Allelopathic impacts of Mikania micrantha Kunth were investigated on the rate of seed germination, growth, biomass, photosynthetic pigments, total soluble protein, phenolics and proline content of Macrotylama uniflorum (Lam.) Verdc. The extracts inhibited germination, growth, biomass, chlorophyll, carotenoid and protein contents. The protein content of M. uniflorum decreased to 8.48 mg/g at 200 mg/ml. Similarly shoot length, root length also decreased up to 5.11 cm, 0.85 cm respectively and water content increased with increasing concentration of weed extracts. The leaf extracts resulted in an increase in the phenolics (19.66 mg) and proline (24.49 mg) content of the crop plant. The aqueous extracts of leaves caused detrimental impact on growth and physiology of the crop plant and this might be due to release of secondary metabolites. This present investigation may further lead to identification of certain secondary metabolites or allelo-chemicals for agricultural application and might enhance the level of crop protection against several other harmful plant species.
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