sodininkystė ir daržininkystė 25(4)

SODININKYSTË IR DARÞININKYSTË. SCIENTIFIC ARTICLES. 2006. 25(4).
BIOMETRIC INDEXES OF CARROT IN RESPONSE
TO DIFFERENT UV-B RADIATION
S. Sakalauskienë, A. Brazaitytë, J. Sakalauskaitë, J. B. Ðikðnianienë,
G. Samuolienë, P. Duchovskis
Summary
Vegetative experiments were carried out in Laboratory of Plant Physiology at
the Lithuanian Institute of Horticulture under phytotron conditions in 2005. The aim
of the study was to establish the impact of different UV-B doses on biometric indexes
of carrots. Plants were treated with different UV-B doses: 0 (reference), 1, 3, 5,
7 ir 9 kJ m -2 d -1 . A photoperiod of 16 h was used and air temperature of 21/17°C
(day/night) was maintained throughout the experiment. Biometric measurements of
plants and photosynthesis productivity were determined at the end of treatment, two
weeks and four weeks after the treatment. The UV-B dose of 1kJ m 2 d -1 stimulated the
physiological processes in the plants. The greatest content of dry weight in carrots
rhizocarp was accumulated applying this dose. The UV-B doses of 5and 7 kJ m -2 d -1
induced the adaptive mechanisms in carrots.
Key words: biometry, Daucus sativus Röhl., UV-B radiation.
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