Dual induction control of flowering in Leucanthemum vulgare |
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Authors: | O. M. Heide |
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Affiliation: | Dept of Biology and Nature Conservation, Agricultural Univ, of Norway, P.O. Box 5014, N-1432 As, Norway. |
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Abstract: | The perennial herb Leucanthemum vulgare (oxeye daisy) has a dual induction requirement for flowering. The primary induction is a typical low temperature vemalization response. Temperatures up to 15°C are effective, and the optimum is 6–9°C. Short days (SD) during low temperature exposure enhanced primary induction, but SD could not fully substitute for low temperature in primary induction. At optimum temperatures about 6 weeks exposure were required for 100% flowering, but the flowering response increased with increasing exposure up to 12 weeks, especially at higher temperatures. Seedling have a short juvenile phase of about 4 weeks. Populations with origin ranging from 59 to 69°N in Norway did not vary in their primary induction requirements. Long days (LD) were required for inflorescence initiation and stem elongation at 9°C. At 21 and 15°C some plants initiated and developed inflorescences in SD, but the inflorescences were sessile and their development strongly delayed. More than 16 LD cycles were required for normal stem elongation (bolting). |
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Keywords: | Dual induction flowering Leucanthemum vulgare oxeye daisy photo-period temperature vernalization |
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