Pollution Research Paper

Vol. 36, Issue 4, 2017; Page No.(863-869)

PHYTOTOXIC EFFECTS OF AQUEOUS STEM EXTRACT OFPARTHENIUM HYSTEROPHORUS L. ON SEED GERMINATION ANDSEEDLING GROWTH ON PISUM SATIVUM

RAJ SHIKHA AND ASHOK KUMAR JHA

Abstract

The present work was carried out to evaluate the phytotoxic effect of Parthenium hysterophorus onseed germination, root length, and shoot length and fresh weight of root & shoot of Pisum sativumunder laboratory condition of the Department of Botany, J.P.University, Chapra. Different levels ofstem aqueous extract concentrations (15%, 25%, 50%, 75% and 100%) were used for this experiment.Experiments were carried out taking ten replicates of each treatment. Higher concentrations of 75%and 100% aqueous stem extract of Parthenium drastically reduced the germination per cent of peas.The rate of seed germination varied from 46.67 to 100% in different concentrations of stem extractof Parthenium in pea being minimum (46.67%) for 100% treatment and maximum(100%) for 15%treatment whereas this value was 100% in control condition.SVI(Seed Vigour Index) values rangedfrom 56.19 to 127.94 in comparison to control condition (197.21). Statistical analyses, i.e. standarderror, t-test, linear regression equations and correlation co-efficient values were calculatedbetween root and shoot length and were compared with the values for control condition. t-testvalues for root length between control and 75% and 100% were highly significantly different(p<0.001) whereas other values were not significantly different; and for shoot length all values werehighly significantly different (p<0.001). The phytotoxicity of stem extract of Partheniumhysterophorus is the main cause of reduction in the rate of seed germination and seedling growthof Pisum sativum. Higher concentrations were more toxic to peas than lower concentrations of stemextract of P. hysterophorus.

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