Cassia tora L. (CT) is a widely growing weed in India with medicinal value and has been reported to
show allelopathic potential causing biological suppression on crops. Th e present study was conducted to observe
its suppression on Brassica campestris L. (mustard). Th e rate of seed germination and the root length, shoot length,
chlorophyll content, fresh weight (FW), dry weight (DW), and relative water content (RWC) of 10-day-old mustard
seedlings were observed aft er treatment with aqueous extracts of the roots, leaves, and seeds of CT and compared with
control sets treated with distilled water. A confi rmatory chemical test was conducted to determine the presence of
phenols, ketones, acids, and alcohols in the CT plant extracts. Diff erent concentrations of the extracts showed inhibition
(up to 100%) or deterioration in all of the parameters. Roots were more aff ected than shoots and the extract taken
from leaves was more suppressive than that taken from other plant parts. Th e FW, DW, and RWC were considerably
reduced upon treatment with the tested extracts. Th e extracts (>25%) also caused a reduction in the chlorophyll content.
Th e overall results indicate the possible suppressive eff ect of allelochemicals (phenols, ketones, acids, and alcohols)
present in CT on mustard. Th e overall results with regard to mustard plants followed the same trend of concentrationdependent
inhibition in the order of leaf > seed > root.