Introduction
Ethio. J. Appl. Sci. Technol. Vol(4):65-75(2013) 65
ORIGINAL ARTICLE
In vitro Nematicidal (Anthelmintic) Property of the Seed
Extracts of Anamirta cocculus (Linn.) Against Pheretima
posthuma (L. Vaill.)
Umer Qadir and Paul, V.I.*
Department of Zoology, Annamalai University, Annamalainagar 608 002, Tamil Nadu,
Corresponding author: Dr. V.I. Paul, Associate Professor, Department of Zoology ,
Annamalai University, Annamalainagar 608 002, Tamil Nadu, INDIA,
Tel: +91 9443046081, E-mail:
ABSTRACT
Anamirta cocculus is a wild climber having antibacterial and piscicidal properties. It
is used in Ayurvedic and folk medicines. The primary objective of the present study
was to evaluate the in vitro nematicidal or nematodicidal (anthelmintic) activity of
methanol, chloroform and petroleum ether extracts of the seeds of
A. cocculus using the
earthworm
Pheretima posthuma as an experimental model. After calculating the ½ an hour
LC50s of all the extracts, the time taken for paralysis as well as death of the worms in each
of the extracts was tested using three concentrations each viz.,10, 15 and 20 mg mL–1. All
the three extracts produced significant anthelmintic activities in a dose dependent
manner. The nematicidal activities of the extracts were either significantly higher or
more or less equal to the reference drug Albendazole. Highest nematicidal activity was
shown by the methanol extract (20 mg mL–1) with the paralysis and death time of 30.3
and 60.2 minutes respectively. Moreover, methanol extract exhibited an increased paralytic
as well as nematicidal effect over the reference drug Albendazole at all the given
experimental concentrations. The results indicated the strong probability of the
A.
cocculus seeds as the potential raw material for developing an effective nematicide that
may be highly useful in controlling the plant parasitic nematodes.
Keywords: Albendazole,
Anamirta cocculus, Anthelmint, earthworm, nematicide,
Pheretima posthuma
Umer and Paul 66
historical documents, the plant was used in
the treatment of bronchitis, chronic skin
Plants and plant products are widely
diseases, foul ulcers, dermatophytosis,
used in the traditional and folk
phthisis, inflammation, vertigo, flatulence,
medicines throughout the world.
epilepsy, chorea, paralysis of pharynx, leg
Similarly, plants form the basis of
and respiratory centre, breast cancer and
some important drugs that have been
mastitis (Krishnaraju
et al., 2006; Mati and
frequently used in Ayurveda, Siddha and
de Boer, 2011; Satya and Paridhvi, 2012).
Unani system of medicines. Many of
these plants are known to have
Due to the easy availability, handling
convenience as well as anatomical and
and nematicidal or
physiological resemblance of earthworms
nematodicidal, (antihelmintic) properties.
with nematodes, the former have been widely
Parasitic nematodes are of serious
utilized for evaluating nematicidal (anthelmintic)
concern not only to the animal world
activity (Sollamann, 1918; Dabadi
et al., 2011;
but also to many of the economically
Ilango
et al., 2011; Preeti
et al., 2012; Elias
et al.,
important plant species (Ellis
et al.,
2013). Nematode worms, feed on organic
matter, bacteria, insects and plants.
Approximately 10% of all nematodes feed
Majority of the nematode (helminth)
on plants and live around or in the roots. The
infections are generally limited to
most well known form is the root knot
tropical regions and are prevalent
nematode (
Meloidogyne spp.). This is mainly
particularly in third world countries of
because of the distinctive galls it causes on
tropical regions due to poor helminth
infected roots, its wide distribution, and the
management practices and can pose
wide range of plants that it attacks (e.g.,
large economic and health problems
common vegetables, ornamentals, fruit tree
(Dhar
et al., 1982; Agrahari
et al., 2011).
etc.) (Bridge
et al., 1990). One of the major
Chemical control of nematodes coupled
crops suffering from nematode attack is
with improved crop management has
banana (
Musa spp.) and the common plant
been the important worm control
parasitic nematodes attacking banana are
strategy especially for plant parasitic
Radopholus
Pratylenchus
nematodes throughout the world.
Helicotylenchus multicinctus and
Meloidogyne spp.
