Mahmood, I.

Siddiqui, Z.A.

Horizon / Pleins textes

Fundam. appl. NemalOl., 1993,16 (3),215-218
Biological control of Meloidogyne incognita race 3
and Macrophomina phaseolina by Paecilomyces lilacinus
and Bacillus subtilis alone and in combination on chickpea
Zaki A. SIDDIQUI and Irshad MAHMOOD
Department ofBotany, Aligarh Muslim University, Aligarh-202002 India.
Accepted for publication 7 August 1992.
Summary - Paecilomyces lilacinus and Bacil/us sublilis were used for the biocontrol of the root-rot disease complex of chickpea
caused by Meloidogyne incognila race 3 and Maaoplwmina pJwseolina. Individually, P. li/acinus treatment was berrer against
M. incognila while B. sublilis against M. pJwseolina. The combined inoculation of P. li/acinus and B. sublilis improved dry shoot
weight significantly when plants were simultaneously inoculated either with M. incognila or M. pJwseolina or with both.
Résumé - Contrôle de Meloidogyne incognita race 3 et de Macrophomina phaseoli sur pois chiche par Paecilomyces
lilacin.ls et Bacillus subtilis, seuls ou en cmnbinaison - Paecilomyces lllaclilüs et B(uil/us subLilis sont utilisés en vue du contrôle
biologique d'une pourriture racinaire complexe du pois chiche causée par Meloidogyne incognila race 3 et Maerophomina phaseoli.
Employés seuls, Paecilomyces li/acinus est meilleur contre Meloidogyne incognila et Baci/lus subtilis contre Macrophomina pJwseo/i.
L'inoculation combinée de Paecilomyces liuu:inus et de Bacil/us subtilis augmente de façon significative le poids sec des racines lorsque
les plantes sont inoculées, au même moment, par Meloidogyne incogniz.a et Maeroplwmina pJwseo!l~ seuls ou en combinaison.
Key-words : Nemata, Meloidogyne, fungi, Macrophomina, Paecilomyces, bacteria, Bacil/us subtilis, biological control.
Chickpea (Cieer arielinum L.) is an important pulse
crop of India which is susceptible to root-knot nematode
MeloUWgyne incognita (Kofoid & White) Chitwood and
Macrophomina phaseolina (Tassi) Goid. An interaction
between M. incognita race 3 and M. phaseolina has been
reported to cause severe damage on chis important pulse
crop (Siddiqui & Husain, 1992).
The use of micro-organism that can grow in the rhi-
zosphere are ideal for use as biocontrol agents, since
rhizosphere provides the initial barrier against pathogen
attack of the root system (Weiler, 1988). It is now a
common belief that biological control can have an im-
portant role in agriculture.
Paecilomyces li/acinus (Thorns.) Samson has been re-
ported to reduce nematode population densities (Jatala
el al.) 1979; Morgan-Jones el al.) 1984; Jatala, 1986;
Dube & Smart, 1987; Reddy & Khan, 1988) but in
sorne places the results have been inconclusive (Dickson
& Mitchell, 1985). Moreover, Bacillus subtilis Cohn
emend. Prazmowski has also been used as successful
biocontrol agent against plant pathogens (Broadbent el
al., 1977; Yuen et al.) 1985). In the present study these
two biocontrol agents were used individually and simul-
taneously for the management of the fOot-rot disease
cornpIex of chickpea caused by M. incognita race 3 and
M. phaseolina.
Materials and Inethods
Seeds of chickpea cv. P-256 were surface sterilized
with 0.1 % mercuric chloride for 2 minutes and washed
three times with sterile distilled water and treated with
chickpea strain of Bradyrhizobium before sowing. Su-
crose solution was used as sticker for the bacteria. Five
bacteria treated seeds were sown in 15 cm earthen pots
containing 1 kg steam sterilized soil. After germination
the seedlings were thinned to one per pot. One week
after germination the seedlings were inoculated with
2000 freshly hatched juveniles of M. incognita and 1 g
M. phaseolina.
Meloidogyne incognita was called from the chickpea
field and multiplied on eggplant (Solanum melongena L.)
using a single egg-mass. The M. incognita was identified
as race 3 using host differential tests (Taylor & Sasser,
1978). Egg-masses were hand picked using sterilized
forceps and placed in 9 cm diame[er sieves of 1 mm
pore size which was previously mounted with cross lay-
ered tissue paper. The sieves were placed for hatching in
Petri dishes with distilled water in an incubator running
at 27 oc. Two thousand freshly hatched second stage
juveniles were pipetted near fine roots which were ex-
posed by removing the soil carefully and replacing it
after inoculation. The controis were inoculated with dis-
tilled water in the same way.
Macrophomina phaseolina was isolated from chickpea
roots and maintained on potato dextrose agar (PDA).
Fungus inoculum was prepared by cuJturing the isolate
in Richard's liquid medium (Riker & Riker, 1936) for
15 days at 25 oc. Mycelium was collected on blotting
sheets to remove excess water and nutrients; 100 g my-
celium was macerated in 1 1distilled water and 10 ml of
/SSN 1164-5571/93/03/215 04 g 2.40/ © Gauthier-Villars - ORSTOM 215
Table 1. Biological control of Meloidogyne incognila race 3 and
Macrophomina phaseolina by Paecllomyces li/acinus and Bacil/us
subtlils on chickpea.
pathogens resulted in increased dry shoot weight and
nodlÙation over to plants inoculated with pathogens and
treated with biocontrol agents (Table 1). Dry shoot
weight of plants inoclÙated with M. incognila and treated
with biocontrol agents was same to plants treated with
biocontrol agents and M. phaseolina. Moreover, plants
inoculated with both pathogens together and treated
with biocontrol agents reslÙted in the greatest reduction
in dry shoot weight and nodulation. Nematode multipli-
cation and galling was adversally affected by M. phaseo-
lina (Table 1).
Inoculation of plant with biocontrol agents alone re-
sulted in sorne dry shoot weight and nodulation as con-
trol without pathogens. Paecilomyces lilacinus treatment
alone was found effective in improving dry shoot weight
of plants inoclÙated with M. incognila alone or in cornbi-
nation with M. phaseolina (Table 2). The treatment of
P. lilacinus was not effective against M. phaseolina alone.
Bacillus SUblilis effectively increase the dry shoot weight
and nodulation of plants when inoculated with M. in-
cognita or M. phaseolina or both. Paecilomyces lilacinus
and B. Sublilis inoculated together improved dry shoot
weight and nodulation to the greatest extent (Table 2).
Highest reductions in nematode multiplication and
galling were caused when P. lilacinus and B. sublilis were
used tagether followed by P. lilacinus treatment alone.
Bacillus sublilis treatment was least effective in reducing
nematode multiplication and galling (Table 2).
Approximately 40 % of the females and 70 % of the
eggs of M. incognila were found ta be infected with P.
lilacinus when reisolation of the fungus was made from
the final nematode poplÙation. When reisolation of the
bacteria from females and eggs was made the reslÙts
were statistically negative.
Root-rot indices were found 4 and 5 when M. phaseo-
lina was inoculated alone or with M. incognila respec-
tively. The index was found 4 when P. lilacinus was
inoculated with M. phaseolina or M. phaseolina plus M.
incognita. The indices were reduce to 3 and 4 when
Z. A. Siddlqul & I. Mahmood
this suspension containing 1 g fungus was inoculated in
the same manner as were nematodes. Paecilomyces lilaci-
nus was cultured and inoculated in the same manner as
M. phaseolina.
Bacillus Sublilis was inoclÙated 10 ml per plant as soil
drench around the roots. In most studies it has been
used as seed treatment but in the present study Brady-
rhizolYium was used with seeds. The culture of B. sublilis
was prepared on nutrient agar medium (Riker & Riker,
1936). Plates were incubated at 37 oC for 24 h and bac-
terial growth was scraped and dissolved in distilled wa-
ter. Suspension of bacteria were prepared to contain
10 x 108 bacterial cells/ml. The counting of bacterial
cells in the suspension was done by preparing dilutions
upto 10.7 and 0.1 ml suspension of each was carefully
spread on nutrient agar plates (dilution 10.6 and 10.7
separately). Plates were incubated at 37 oC for 24 hours
and bacterial colonies were counted. The inoculations
were done in the same manner as M. phaseolina.
There were four experimental sets (a) without the
treatment of biocontrol agents; (b) treated with P. lilaci-
nus alone; (c) treated with B. sublilis alone; (d) treated
with both biocontrol agents. Ali the experiment sets
were having four treatments viz. control, M. incognila,
M. phaseolina and M. incognila + M. phaseolina. Each
treatment was replicated four rimes and the experiments
were repeated twice. The pots were kept in a rendo-
mized fashion on glass house bench. Pots were watered
when needed and the experiment was terminated 90
days after inoclÙation. Data were recorded on dry shoot
weight, number of nodules and galls, root-rot index and
nematode density. Nematade in soil was extracted by
Cobb's sieving and decanting technique followed by
Baermann funnel (Southey, 1986). The number of juv-
eniles, eggs and females in the roots were also estimated.
The roots were cut into small pieces and mixed, 1 g root
was macerated for 45 seconds in a Waring blender to
recover nematodes eggs, females and larvae. A root-rot
index was determined by scoring the severity of disease
