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SODININKYSTĖ IR DARŽININKYSTĖ. SCIENTIFIC ARTICLES. 2009. 28(4).
Cadmium impact on photosynthesis and growth of pea (Pisum sativum L.)
plants at different development stages
I. Januškaitienė, A. Dikšaitytė
Summary
The aim of this work is to investigate the impact of heavy metal cadmium on photosynthesis
rate and growth of pea (Pisum sativum L.) plants at different development stages. Peas
were sown in vegetative pots with prepared peat substrate (6.0–6.5 pH). Ten (leaf development
stage) and seventeen (formation of lateral shoots stage) days after germination the plants
were exposed to different cadmium concentration. Investigated 1 and 6 mM concentrations
decreased photosynthesis rate of pea leaf development stage 11.5 % (p > 0.05) and 29.5 %
(p < 0.05), and lateral shoots formation stage – 8.2 (p > 0.05) and 30.7 % (p < 0.05), respectively.
When cadmium impact was strong (6 mM), dry overground biomass of leaf development
stage of pea plants was nearly 2 times smaller than this during formation of lateral
shoots as compared to reference treatment. Pea plants of leaf development stage were more
sensitive to different cadmium impact intensity than these during formation of lateral shoots.
Key words: cadmium, growth stage, photosynthesis rate, dry biomass, pea, Pisum
sativum L.
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