Plant Soil Environ., 2007, 53(12):511-516 | DOI: 10.17221/2191-PSE

Photosystem II of barley seedlings under cadmium and lead stress

H.M. Kalaji1, T. Loboda2
1 Department of Plant Physiology, Warsaw University of Life Sciences, Warsaw, Poland
2 Department of Sanitary Biology and Biotechnology, Bialystok University of Technology, Bialystok, Poland

Chlorophyll a fluorescence measurements were carried out on two barley (Hordeum vulgare L.) cultivars Arabi Abiad and Arabi Aswad at 8 and 14 days after emergence to identify their early tolerance mechanism for heavy metals (25 and 50μM of cadmium and lead). Transient fluorescence curves (OJIP curves) and energy flux models showed different specific reactions of photosystem II (PSII) of each cultivar to each type of stress. After 7 days of lead stress application plants of cv. A. Aswad showed weaker I and P peaks on the OJIP curve than control plants, and the appearance of a new K step; parameters of phenomenological energy fluxes for cv. A. Abiad were similar to those for control plants and only some silent reaction centers appeared. Generally, parameters of energy fluxes within PSII were directly shifted shortly (24 h) after the application of both heavy metals, especially in the case of plants grown under cadmium treatment. This suggests that these parameters could be good indicators for monitoring of these two pollutants in the environment at early stages of plant development.

Keywords: OJIP-test; chlorophyll fluorescence; heavy metals; bioenergetics

Published: December 31, 2007  Show citation

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Kalaji HM, Loboda T. Photosystem II of barley seedlings under cadmium and lead stress. CAAS Agricultural Journals. 2007;53(12):511-516. doi: 10.17221/2191-PSE.
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