ISHS Acta Horticulturae 711: V International Symposium on Artificial Lighting in Horticulture
INFLUENCE OF PHOTOSYNTHETIC PHOTON FLUX ON FLORAL EVOCATION IN SALVIA × SUPERBA STAPF ´BLAUKÖNIGIN´ |
| Authors: | G. Waaseth, S.O. Grimstad, R. Moe |
| Keywords: | flowering, photosynthetic photon flux, photoperiod, vernalization, sucrose application |
| Abstract:
The transition to flowering in the herbaceous ornamental perennial Salvia × superba Stapf ‘Blaukönigin’ is promoted by increasing the photosynthetic photon flux (PPF), in addition to a facultative response to both vernalization and long photoperiods. Floral evocation occurred at an earlier developmental stage in unvernalized S. superba in response to increasing the PPF from 50 to 200 µmol m-2 s-1 irrespective of photoperiod, although the response was more prominent in 20-hour days compared with short days of 10 hours. After a saturating vernalization treatment, the response to PPF was bypassed when plants were grown in long photoperiods. The promotion of flowering by increasing light quantity seems to be dependent on the ambient light level during the actual evocation process irrespective of the light level received during previous vegetative growth. Further investigations are needed to uncover the response mechanism behind this PPF dependent flowering pathway. | |
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