This research was conducted to assess the allelopathic potential of 100
plants species, including noxious weeds and medicinal plants of Malaysia as
donor plant on the growth of Lactuca sativa (lettuce) as the recipient
plant. This study was also carried out to justify common weeds found in
Malaysia to act as a natural herbicide for weed management through
Methodology: Weed and medicinal plant species commonly found in
Malaysia were identified according to their morphological characteristics.
Sandwich method was carried out to determine the allelopathic potential of
weed species through leaf litter leachate mechanism. On the other hand, dish
pack method was conducted to discover the allelopathic potential of weed
species through volatilization pathway.
100 weed species and medicinal plants commonly found in Malaysia inhibited
the radicle and hypocotyl growth of L. sativa by both sandwich method
and dish pack method. Among 100 weed species, Passiflora foetida showed the
maximum inhibitory effects on L. sativa growth in both sandwich and
dish pack method. The highest amount of P. foetida leaf litter (50
mg), completely inhibited the growth of radicle and hypocotyl of L.
sativa. Volatilization of weed and medicinal plants leaf litter inhibited
the growth of L. sativa with increasing distances of lettuce seed with
the weed and medicinal plants leaf litter.
Interpretation: The findings of this study provides a
base line for identifying plants with allelopathic properties for controlling
Allelopathic potential, Allelopathy, Leaf litter leachate, Noxious weed,