Allelopathic potential of Adhatoda visica NEES
1989
Ayaz, Sajjida | Hussain, Farrukh | Ilahi, Ihsan (Univ. of Peshawar, Peshawar (Pakistan). Dept. of Botany) | Kil, B.S. (Wonkwang Univ., Iri (Korea R.). Dept. of Science Education)
Adhatoda vasica Nees is a shrubby component of tropical and subtropical vegetation in Pakistan. It harbours relatively few unhealthy associated species in and around its thickets. Aqueous extracts, rain leachates, litter from shoots and soil underneath it invariably reduced germination, early growth, biomass, moisture and chlorophyll contents of Pennisetum americanum, Setaria italica, Zea mays, Brassica compestris and Triticum vulgare in different laboratory experiments. Chromatographic analysis revealed the presence of caffeic, ferulic, vanillic, p-coumaric, p-OH-benzoic, and tannic acids in aqueous extracts. The phytotoxicity was related to the test species used, part assayed and parameter measured. It is suggested that the preclusion of the associated species and the dominance of A. vasica is primarily due to allelopathy. Negative grazing also provides better chances for its establishment
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