(Gowen and Queneherve, 1990). Foliar feeder
development of resistance in nematodes
(
Aphelenchoides spp.) is one of the few plant-
including helminths (Geert and Dorny,
parasitic nematodes which live in and
1995; Coles, 1997) against anthelmintics
damage leaves, buds, and other soft tissues of
have led to the proposal of screening
plant parts that are above the ground
phytochemicals for their control. In
(Pokharel and Larsen, 2007). Lesion
traditional systems of medicine also,
nematodes (
Pratylenchus neglectus and
various indigenous plants and plant
Pratylenchus thornei) reduces yield as much
parts are used as antihelmintics.
as 70% in susceptible spring wheat varieties
Anamirta cocculus (Linn.) is a wild
with little or no visual symptom
climber that has been exploited
expression in the crop canopy, whereas
variously by human beings for different
Pratylenchus vulnus is the most common
applications including Ayurvedic and
root lesion nematode in fruit crops,
folk medicines (Satya and Paridhavi,
causing damage in apple, peach, cherry,
2011). It has been suggested to possess
and grapes (Mai and Mullin, 1975).
anti-inflammatory, anti-fungal, anti-microbial,
insecticidal, germicidal, antioxidant and
In India nematode attack is prevalent in case of
anthelmintic properties (Satya and
many crops such as banana, cotton, tomato etc.
Paridhavi, 2012). In the
While nematode infestation is the basic reason
Ethio. J. Appl. Sci. Technol. Vol(4):65-75(2013) 67
for low yield of cotton per hectare in India (319
endosperms were packed in the thimble of
kg lint/hectare) as compared to other countries
the Soxhlet apparatus and were extracted
like Israel (1709 kg lint/hectare) (Gokte-
separately with methanol, chloroform and
Narkhedkar
et al., 2006), it causes root and corn
petroleum ether solvents for 72 hrs. Each
disease in banana leading to 20-50% fruit yield
extract was concentrated using rotary
loss (Koshy and Sosamma, 2001; Jonathan and
vacuum evaporator and the dried extracts
Sreenivasan, 2013). In case of tomato, one of the
were stored separately for further bioassays
major cause of yield loss in India is root
by following Qadir
et al. (2014).
knot nematode (Saravanapriya and
Sivakumar, 2005; Kumar and Khanna,
Earthworms
2006). Even though attempts to control plant
parasitic nematodes are widespread, biological
Adult Indian earthworms,
P. posthuma of nearly
methods including biopesticides are less
equal size (121 cm) having anatomical and
common with a few exceptions where
physiological resemblance with helminths
antagonistic fungi like
Arthrobotrys dactyloides
(nematodes) (Vigar, 1984; Shivkar and Kumar,
have been explored to trap and parasitize plant
2003) were collected from moist soil, Bhopal,
pathogenic nematodes (El is
et al., 2008). The
Madhya Pradesh, India and were brought to
widespread method of controlling plant
the laboratory and used for the experiment.
nematodes is by applying toxic chemicals
such as aldicarb, carbofuran, phorate etc.,
Estimation of LC50
that could end up with environmental as
well as health issues (Gokte-Narkhedkar
Prior to the commencement of anthelmintic
et al., 2006). So there is a need to explore plant
activity evaluation, static bioassays were
origin biopesticides to curb nematode infestation
conducted to calculate ½ an hour (½h)
in crop plants. In this context, attempts have
median lethal concentration (LC50) of the
been made in the present work to evaluate the
three solvent extracts of the seeds of
A.
nematicidal activity of three solvent extracts of
cocculus on
P. posthuma by following
APHA
the seeds of the piscicidal plant
A. cocculus
et al.(1992). Irrespective of their sex, groups
by taking the Indian earthworm
Pheretima
of ten adult
P. posthuma were kept in
posthuma as an experimental model because
sterilized Petri plates in triplicate and static
anthelmintic/nematicidal studies are usually
bioassays were done with methanol,
carried out using
P. posthuma as an experimental
chloroform and petroleum ether extracts of
model (Kirtiman, 2012; Majumder, 2013;
A. cocculus seeds. The exposure concentrations
Chander
et al., 2014; Das
et al., 2014).
of all the extracts were prepared by
dissolving the desired quantity of the
MATERIALS AND METHODS
respective extract in mg mL–1proportion in
10% propylene glycol prepared in normal
Plant material
saline. Appropriate control groups were
also maintained by applying 10% propylene
The seeds of
A. cocculus belonging to the
glycol prepared in normal saline without
family Menispermaceae
were collected
the addition of extracts. The dead worms
from the wild from Kerala state, India
from each of the Petri plates were removed
and were dried properly before the
after the completion of the fixed time
commencement of the experiment.
interval (½h) and the mortality rates were
recorded. The ½h LC50 for each of the three
Preparation of seed extracts
extracts was calculated using their percentage of
mortality by following Probit method of Finney
Endosperms were collected from the dried
seeds of
A. cocculus and were powdered
with the help of an electric grinder. Five
hundred grams each of the powdered
Umer and Paul 68
Anthelmintic bioassay
Statistical analysis
Three different concentrations (10, 15, 20
Chi-square (2) test was used to check the
mg mL–1) each of the three extracts were
heterogeneity of the data used for calculating the
prepared in 10% propylene glycol in normal
LC50 values. Results with P<0.05 were
saline. Albendazole was prepared by
considered as statistical y significant and the 95%
dissolving it in normal saline at
fiducial level of upper and lower confidence
concentrations of 10, 15 and 20 mg mL–1 to
limits for each of the lethal concentrations was
serve as a reference drug. Experimental
also calculated. The obtained data in each group
control consisted of 10% propylene glycol in
were compared with the respective reference
normal saline and normal control consisted
group using Student‟s„t‟ test.
of normal saline only. The earthworms were
washed with normal saline to remove all
RESULTS AND DISCUSSION
debris, feacal matter etc., and were acclimatized
to the laboratory condition before the
Median lethal concentrations of the three
experimentation.
extracts of
A. cocculus seeds against
P.
posthuma are shown in Table 2. The worms
Anthelmintic activity was assayed following
were more sensitive towards methanol
Nargund (1999) and Nayak
et al. (2009) with
extract when compared to other extracts
some minor modifications using
P.
and correspondingly it showed the lowest
posthuma. Six earthworms each were placed
in separate Petri dishes containing three
50, LC90 and LC99 values value. The
toxicities of the other two extracts were
different concentrations (10, 15, 20 mg mL–1)
significantly (P<0.05) lesser than that of
each of
A. cocculus extracts (methanol,
methanol extract. No mortality was observed
chloroform and petroleum ether) in
in the control groups.
triplicate along with standard reference
drug (Albendazole), experimental control
The summary of the nematicidal activity of
and normal control. The worms were
the seed extracts (methanol, chloroform and
observed for paralysis and death at room
petroleum ether) of
A. cocculus in terms of
temperature. The mean time for paralysis
its anthelmintic effect is given in Table 3. It
was noted when there was no movement of
any kind by the earthworms except when
concentrations (10, 15, 20 mg mL–1) of
the worms were shaken
/ prodding vigorously.
methanol, chloroform and petroleum ether
Death was confirmed when the worms do
extracts of the seeds of
A. cocculus showed
not even revive in normal saline. The time
significant anthelmintic activity. In any case,
of death of worms (min) was recorded after
the anthelmintic activity was either
ascertaining that worms neither moved
significantly higher or more or less equal
when shaken nor when given external
to the reference drug Albendazole (Table
stimuli or normal saline that was followed
with fading of the body color, which means their cellular death (Preeti
et al., 2012). The results from treated groups were compared with reference group, experimental control as well as normal control. Details regarding the composition of the experimental set up are summarized in Table 1.
Ethio. J. Appl. Sci. Technol. Vol(4):65-75(2013) 69
Table 1. Composition of the experimental setup (in triplicate)
Six earthworms + methanolic extract (10 mg mL–1)
Six earthworms + methanolic extract (15 mg mL–1)
Six earthworms + methanolic extract (20 mg mL–1)
Six earthworms + chloroform extract (10 mg mL–1)
Six earthworms + chloroform extract (15 mg mL–1)
Six earthworms + chloroform extract (20 mg mL–1)
Six earthworms + petroleum ether extract (10 mg mL–1)
Six earthworms + petroleum ether extract (15 mg mL–1)
Six earthworms + petroleum ether extract (20 mg mL–1)
10 10 (Experimental control)
Six earthworms + 10% propylene glycol in normal saline
11 (Normal control)
Six earthworms + normal saline
Six earthworms + Albendazole in normal saline (10 mg mL–1)
Six earthworms + Albendazole in normal saline (15 mg mL–1)
Six earthworms + Albendazole in normal saline (20 mg mL–1)
All the extracts produced significant
at 20 mg mL–1 with the paralysis and
anthelmintic activity in a dose
death time of 30.3 and 60.2 min
dependent manner. While methanolic
respectively. Methanol extract exhibited
extract showed minimum time needed
an increased paralytic as well as
for paralysis and death of the
anthelmintic effect over the reference
earthworms, petroleum ether extracts
drug Albendazole at the given
showed maximum time needed for
experimental concentrations (Table 3).
paralysis and death (Table 3). Methanol
The potency of the extract was found to
extract at all the three concentrations
be inversely proportional to the time
(10, 15, 20 mg mL–1) was more effective
taken for paralysis and death of worms.
than the other two extracts as well as
reference drug in their respective
concentrations. Highest anthelmintic
activity was shown by methanol extract
Umer and Paul 70
Table 2. 1/2h LC50, LC90 and LC99 values of seed extracts of
A. cocculus against
P.
*Significant at P<0.05.
Another important observation was the
affect the median lethal concentrations
progression in the toughness and rigidity
since they lie within 95% confidence limit.
of the cuticular layer of the paralyzed
The steepness of the slope also indicates a
worms that were exposed to the extracts. In
sharp increase in the mortality rate with a
comparison to the control ones, the
small increase in the exposure concentration.
cuticular layer of the treated worms
Further, on extrapolation of percentage of
became tough and rigid as the time
mortality, a near 100% mortality of the
elapsed. The progression of toughness and
worms could be predicted at the
rigidity of the cuticular layer intensified as
calculated ½h LC90 (Table 2) of the seed
the death of the earthworms approached
extracts of
A. cocculus. Therefore the
and could be felt by touching the dead
calculated ½h LC99 may be considered as
worms. The rate of mortality caused by
A.
the absolute acute concentration causing
cocculus seed extracts points to the relationship
100% mortality in the stipulated exposure
between percentage of mortality and
time interval. Previous report (Qadir and
concentration of the extracts. The
Paul, 2014) on controlling the yellow stem
significant 2 values (Table 2) indicate that
borer of paddy using aqueous extract of
mortality rates are not significantly
A.cocculus also revealed such toxicological
heterogeneous and variables such as
characters of
A. cocculus seeds.
individual variations do not significantly
Ethio. J. Appl. Sci. Technol. Vol(4):65-75(2013) 71
Table 3. Summary of the
in vitro wormicidal activity (in triplicate) of various extracts of the
seeds of
A. cocculus on
P. posthuma
Group Concentration
Methanol extract
Chloroform extract
Petroleum ether extract
Experimental control (10%
propylene glycol in normal saline) Normal control (normal saline)
Albendazole (reference)
Based on Student‟s „t‟ test; n=18 in each group; comparison made with the respective reference group; NS= not significant; **p<0.01; *p<0.05.
In this context, on the basis of the
to kill
P. posthuma. Irrespective of such
results of lethal concentrations assays
variations in the potencies, all the three
(Table 2) as well as previous reports
extracts exhibit significant nematicidal /
(Preeti
et al., 2012; Majumder, 2013; Das
et
anthelmintic activities. Methanol extract
al., 2014), the treatment concentrations for
shows the highest level of nematicidal
anthelmintic assays (Table 3) were selected
potency as well as paralytic activity and
in such a way that it corresponds to the
thereby making it the best candidate for
lowest concentrations of the commonly
formulation of biopesticide for the
available reports and at the same time
control of nematode infestation in
above the ½h LC99. This could ensure
plants. Agrahari
et al. (2011) also
maximum mortality in reasonably
observed significant anthelmintic
activity
minimum time. The three preliminary
in the case of methanol extract of
Jussiaea
extracts of the seeds of
A. cocculus
hyssopifolia. Recently Qadir
et al. (2014)
show significantly different durations
have observed rich presence of alkaloids,
for paralysis and death of the earthworms
saponins, phenolic compounds and
at different concentrations (Table 3)
flavonoids in the methanolic extract of
A.
indicating significant variations in the
cocculus. They have also reported that
toxicological potencies of the extracts.
while alkaloids are present in the
Qadir
et al. (2014) also observed the
petroleum ether extract, chloroform
variation in the toxicities of seven
extract possesses saponins and phenolic
extracts of
A. cocculus seeds and reported
compounds. Many of these components
that methanol extract was the most toxic
are known to have antiseptic and
one to inhibit microbial growth. The
antimicrobial activities. While alkaloids
present study is also in agreement with
and phenolic compounds are reported to
the reports of Qadir
et al. (2014) that
have sedative as well as anthelmintic
methanol extract is the most potent one
Umer and Paul 72
properties, saponins are well known
The body surface of nematode is a collagen
antimicrobial and antiseptic agents
rich extra cellular matrix forming the
(Tiwari
et al., 2011; Visweswari
et al.,
protective cuticle of the organism and is
2013). Saponins also function as
critical for its viability (Page and Winter,
molluscicidal as well as anthelmintic
2003). The phenolic compounds are shown
agents (Wang
et al., 2010; Tiwari
et al.,
to bind with the glycoprotein on the cuticle
2011; Visweswari
et al., 2013). The
of the parasite (Thompson and Geary,
combined action of the various bioactive
1995) or interfere with energy generation
compounds present in the methanolic
process in helminth parasites by uncoupling
extract in the
A. cocculus seeds might be
oxidative phosphorylation (Martin, 1997)
responsible for its prominent nematicidal
and cause the death of the parasite. In
action than the other two extracts.
leather industry, plant origin phenolic
According to Puupponen-pimia
et al.
compounds are commonly used in the
(2001) and Doughari (2012); alkaloids
tanning operation that imparts structural
and phenolic compounds present in
alteration and stability to collagen of skin
plants have an inherent defensive
matrix through its reactivity and hence
make the collagen molecule to aggregate
into fibers. Such aggregations results in the
loss of flexibility in the collagen matrix
In fact, the present study indicates that
(Vidyadhar
et al., 2010). The possibility of
the methanol extract of
A. cocculus is
such a chemical interaction between the
more effective than the reference drug
nematode cuticle and the phenolic
Albendazole in its anthelmintic activity,
compounds of
A. cocculus extract also
making it a potential source of
cannot be ruled out. Such an interaction in
biopesticide to effectively manage the
the nematode parasites could also result
nematode parasites of plants. Previous
in the aggregation as well as loss of
reports indicate that the size of the
flexibility in their cuticular collagen
organism in many cases is directly
leading to its toughness and thereby
related to the concentration of the
affecting various physiological functions.
toxicant needed to kill it and therefore
At this juncture, it is important to note the
anthelmintic activities are generally
toughness experienced in the cuticular layer
demonstrated by finding out a
of the paralyzed earthworms immediately
particular concentration of the extract
before the death in the present study. Such
that can kill
P. posthuma in a given
morpho-physiological changes might
interval of time based on the concept
have contributed to the paralysis and
that the same concentration of the
death of the exposed worms.
extract shall wipe out the tiny
helminthes/ nematodes (Bachaya
et al.,
Further, saponins which are present in the
2009; Agrahari
et al., 2011; Preeti
et al.,
methanolic and chloroform extracts of
A.
2012). Therefore, nematode parasites of
cocculus (Qadir
et al., 2014) are also
plants being comparatively very small
reported to have anthelmintic activity.
organisms when compared to the
According to Bachaya
et al. (2009), lethal
experimental organism (
P. posthuma), a
effect of saponins against helminths
concentration of the extract that cause
(nematodes) may be due to vacuolization
mortality in
P. posthuma could cause
and disintegration of integuments in them.
death of the tiny nematode parasites of
The minimum nematicidal activity observed in
plants if properly exposed to it. This
the petroleum ether extract (more or less similar
could be attained by treating the
to Albendazole) of the present study may be
concerned plant/plant part (e.g.,
attributed to the absence of phenolic
rhizome of banana before planting)
compounds, saponins and flavonoids and
with the extract.
presence of alkaloids in it (Qadir
et al.,
Ethio. J. Appl. Sci. Technol. Vol(4):65-75(2013) 73
2014) as the latter affect the central
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