Copper effects on photosynthetic activity and membrance leakage of Azolla filiculoides and A. caroliniana

The toxic effects of copper on the photosynthetic apparatus and cell membrane stability of Azolla species were evaluated by means of the chlorophyll fluorescence, leakage of electrolytes and total phenolic compounds. Different collects from Azolla filiculoides (Xalapa & Ensenada) and A. carolini...

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Bibliographic Details
Published in:International journal of agriculture and biology 2010-05, Vol.12 (3), p.365-368
Main Authors: Sanchez-Viveros, G. (Colegio de Postgraduados Campus Montecillo, Texcoco (Mexico). Area de Microbiologia), Gonzalez-Mendoza, D. (Universidad Autonoma de Baja California (Mexico). Instituto de Ciencias Agricolas), Alarcon, A. (Colegio de Postgraduados Campus Montecillo, Texcoco (Mexico). Area de Microbiologia), Ferrera-Cerrato, R
Format: Article
Language:English
Subjects:
APPLICATION RATES
AZOLLA
CELL MEMBRANES
CHLOROPHYLLS
COPPER
COPPER SULPHATE
ELECTROLYTES
FLUORESCENCE
NUTRIENT SOLUTIONS
PHENOLIC COMPOUNDS
PHOTOSYNTHESIS
SPECIES
STABILITY
TOXICITY
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Summary:The toxic effects of copper on the photosynthetic apparatus and cell membrane stability of Azolla species were evaluated by means of the chlorophyll fluorescence, leakage of electrolytes and total phenolic compounds. Different collects from Azolla filiculoides (Xalapa & Ensenada) and A. caroliniana (CEG) were incubated with different Cu2+ concentrations (0.02, 0.2, 1 & 2 mM) for 36 h in a plant growth chamber. The results showed that treatments with higher Cu concentration (1 & 2 mM) presented clear signs of disrupted photosystem II, since the potential photochemical yields (Fv/Fm) were lower than the control responses. However, membrane permeability (leakage of electrolytes) of both species significantly enhanced with the increase in Cu concentration after 12 h of exposure. Additionally, total phenolic constituents of both species did not differ significantly by Cu concentrations excepting for lower doses of Cu (0.02 mM) after 36 h of exposure.
ISSN:1560-8530
1814-9596