Phytotoxic Effect of Xanthium occidentale Leaf Extract on Seed Germination and Early Seedling Growth of Alfalfa and Barnyard Grass
2004
Chon, S.U. (Dongshin University, Naju, Republic of Korea), E-mail: [email protected]
Compositae plants are known to contain biologically active substances that are allelopathic to agricultural crops as well as weed species. Aqueous extracts from leaves of Xanthium occidentale were assayed against alfalfa (Medicago sativa) to determine their allelopathic effects, and the result showed that the extracts applied onto filter paper significantly inhibited seed germination as well as root growth of alfalfa. Untreated seeds germinated in 60h, but extract concentrations greater than 30g L-¹ delayed seed germination. The extracts significantly inhibited seed germination of alfalfa, and β-amylase activity of alfalfa and barley seeds during 24-36 hours after treatment.
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