Phytotoxic Effects of Leaf Leachates of an Invasive Weed Synedrella Nodiflora and Characterization of its Allelochemical

摘要

Synedrella nodiflora (L.) Gaertn. (Asteraceae) a dominant invasive weed from Ganeshkhind area has affected the phytodiversity of Pune University campus (M.S., India). Its leaf leachates inhibited seed germination and seedling growth in test crops like tomato and brinjal at all the concentrations indicating their phytotoxic nature. However maximum inhibition was recorded at higher concentrations (17.5 – 20% of original stock solution). The allelopathic leaf leachates had also adversely influenced the seedling physiology in both the vegetables. Hence to investigate its phytotoxic nature, isolation and characterization of allelochemicals in it, was undertaken. Leaf samples of Synedrella showed the presence of a ketone 3-(5-(1-(3-methylpentyloxy) propyl)-tetrahydro-2- oxofuran-3-yl)-dihydrofuran-2(3H)-one.