Allelopathic Potential and Phytochemical Screening of Some Medicinal Plants of Nepal
Date
2013
Authors
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Publisher
Department of Botany
Abstract
The laboratory tests were conducted to evaluate the allelopathic potential and
phytochemical study of the four selected medicinal plants Ageratum conyzoides,
Eclipta prostrata, Cannabis sativa and Woodfordia fructicosa . The aqueous extract
bioassay of the plants with leaf, stem and root were conducted on the two test seeds
wheat and pea by filter paper method. Germination, seedling growth and biomass
production were observed under the allelopathic study wheras under phytochemical
study qualitative or presence or absence and quantitative or crude amount of the
phytochemicals present were also estimated. Data analysis was done by SPSS version
16. For the allelopathic studies the germination and seedling growth of wheat and pea
test species under the different concentrations 2% ,4% ,6% ,8% and 10% of the leaf,
stem and root extracts of the plants under study were carried out. Increased
concentration of the aqueous extracts of the plants increased the inhibitory rate or
decreased the germination and seedling growth. Generally leaf extract showed lower
germination rate than the other parts. There was significant difference for the plumule
length and rootlegth of wheat from that of control except for the radicle length of the
C. sativa root extract. In pea, no significant difference was seen for A. conyzoides
root, C. sativa stem and root and E. prostrata stem extract. Biomass production was
maximum in W. fructicosa and least in A. conyzoides stem extracts in pea .In wheat
maximum in C. sativa and minimum in E. prostrata extracts. Wheat was found
sensitive to E. prostrata and W. fructicosa extracts wheras pea plant was found more
sensitive to A. conyzoides and C. sativa extracts. Alkaloid, flavonoid, saponin, tannin,
phenol, glycoside and essential oil were the phytochemicals present in the plant
extracts.
Key words: Allelopathic potential, Phytochemical study, medicinal, bioassay,
germination, seedling, biomass production, sensitive, crude
Description
Keywords
Allelopathic potential, Medicinal plants, biomass production, Phytochemical study