Economic Botany: Applied Plant Biology
Yen, Tsair-Bor , Su, Yu-Ho , Chiang, Yu-chung , Chang, Chi-I , Chou, Chang-Hung .
Allelopathic Potential of Litchi chinensis Sonn.
Litchi chinensis Sonn., a family of Sapindaceae, is a subtropical commercial orchard crop. Field observations revealed that the leaf residues of L. chinensis suppress the growth of barnyard grass in its surroundings. Therefore, this study is to evaluate the allelopathic potential of leaf residues from L. chinensis. The aqueous and methanol extracts were examined against Lactuca sativa L., Brassica chinensis L., Raphanus sativus L. and Medicago sativa L. by standard sponge bioassay and pot experiments. Compared with the aqueous extract from leaf and shoot, the aqueous extract of leaf showed much better suppression on the radicle growth of all tested seeds. The highest inhibitory effect on radicle growth was found on lettuce (L. sativa). The inhibitory effect was increased as the tested concentration increased. The ethyl acetate and dichloromethane fractions of leaf methanol extract showed significant phytotoxic effects on the radicle growth. The major compound, proanthocyanidin A1, was isolated and exhibited excellent inhibitory effect on the radical growth of B. chinensi and M. sativa at the concentration of 500 μg/ml. In addition, several unknown compounds with allelopathic potential are isolated and the structure elucidation is in progress. The findings indicated that L. chinensis exhibited distinguished allelopathic potential and could be potentially used as a natural herbicide in the future.
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1 - National Pingtung University of Science and Technology, Department of Tropical Agriculture and International Cooperation, 1 Hseuh-Fu Rd., Nei-Pu Hsiang, Pingtung, 912, Taiwan
2 - National Pingtung University of Science and Technology, Institute of Biotechnology, No.1, Sheuh-Fu Rd. Nei-Pu, Pingtung, 912,, Taiwan
3 - National Pingtung University of Science and Technology, Department of Life Science, No.1, Sheuh-Fu Rd. Nei-Pu, Pingtung, 912,, Taiwan
4 - China Medical University, Research Center for Biodiversity, Taichung, 404, Taiwan
Presentation Type: Poster:Posters for Topics
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM