Allelopathy Journal
  • Year: 2006
  • Volume: 18
  • Issue: 2

Allelopathic potential and chemical constituents of volatile oil from Praxelis clematidea

  • Author:
  • Z.H. Wang, P. Christie2, Q.B. Chen1, X.X. Liu1, L.L. Xie1, C.J. Bai1, X.L. Li
  • Total Page Count: 12
  • Page Number: 225 to 236

1Rubber Research Institute, Key Lab for Tropical Crop Physiology, CATAS, Danzhou 571737, Hainan, China;

2Tropical Crops Germplasm Resources Research Institute, Chinese Academy of Tropical Agricultural Science, Danzhou 571737, Hainan, China;

Department of Plant Nutrition, China Agricultural University, Beijing 100094, China. E-Mail: lixl@cau.edu.cn

*Correspondence author.

Abstract

The allelopathic potential of volatile oil from Praxelis clematidea was studied using laboratory bioassay and volatile oil analysis was performed by GC-MS. Sesquiterpenes and monoterpenes were the main groups of constituents. The effects of volatile oil were examined on seedling growth of lettuce (Lactuca sativa L) and Brassica rapa L. cv. gr. Caixin. The volatile oil inhibited all the growth parameters in both test species. With the increase in dose of volatile oil, the seedlings growth of both test species was significantly reduced. Besides, the radial growth of fungal colonies (Fusarium oxysporum, Magnaporthe grisea and Phytophthora capsici) was reduced by volatile oil concentrations from 100 mg.L−1 to 1600 mg.L−1 except in M. grisea. Besides, Praxelis volatile oil inhibited the feeding activity and pupation of Spodoptera litura third instar larvae.

Keywords

Allelopathy, anti-fungal activity, Brassica rapa, Fusarium oxysporum, Lactuca sativa, Magnaporthe grisea, Phytophthora capsici, plant growth, Praxelis clematidea, Spodoptera litura, volatile oil