ISHS Acta Horticulturae 580: IV International ISHS Symposium on Artificial Lighting
TIME-DEPENDENT EFFECTIVENESS OF UV-TREATMENT ON THE CONTROL OF THE ELONGATION GROWTH OF TOMATO TRANSPLANTS |
| Authors: | L. Bertram, B. Lercari |
| Keywords: | linear transducer, Lycopersicon esculentum, photomorphogenesis, plug plants, stem elongation rate |
| Abstract:
In this research work we have measured the short and long term stem elongation responses of 18 days old tomato plants to different PAR and UV radiation by using linear voltage transducers. We aimed at obtaining a reliable picture of the photoregulation of stem growth of tomato plants, that describes properly the kinetics of stem elongation of fully de-etiolated plants. Since previous work showed time-dependent effectiveness of UV treatments on several plants, we wanted to investigate whether PAR levels influence the time-dependent responsiveness to UV treatments. We provide evidence that the long-lasting changes in effectiveness depends on PAR levels. These data suggest that in order to control stem elongation under low PAR, UV treatments should be given in the first half of the night or of the day, while under higher PAR (> 400 μmol m-2 s-1) any moment of the day or of the night can be chosen. | |
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