Articles
CONTROL OF PLANT MORPHOLOGY BY UV-B AND UV-B-TEMPERATURE INTERACTIONS
Article number
956_22
Pages
207 – 214
Language
English
Abstract
Chemical plant growth retardants (PGRs) are used to control height of greenhouse grown plants.
Increasing environmental awareness has strongly promoted interest in alternative methods.
Since UV-B is known to reduce shoot elongation, the use of supplemental UV-B radiation or UV-B and UV-A-transmitting cladding material such as F-clean appears highly interesting.
Substantially reduced shoot elongation was observed in a variety of bedding and pot plants produced in the spring in Norway at 59°N under F-clean compared to polyethylene.
Furthermore, although natural UV levels are low in the autumn at 59°N, a 30% reduction in the use of PGRs as a consequence of reduced shoot elongation was then observed in poinsettia (Euphorbia pulcherrima) under F-clean.
Poinsettia exposed to short diurnal periods of UV-B radiation in the night, also showed reduced internode lengths and increased branching.
Effect of UV-B and its interaction with temperature on morphology was investigated using pea (Pisum sativum) as a model system.
The UV-B stimulated reduction in shoot elongation was substantially enhanced when given in combination with a temperature drop treatment.
Also, plants were then less susceptible to UV-B-induced damage, indicating an effect of temperature reduction on UV-protective mechanisms.
Increasing environmental awareness has strongly promoted interest in alternative methods.
Since UV-B is known to reduce shoot elongation, the use of supplemental UV-B radiation or UV-B and UV-A-transmitting cladding material such as F-clean appears highly interesting.
Substantially reduced shoot elongation was observed in a variety of bedding and pot plants produced in the spring in Norway at 59°N under F-clean compared to polyethylene.
Furthermore, although natural UV levels are low in the autumn at 59°N, a 30% reduction in the use of PGRs as a consequence of reduced shoot elongation was then observed in poinsettia (Euphorbia pulcherrima) under F-clean.
Poinsettia exposed to short diurnal periods of UV-B radiation in the night, also showed reduced internode lengths and increased branching.
Effect of UV-B and its interaction with temperature on morphology was investigated using pea (Pisum sativum) as a model system.
The UV-B stimulated reduction in shoot elongation was substantially enhanced when given in combination with a temperature drop treatment.
Also, plants were then less susceptible to UV-B-induced damage, indicating an effect of temperature reduction on UV-protective mechanisms.
Authors
S. Torre, A.G. Roro, S. Bengtsson, L.M. Mortensen, K.A. Solhaug, H.R. Gislerød , J.E. Olsen
Keywords
morphology, temperature, shoot elongation, UV-B
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