Abstract

In West Bengal, India, Desmostachya bipinnata L. Stapf (Poaceae), Parthenium hysterophorus L. Asteraceae and Alternanthera sessilis L. R. Br. ex DC. (Amaranthaceae), are three weeds with potential allelochemicals. An investigation therefore was carried out for the determination and evaluation of their allelopathic potential in terms of relative allelopathic potential. Allelochemicals in various concentrations [1:5, 1:10 and 1:20 (w/v)] of leaf extracts and leachates of the three weeds respectively were tested on Allium cepa root tips which is generally a very responsive bioassay material for sensing allelopathic property. Cytological evaluation of allelopathic potential is done by microscopic study of allelochemical induced alterations of cytological characters with particular reference to various anomalies during cell-division and chromosomal structural abnormalities like condensation, pole deviation, anaphase bridge, clumping, bi-nucleation, depurination, fragmentation, stickiness, multinucleate cells, late separation with micronuclei formation. Chromosomal Abnormality Index reveal that Desmostachya bipinnata> Parthenium hysterophorus > Alternanthera sessilis in terms of allelopathic potential inducing chromosomal abnormalities in Allium cepa root tips indicating that the monocotyledonous weed Desmostachya is more allelopathically vigorous than the other two dicotyledonous weeds- Parthenium and Alternanthera. Further research is thus required to know the interaction of other invasive dicotyledonous and monocotyledonous weeds on other weed and crop species giving newer dimensions to allelopathy research.

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