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| Content Provider | Scientific Research Publishing (SCIRP) |
|---|---|
| Author | Mortensen, Leiv M. |
| Abstract | 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. |
| Starting Page | 1907 |
| Ending Page | 1917 |
| File Format | HTM / HTML PDF |
| ISSN | 21582742 |
| DOI | 10.4236/ajps.2014.513204 |
| Issue Number | 13 |
| Journal | American Journal of Plant Sciences |
| Volume Number | 05 |
| e-ISSN | 21582750 |
| Language | English |
| Publisher Date | 2014-06-05 |
| Access Restriction | Open |
| Subject Keyword | Air Temperature Flowering Growth Photon Flux Density (PFD) Photosynthetic Active Radiation (PAR) Pot Plants Biomedical & Life Sciences |
| Content Type | Text |
| Resource Type | Article |
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