title: Allelopathic potential of Trifolium resupinatum and T. alexandrium on seed germination of four weed species.
abstract: Laboratory studies were conducted to determine the seed germination of Amaranthus retroflexus, Convolvulus arvensis, Secale cereale and Sinapis arvensis as affected by water-and methanol-soluble constituents of Persian and Berseem clovers. Aboveground tissues of the clovers were collected during flowering stage and dried. Three concentrations of aqueous and methanolic extracts were used: full-strength (33.3 g L(-1)), half-strength (16.7 g L(-1)) and quarter-strength (8.3 g L(-1)). The weed seeds were placed in petri dishes contained the legume extract, or distilled water (control). Percent seed germination was taken after a week. In general, seed germination of the weed species declined progressively with increasing concentration of the clover extracts. It was found that wild mustard exhibited the greatest sensitivity to both the legume extracts. Compared with aqueous extract, methanolic extract caused more decline in seed germination of the weeds. In addition, compared to Persian clover, Berseem clover was stronger inhibitor of seed germination. Therefore, the amounts of allelochemicals may be different in these clovers. Field bindweed showed the least sensitivity to both the legume extracts. Therefore, field bindweed had probably more tolerance to the allelochemicals produced by the clover species.
authors.affiliation: Department of Weed Research, Plant Pests and Diseases Research Institute, P.O. Box 19395-1454, Tehran, Iran.
authors.forename: Fariba
authors.initials: F
authors.lastname: Maighany
authors.forename: Mahlagha
authors.initials: M
authors.lastname: Ghorbanli
authors.forename: Javad
authors.initials: J
authors.lastname: Khalghani
authors.forename: Morteza
authors.initials: M
authors.lastname: Najafpour
mesh_terms: D004305:Dose-Response Relationship, Drug; D018525:Germination / Q000187:drug effects* / Q000502:physiology; D010675:Pheromones / Q000494:pharmacology*; D012639:Seeds / Q000187:drug effects* / Q000502:physiology; D029921:Trifolium / Q000187:drug effects / Q000502:physiology
chemical_list: D010675:Pheromones