Environmental factors affecting flowering of rice flower (Ozothamnus diosmifolius,Vent.) |
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| Institution: | 1. Laboratory of Veterinary Surgery, Department of Veterinary Clinical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Kita-ku, N18 W9, Sapporo, Hokkaido 060-0818, Japan;2. Laboratory of Anatomy, Department of Biomedical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Kita-ku, N18 W9, Sapporo, Hokkaido 060-0818, Japan;3. North Lab, Shiroishi-ku, Hondori2, Kita8-35, Sapporo, Hokkaido 003-0027, Japan;4. Veterinary Teaching Hospital, Graduate School of Veterinary Medicine, Hokkaido University, Kita-ku, N18 W9, Sapporo, Hokkaido 060-0818, Japan;1. Departments of Medicine and Pediatrics, Medical University of South Carolina, 96 Jonathan Lucas St, Room 812-CSB, MSC 630, Charleston, SC 29425, USA;2. University of Queensland, Level 7, Centre for Child Health Research, Graham St, South Brisbane, Queensland 4101, Australia;3. Lady Cilento Children''s Hospital, 501 Stanley St, South Brisbane 4101, Australia;4. Division of Respirology, Keenan Research Centre of Li Ka Shing Knowledge Institute, Department of Medicine, St. Michael''s Hospital, University of Toronto, 1 King''s College Circle, 6263 Medical Sciences Building, Toronto, ON M5S 1A8, Canada;5. Johnson & Johnson Medical Devices, 325 Paramount Dr, Raynham, MA 02767, USA;6. Vertex Pharmaceuticals Incorporated, 50 Northern Avenue, Boston, MA 02210, USA;7. Vertex Pharmaceuticals (Europe) Limited, 86-88 Jubilee Avenue, Milton Park, Abingdon, Oxfordshire OX14 4RW, UK;8. National Heart and Lung Institute, Imperial College, London, UK;9. Department of Pediatric Respiratory Medicine, Royal Brompton and Harefield National Health Service Foundation Trust, Sydney Street, London SW3 6NP, UK;10. Department of Pediatrics, University of Colorado School of Medicine, 13123 E 16th Ave, Aurora, CO 80045, USA;1. Department of Genetic Medicine, Johns Hopkins University (JHU), Baltimore, MD, 21205, USA;2. University of North Carolina at Chapel Hill (UNC), Chapel Hill, NC, 27599, USA |
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| Abstract: | Rice flower (Ozothamnus diosmifolius, Vent.), native to east Australia, is a spring flowering perennial shrub. It is a new cut flower plant, recently introduced into cultivation in Australia and in Israel. Its response to environmental conditions, which affect growth and flowering, are not yet known. The purpose of the present study was to evaluate the effects of growth temperature, photoperiod and total solar energy on flowering. Experiments were conducted with plants of the cv. Cook’s Snow White. Plants were grown in three cycles under controlled conditions in the phytotron, at four day/night temperature regimes: 17/9, 20/12, 23/15 and 26/18°C. Two photoperiods — short day (SD) of 10 h natural day light and long day (LD) of 10 h natural light plus 10 h incandescent light — were employed. High temperatures enhanced vegetative growth but blocked flowering under both LD and SD. Under medium–moderate temperatures plants were absolute LD plants and did not flower under SD conditions. Under lower temperatures plants flowered under both LD and SD, but SD delayed flowering. High total solar radiation under LD did not affect flowering time but greatly promoted the number of flowering stems. |
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