Allelopathic effects of native plant species Dicranopteris dichotoma on invasive species Bidens pilosa and Eupatorium catarium

摘要

We studied the inhibitory effects of native plant Dicranopteris dichotoma (Thunb.) Bernh on the growth and development of two invasive weed species i.e. Bidens pilosa L. and Eupatorium catarium Veldkamp in Hainan Province, China. The effects of aqueous extracts of leaf, stem and root of D. dichotoma were examined on the seeds germination and seedlings growth of two invasive test species. Increasing extracts concentration of leave, stem and root of D. dichotoma decreased the root length, shoot length and dry weight of E. catarium as well as B. pilosa. The 1.5 % leaf extract of D. dichotoma proved most inhibitory to seeds germination, survival rate and dry weight of E. catarium, while inhibitory to seeds germination, survival rate, root and shoot length, and dry weight of B. pilosa. GC-MS analysis revealed the highest percentage of 2,3-Butanediol (34.65 %) in N-trimethane extract while in carbinol leave extract phenol,2,4-bis(1,1-dimethylethyl)-(28.36 %) was present in highest percentage. In N-trimethane extract of stem, the highest percentage was of 2,3-Butanediol (78.14 %). While in carbinol stem extract, there was highest percentage of Dodecanoic acid, 1,2,3-propanetriyl ester (41.52 %). In the root extract of N-trimethane the highest percentage was of 2,3-Butanediol, (R-(R*,R*)-(91.68 %). In carbinol root extract, the highest percentage was of Dodecanoic acid, 1,2,3-propanetriyl ester (69.25 %). Allelopathic effects of extracts from this native plant D. dichotoma on two invasive species may be caused by the high concentration of compounds identified by GC-MS analysis.