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Agnė Čypaitė, Jūratė Žaltauskaitė, Jonė Venclovienė
Assessment of chlorophyll-a, chlorophyll-b and growth rate in
freshwater green algae Pseudokirchneriella subcapitata exposed
to cadmium and copper
| Conference Information: |
9th International Conference on Environmental
Engineering, MAY 22-23, 2014 Vilnius, LITHUANIA |
| Source: |
ICEE-2014 - International Conference on Environmental
Engineering |
| Book Series: |
International Conference on Environmental Engineering
(ICEE) Selected papers |
| ISSN: |
ISSN 2029-7092 online |
| ISBN: |
978-609-457-640-9 / 978-609-457-690-4 CD |
| Year: |
2014 |
| Publisher: |
Vilnius Gediminas Technical University Press Technika |
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Abstract
In this work, the effect on green algae Pseudokirchneriella subcapitata exposed to different concentrations of cadmium and copper was
evaluated through growth rate and the chlorophyll-a, chlorophyll-b concentrations. The algae were exposed for 7 days to five different
cadmium and copper concentration ranging from 1 to 1000 µg/l. Data show that cadmium was more toxic to Pseudokirchneriella
subcapitata growth than copper, all treatments of cadmium inhibited Pseudokirchneriella subcapitata growth unlike copper, of which
only the highest concentration tested (1000 and 100 µg Cu/l) inhibited the growth of algae cells. Regression analysis revealed that growth
rate of Pseudokirchneriella subcapitata significantly decreased with increasing concentration of metals ions (Cd – R2
= 0.7, p < 0.001;
Cu – R2
= 0.99, p < 0.001. Cadmium and copper had the significant adverse effect on the chlorophyll-a and chlorophyll-b concentrations
of P.subcapitata cells (chlorophyll-a ANOVA, Cd: F
= 10.8, p < 0.001; Cu: F
= 8.1 p < 0.001, chlorophyll-b ANOVA, Cd: F
= 10.16,
p < 0.001; Cu: F
= 10.06, p < 0.001). The results showed that chlorophyll-a and chlorophyll-b concentration were less sensitive to metals
than the growth rate.
Keywords:toxicity; water quality; cadmium; cupper; Pseudokirchneriella subcapitata.
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