Articles
The effect of photoperiod and light spectrum on non-infectious phyllody in strawberry Soprano®
Article number
1337_27
Pages
203 – 210
Language
English
Abstract
Phyllody is the abnormal development of floral parts into leafy structures.
In many cultivated plants, also strawberry, phyllody is caused by phytoplasma or virus, although it could be stimulated by environmental factors which result in a plant hormone imbalance.
The objective of this study was to evaluate the effects of photoperiod, light spectrum and chill history on phyllody in everbearing strawberry Soprano®. In two trials tray plants were grown in the glasshouse under three photoperiods with LED-lights during winter (natural day length, 12 or 16 h d‑1). Initially the plants were exposed to different chill regimes, either in the fridge at -1.5°C for 3, 6 and 15 weeks respectively, or in a glasshouse with a minimum temperature setting of 12, 6 or 2°C. In a third glasshouse trial HPS and LED light sources were compared using the same three photoperiods.
In a fourth study in a growth chamber the effects of six different light spectral ratios (red-to-blue-to-green ratios of 9:1:0, 8:2:0, 7:3:0, 6:4:0, 7:2:1 and 6:3:1) were explored.
Resulting effects on fruit physiological abnormalities were subsequently observed at each harvest interval.
Photoperiod and chill played a significant role in flower development.
Chilled strawberry plants consistently gave fewer flowers with phyllody.
Our results proved that under short day and high temperature regimes non-infectious phyllody can be induced in Soprano. High light intensity with HPS resulted in a significant higher incidence of phyllody.
There was not significant effect of light spectrum on the development of phyllody was observed.
In many cultivated plants, also strawberry, phyllody is caused by phytoplasma or virus, although it could be stimulated by environmental factors which result in a plant hormone imbalance.
The objective of this study was to evaluate the effects of photoperiod, light spectrum and chill history on phyllody in everbearing strawberry Soprano®. In two trials tray plants were grown in the glasshouse under three photoperiods with LED-lights during winter (natural day length, 12 or 16 h d‑1). Initially the plants were exposed to different chill regimes, either in the fridge at -1.5°C for 3, 6 and 15 weeks respectively, or in a glasshouse with a minimum temperature setting of 12, 6 or 2°C. In a third glasshouse trial HPS and LED light sources were compared using the same three photoperiods.
In a fourth study in a growth chamber the effects of six different light spectral ratios (red-to-blue-to-green ratios of 9:1:0, 8:2:0, 7:3:0, 6:4:0, 7:2:1 and 6:3:1) were explored.
Resulting effects on fruit physiological abnormalities were subsequently observed at each harvest interval.
Photoperiod and chill played a significant role in flower development.
Chilled strawberry plants consistently gave fewer flowers with phyllody.
Our results proved that under short day and high temperature regimes non-infectious phyllody can be induced in Soprano. High light intensity with HPS resulted in a significant higher incidence of phyllody.
There was not significant effect of light spectrum on the development of phyllody was observed.
Authors
P. Lieten, N. Gallace
Keywords
Fragaria × ananassa, day length, flower abnormalities, everbearer, LED
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