on scale ranging from 0 (no disease) to 5 (severe root-
rot).
Paecilomyces lilacinus and B. sublilis were reisolated
from the eggs and females of M. incognila to determine
the percentage infection on the remaining population.
For reisolation, eggs and females were surface sterilized
with 0.1 % mercuric chloride for 2 min washed three
times in distilled water and placed in potato dextrose
agar and nutrient agar mediwn for fungus and bacterial
growth respectively. The plates were incubated at desir-
ed temperatures as described earlier. The growth of fun-
gus and bacteria if found were identified. Ali the data
collected were analysed statistically using multifactorial
analysis and critical differences (c. D.) were calclÙated
at 5 % level.
Results
Treatments of plants with biocontrol agents without
Treaonents
Control with treaonents
M. 1000gnila (MD effect
M phaswlJna (Ml') effecl
MI +Ml' effect
CD. 5%
Dry shoot No. of Nematode No. of
weight (g) nodules populations galls
per root in 1000 s per root
system system
7.9 46
6.5 32 210 165
6.6 37
5.5 24 14.5 112
0.3 2 0.5 5
216 Fundam. appl. NemalOl.
Biological cOn/Toi on chickpea
Table 2. Biological control of Meloidogyne incogniLa race 3 and MacTophomina phaseolina by Paecilomyces lilacinus and Bacillus
subtilis on chickpea.
Treatrnents Dry shoot No. of Nemarode No. of Reisolation of Reisolation of Root-rot
weighr (g) nodules population galls P. lilacinus B. subtilis Index
per roor in 1000 s in percentage in percentage
system
Females Eggs Females Eggs
Control 7.7 44
M. incognlta (MI) 5.5 28 42.6 286
M. phaseolina (MP) 5.9 31 4
MI + MP 3.5 14 25.8 204 5
Control } 7.9 46
MI 1 g 6.8 37 18.4 142 43 75
MP P. lilacinus 6.4 36 4
MI + MP 5.7 22 11.6 104 38 67 4
Control } 7.8 47
MI 10 ml 6.5 35 20.7 164 4 2
MP B. subtilis 6.9 38 3
MI+MP 5.9 21 14.1 114 2 3 4
Control } 8.0 48MI P. lilacinus 7.1 40 10.2 67 41 73 3 2MP + 7.3 42 2MI + MP B. subtilis 6.7 38 6.3 26 39 65 2 2 4
C.D. 5 % 0.6 4 0.8 10 4 8 4 3
plants inoculated with M. phaseolina or with M. phaseo-
Lina and M. incognita and treated with B. subtilis. The
treatrnents of both biocontrol agents with M. phaseolina
and with both pathogens resulted in 2 and 4 root-rot
indices.
Discussion
The parasitism on M. incognita eggs and females by P.
lilacinus resulted in reduced nematode multiplication
thereby improving plant growth of nematode infected
plants. P. lilacinus infected eggs of M. incognita more
frequently and destroyed the embryo while females were
parasitized through anus. The infection process was
found to begin with the growth of P. lilacinus hyphae in
the gelatinous matrix. The similar parasitism of P. lilaci-
nus has been reported by others Gatala et al., 1979;
Jatala, 1986). BClC'lllus subtilis inhibited both pathogens
either individually or simultaneously. Bacillus subtilis is
known to have inhibitory effects against several plant
pathogens (Broadbent et al., 1971, 1977; Yuen et al.,
1985). Its treatrnent were found effective in increasing
yield of carrot by 48 %, oats by 33 % (Merriman et al.,
1974) and peanuts upto 37 % (Turner & Backman,
1986). The use of B. subtilis may also improve plant
growth by suppressing non-parasitic root pathogen or
by the production of biologically active sustances or by
unavailable minerai and organic compounds into forms
available to plants (Broadbent et al., 1977).
VoI.16,no3-1993
It was concluded that P. lilacinus is successful biocon-
trol agent against root-knot nematode M. incognita while
B. subtilis can be used against both M. incognita and M.
phaseolina. This study suggests that combined inocula-
tion of P. lilacinus and B. subtilis will be best for the
control of this root-rot disease complex as inhibitory
effect of B. subtilis was not effective on the parasitic
behavior of P. lilacinus. However, we feel that combined
application of both organisms as soil drench in field
conditions will be very costly. We were not able to use B.
subtilis as seed treatrnent to reduce the cost of applica-
tion because Bradyrhizobium was used with the seeds.
Further studies are needed on the biological control us-
ing both organism as seed treatrnent without Bradyrhi-
zobium and with Bradyrhizobium.
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Biological control of Meloidogyne incognita race 3 and Macrophomina phaseolina by Paecilomyces lilacinus and Bacillus subtilis alone and in combination on chickpea

Biological control of Meloidogyne incognita race 3 and Macrophomina phaseolina by Paecilomyces lilacinus and Bacillus subtilis alone and in combination on chickpea

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