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Bioassays with Prosopis juliflora (Swartz) DC. demonstrated that aqueous root, shoot and fruit extracts against Lactuca sativa, a cultivated species and two field associates viz. Chloris barbata and Cassia holosericea impeded or reduced germination of test species. The fruit extract was more inhibitory than shoot or root extract. The suppression of germination and seedling growth was in the order: Cassia holosericea < C. barbata < L. sativa. Reduction in seedling growth was species specific. In general, inhibition was a function of the extract concentration. Decaying P. juliflora shoot was relatively more toxic to germination and seedling growth of T. aestivum. Artificial rain-drip arrested lettuce seedling growth at higher concentration only. Root and shoot extracts were autotoxic to P. juliflora seedling growth at higher concentrations only. Fruit extract was, however, more autotoxic to germination and seedling growth. Phytotoxic principles of P. juliflora were thermostable or thermo-convertible to secondary inhibitors. The physico-chemical nature of soil and the soil microorganisms provided limited protection to lettuce seedling growth against toxicity of the extracts. Coleoptile bioassay of ether fraction of aqueous extracts indicated some phenolic inhibitors in the extracts. Radicle growth bioassay of Brassica compestris with crude saponins, extracted by precipitation method using lead acetate, indicated some active saponins /glycosides in the extracts. The toxic effects of P. juliflora extracts further facilitated explanation to the simplicity of sociological organization in P. juliflora dominated stands.
D. Khan, S. Shahid Shaukat. (2006) PHYTOTOXIC EFFECTS OF PROSOPIS JULIFLORA SWARTZ. DC. AGAINST SOME OF ITS FIELD ASSOCIATES AND THE CULTIVATED SPECIES, , Volume 3, Issue 2.
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