• Dr. Amitava Nayek

Allelopathic potential of Parthenium hysterophorus was evaluated using its fresh leaf extracts and dry leaf leachates of young, mature and old leaves using black gram (Vigna radiata) seeds as bioassay material. Pretreatment of black gram seeds with different concentrations of aqueous leaf extracts and leaf leachates of the Parthenium for 8 hours reduced percentage and speed of seed germination with concomitant enhancement of the time required for 50% germination (T50) of Vigna seeds. Growth of seedlings, measured in terms of root and shoot length, fresh and dry weight of seedlings, raised from the seeds pretreated with the leaf extracts and leaf leachates were significantly impaired. The seed pretreating agents enhanced deleterious leaching of soluble carbohydrates and free amino acids from the seeds with concomitant reduction of protein and nucleic acids as well as activities of catalase and dehydrogenase. Treatment-induced impairment of chromosomal behaviour during mitosis and reduction of Mitotic Index (MI) were clearly observed. A conclusion is made that the Parthenium hysterophorus possesses allelopathic property.

Allelopathy, Parthenium hysterophorus, Vigna radiata, seed germination behaviour, chromosomal behaviour, mitotic index.

"PHYSIOBIOCHEMICAL AND CYTOLOGICAL ANALYSIS OF ALLELOPATHIC NATURE OF Parthenium hysterophorus L. ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 1, page no.564-570, January-2019, Available :http://www.jetir.org/papers/JETIR1901I76.pdf

"PHYSIOBIOCHEMICAL AND CYTOLOGICAL ANALYSIS OF ALLELOPATHIC NATURE OF Parthenium hysterophorus L. ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 1, page no. pp564-570, January-2019, Available at : http://www.jetir.org/papers/JETIR1901I76.pdf