sodininkystė ir daržininkystė 25(4)

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SODININKYSTË IR DARÞININKYSTË. SCIENTIFIC ARTICLES. 2006. 25(4).
THE COMPLEX EXPOSURE OF TEMPERATURE AND
UV-B IRRADIATION ON PHYSIOLOGICAL INDICES IN
STRAWBERRY
A. Urbonavièiûtë, G. Samuolienë, J. Sakalauskaitë, P. Duchovskis, A. Brazaitytë,
J. B. Ðikðnianienë, G. Ðabajevienë, K. Baranauskis, S. Sakalauskienë
Summary
Experiments were performed at the Lithuanian Institute of Horticulture, phytotron
complex in 2005–2006. The object of this study was to evaluate the complex
exposure of temperature and UV-B irradiation on physiological indices in strawberry.
The effect of 0, 2 and 4 kJ irradiation doses on growth parameters, photosynthetic
pigment and carbohydrates contents was investigated when environmental temperature
was 21/14°C and 25/16°C. Chlorophyll and carotenoid content was evaluated
using spectrophotometric method, while carbohydrates – using high performance
liquid chromatography. Short-term UV-B exposure has no significant effect
on strawberry biometric parameters. Though the increase in photosynthetic pigment
and carbohydrate contents, when plants were exposed to 2 kJ irradiation indicate
that these conditions are optimal for growth at optimal and high temperature. Higher
temperature itself is a stress factor, although at higher temperatures, strawberry
carbohydrate system is less sensitive to different UV-B irradiation doses.
Key words: strawberry, carbohydrates, photosynthetic pigments, leaf area, UV-B
irradiation, fresh weight.
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