.
[11] Mortensen, L.M., Ringsevjen, F. and Gislerød, H.R. (1012) The Effect of CO2 Concentration on the CO2 Exchange Rate in a Small Plant Stand of Cucumber during Different Periods of the Day. European Journal of Plant Science, 77, 24-30.
[12] Hückstädt, A., Suthaparan, A., Mortensen, L.M. and Gislerød, H.R. (2013) The Effect of Low Night and High Day Temperatures on Photosynthesis in Tomato. American Journal of Plant Sciences, 4, 2323-2331.
[13] Mortensen, L.M. (2014) The Effect of Wide-Range Photosynthetic Active Radiations on Photosynthesis, Growth and Flowering of Rosa sp. and Kalanchoe blossfeldiana. American Journal of Plant Sciences, 5, 1489-1498.
[14] Gislerød, H.R., Eidsten, I.M. and Mortensen, L.M. (1989) The Interaction of Daily Lighting Period and Light Intensity on Growth of Some Greenhouse Plants. Scientia Horticulturae, 38, 295-304.
[15] Mortensen, L.M. (2014) The Effect of Photon Flux Density and Lighting Period on Growth, Flowering, Powdery Mildew and Water Relations of Miniature Roses. American Journal of Plant Sciences.
[16] Mortensen, L.M. (1987) CO2 Enrichment in Greenhouses. Crop Responses. Scientia Horticulturae, 33, 1-25.
[17] Taub, D.R., Seemann, J.R. and Coleman, J.S. (2000) Growth in Elevated CO2 Protects Photosynthesis against High-Temperature Damage. Plant, Cell and Environment, 23, 649-656.
[18] Warner, R.M. and Erwin, J.E. (2005) Prolonged High Temperature Exposure and Daily Light Integral Impact Growth and Flowering of Five Herbaceous Ornamental Species. Journal of the American Society for Horticultural Science, 130, 283-288.
[19] Karlsson, M.G., Heins, R.D. and Gerberick, J.O. (1991) Temperature Driven Leaf Unfolding Rate in Hibiscus rosa-sinensis. Scientia Horticulturae, 45, 323-331.
[20] Blanchard, M.G., Runkle, E.S. and Fisher, P.R. (2011) Modeling Plant Morphology and Development of Petunia in Response to Temperature and Photosynthetic Light Integral. Scientia Horticulturae, 129, 313-320.
[21] Karlsson, M. and Werner, J. (2001) Temperature Affects Leaf Unfolding Rate and Flowering of Cyclamen. HortScience, 36, 292-294.

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