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- W917249916 abstract "Changes of some photosynthetic parameters were studied in younger and older leaves of cabbage plants (Brassica oleracea L., cv. Gloria di Enkhouizen 2) grown in water solution (pH 5.7) containing Cu(II)-EDTA chelate, in which the molar ratio of the metal (M) to the ligand (L) was 1:0.5 and 1:1. Such parameters as the total leaf area of the plant, younger and older leaf lamina surface and thickness, chloroplast number in mesophyll cells, the concentration of total chlorophyll and photosystem 2 activity were studied at the same concentration of chelate M:L 1:0.5 and M:L 1:1 in the medium (ie 24 mol Cu dm) and at a very similar concentration of Cu in leaves, absorbed from these forms by the plants. The Cu(II)-EDTA chelate in which the molar ratio M:L was 1:0.5 was more toxic than the chelate in which the molar ratio M:L was 1:1. The Cu(II)-EDTA chelate, regardless of the molar ratio M:L, reduced the assimilative surface of plants, decreased the content of the total chlorophyll in the leaves and reduced their phytochemical efficiency. It also reduced the number of chloroplasts in mesophyll cells and induced changes in their ultrastructure similar to the changes taking place during the ageing of leaves. The chelate also caused the reduction of the area of young leaves, accompanied by a higher accumulation of chlorophyll than in the control. The leaves were photochemically efficient and their chloroplasts showed no damage." @default.
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- W917249916 date "2008-01-01" @default.
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- W917249916 title "Changes of some photosynthetic parameters in cabbage (Brassica oleracea L.) leaves caused by excess of Cu(II)-EDTA chelate" @default.
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