Article

Allelopathic potential of two sesquiterpene lactones from Magnolia grandiflora L.

Department of Pesticide Chemistry, Faculty of Agriculture, 21545 El-Shatby, Alexandria University, Alexandria, Egypt; Department of Biochemical Science and Technology, Faculty of Agriculture, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
Biochemical Systematics and Ecology DOI:10.1016/j.bse.2007.06.009 pp.737-742

ABSTRACT The allelopathic effects of the two sesquiterpene lactones, costunolide and parthenolide, isolated from the leaves of Magnolia grandiflora L. were evaluated on the wheat (Triticum aestivum L.), lettuce (Lactuca sativa L.), radish (Raphanus sativus L.) and onion (Allium cepa L.). Seed germination of the test species was significantly reduced at 500 μg/ml by both compounds. Both sesquiterpenes showed pronounced inhibition of root length of the test species and the inhibitory effect was concentration-dependent. In addition, shoot growth of the four species was significantly inhibited at all the concentrations tested (10–500 μg/ml). Parthenolide reduced germination and inhibited seedling growth more than costunolide. Inhibition of root growth was generally greater than that of shoot growth. The results encourage the use of these sesquiterpenes as models for development of new herbicides.

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Keywords

allelopathic effects
 
Allium cepa L.). Seed germination
 
costunolide
 
four species
 
inhibited seedling growth
 
inhibition
 
lettuce
 
models
 
new herbicides
 
Parthenolide
 
Raphanus sativus L
 
sesquiterpenes
 
test species
 
two sesquiterpene lactones
 

Samir A M Abdelgaleil