sodininkystė ir daržininkystė 25(4)

Statistical calculations were performed by ANOVA for MS Excel vers. 3.43
(Duncan’s Multiple Range t-test procedure (P ≤ 0.05 and P ≤ 0.01)).
Results. Plant response to UV-B radiation doses under non-stressful conditions
(21/14°C, ambient CO 2
) was very plant species-specific. Significantly lower
amount of UV-absorbing compounds was determined in reference Raphanus sativus
plants, than in those exposed to 2 kJ UV-B doses, but no significant differences
were observed under 4 kJ UV-B doses (Fig. 1 A).
Exposure of Daucus carota plants to 4 kJ UV-B doses resulted in greatest amounts
of UV-screening compound, while 2 kJ doses – in lowest amounts. Hence, the
amount of UV pigments in reference plants remained greater than in plants exposed
to 2 kJ UV-B doses (Fig. 1 B).
Fig. 1. Amount of UV pigments in (A) Raphanus sativus L., (B) Daucus sativus
Röhl., (C) Fragaria ananassa Duch. and (D) Malus domestica leaves under different
UV-B exposure. Means indicated by the different letters are significantly
different (n = 3; P ≥ 0.05)
1 pav. Santykiniai UV sugerianèiø pigmentø kiekiai (A) Raphanus sativus L., (B)
Daucus sativus Röhl., (C) Fragaria ananassa Duch. and (D) Malus domestica
lapuose paveikus skirtingomis UV-B dozëmis. Skirtingos raidës rodo
esminá skirtumà tarp vidurkiø (n = 3; P ≥ 0,05)
In general, UV-B radiation reduced the amount of UV-absorbing pigments in
Fragaria ananassa Duch. leaves, as the amount of those pigments was significantly
greater in the leaves of reference plants than in those treated by 2 or 4 kJ UV-B
doses. The most reduced amount of UV-screening compound was observed under 2
kJ UV-B doses (Fig. 1 C).
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