Author(s): A. MANDAL, P. TARAI, S.K. KAUSHIK,A.C. MAHATA AND P. HAKARBORTI

Abstract: Allelopathy refers to the advantageous or detrimental effects of one plant on another plant by liberating the chemicals from its components through leaching, root exudation, volatilization, residue decomposition and others in natural and agricultural systems. The present study has been made to appraise the allelopathic action ofRauwalfia tetraphylla L. touching to the alteration of germination, exaggeration of seedling and biochemical actions in gram seed (Cicer arietinum L.). Various concentrations of (12.5, 25, 50, 100, 150, and 200 mg ml-1) aqueous extracts were prepared from root of R. tetraphylla L. and germination studies were conducted. The medium concentrations (50 mg ml-1 and 100 mg ml-1) of root extracts stimulated the seed germination, growth and biochemical constituents (total sugar, protein, amino acid and DNA and RNA concentrations) of gram. In higher concentrations a more or less stagnant nature was observed in all the parameters after T4. A significant variation is found among all treatments considering seedling parameters where, seed treatment is always better than control. In biochemical observations, the view is more or less same where T4 (100 mg ml-1) is indicating highest performance excepting fresh and dry weight. The enhanced action in occurrence of root extract can be supportive for early establishment of seedlings especially in water stress location. Therefore, the said treatment can he considered as an invigoration treatment under seed/crop production programme.

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