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Abstract

The present studies focus on the phytotoxic effects of four crude extracts viz-viz n-hexane, ethyl acetate, methanol and butanol of two plants Thuja orientalis and Thevetia peruviana at two different concentrations i.e, 10 mg/ml and 1 mg/ml against wheat grains germination. Wheat grains (Triticum aestivum) germination percentage, germination velocity, root inhibition percentage, root shoot length, seedlings fresh dry weights and moisture content was determined. Maximum inhibition of germination was exhibited by n-hexane and butanol concentrations of Thuja orientalis and ethyl acetate of Thevetia peruviana. Germination velocity was reduced at maximum level by n-hexane and butanol extracts of Thuja orientalis and Thevetia peruviana respectively. Butanol and methanol extracts of Thuja orientalis and Thevetia peruviana were highly effective in reducing the shoot length while maximum reduction in root length was exhibited by ethyl acetate and n-hexane extracts of the two plants respectively. Ethyl acetate extract of both the plants was most effective in root inhibition against wheat grains. Maximum reduction in seedling moisture content was recorded in seedlings treated with methanolic extract at the same concentration of Thuja orientalis and Thevetia peruviana. Over all the phytotoxic effects of both the plants for all the parameters were more pronounced at 10 mg/ml concentration.
Keywords: Allelopathic; Thuja orientalis; Thevetia peruviana; Triticum aestivum
http://dx.doi.org/10.19045/bspab.2017.60085