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Allelopathic potential of tea ( Camellia sinensis (L.) Kuntze) on germination and growth of Amaranthus retroflexus L. and Setaria glauca (L.) P.Beauv.

Summary
Laboratory and greenhouse experiments were conducted to determine the effects of tea (Camellia sinensis (L.) Kuntze) extracts (leaf, flower and fruit) at different concentrations on germination and growth of garden cress (Lepidium sativum L.), lettuce (Lactuca sativa L.), redroot pigweed (Amaranthus retroflexus L.) and golden foxtail (Setaria glauca (L.) P.Beauv.). Furthermore, the effects of dried residues of tea on leaf area and dry weight of redroot pigweed and golden foxtail were investigated. Concentrations ranged from 0, 2.5, 5 to 10 % for organ extracts and dried residues were tested in mixtures with perlite at rates of 0, 8, 16, 24 and 32 g kg-1. Polyethylene glycole (PEG) was used in order to distinguish between the inhibitory effect of possible allelopathic substances and effects caused by the osmotic potential of the extracts. Results showed that garden cress and redroot pigweed germination was reduced by all extracts of tea organs with the exception of the leaf extract at the lowest concentration. The same was observed for lettuce and golden foxtail where germination was inhibited with the exception of leaf and fruit extracts at a concentration of 2.5 %. Radicle growth was affected at all test plants used and at all extract concentrations. Lettuce hypocotyl growth was reduced by all extracts of tea organs with the exception of the flower extract at the 2.5 % concentration. Hypocotyl growth of the other test plant species was significantly reduced by all extracts of tea organs as compared with the untreated control. Radicle growth was more sensitive in comparison to hypocotyl growth. Leaf area and dry weight of root, shoot and leaf were significantly lower with tea organ residues incorporated in the growing medium especially at rates of 24 and 32 g kg-1. Low PEG concentrations (1.06 and 2.13 %) had no significant effects on garden cress and lettuce.

german version

Keywords/Stichworte:Allelopathy; Camellia sinensis ; germination; growth; weeds

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Autor:A. REZAEINODEHI, S. KHANGHOLI, H. KAZEMI, Department of Horticulture, University of Shahed, Tehran, Iran, e-mail: rezaeinodehi@shahed.ac.ir;
M. AMINIDEHAGHI, Department of Agronomy, University of Shahed, Tehran, Iran, e-mail: amini@shahed.ac.ir

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