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Allelopathic potential of Alliaria petiolata and Lepidium perfoliatum , two weeds of the Cruciferae family

Summary
Allelopathic potential of two weeds of the cruciferae family, namely garlic mustard ( Alliaria petiolata (M. Bieb.) Cavara & Grande) and clasping pepperweed ( Lepidium perfoliatum L.), on lettuce ( Lactuca sativa L.) and garden cress ( Lepidium sativum L.) was studied in germination assays applying donor plant extracts. Weed plant parts were dried individually at 60 °C and then ground. Each plant's powder was used to produce aqueous extracts of 10 % (w/v) concentration. After centrifugation and filtration, the extracts were diluted with double distilled water to concentrations of 2.5 and 5 %, whereby double distilled water was used as control. The experiment was carried out in a factorial design with two levels of weed, two levels of test plant and four levels of extract concentration. Results showed that weed extracts had a similar and significant inhibitory effect on germination percentage of each of test plant with increasing extract concentration. Radicle growth of both of test plants and hypocotyle growth of lettuce also were decreased with increasing extract concentration. However, garden cress hypocotyl growth was decreased only in response to garlic mustard extracts while extracts of the second weed at first caused an increase in hypocotyl growth at concentrations of 2.5 and 5 % and a decrease only at a concentration of 10 %. Overall negative allelopathic effects on lettuce growth parameters were greater than on garden cress.

german version

Keywords/Stichworte:Allelopathy; aqueous extract; germination; growth; weeds

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

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