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Molecular Microbiology Research (Online) 2013, Vol.3 No.3 20-29
ISSN 1927-5595
http://mmr.sophiapublisher.com
20
Research Report Open Access
Induced Systemic Resistance and Their Implications in Host Resistance to
Physic Nut against Leaf Blight Disease
S. Narmadhavathy
1
, S. Vanitha
1
, G. Karthikeyan
1
, T. Raguchander
1
,
R. Ramjegathesh
2
1Department of Plant Pathology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore, 641 003, Tamil Nadu, India
2Department of Life Sciences, Faculty of Science and Agriculture, The University of the West Indies, St. Augustine, Trinidad
Corresponding authors email:
ramje_tnau@rediffmail.com;
Authors
Molecular Microbiology Research, 2013, Vol.3, No.3 doi: 10.5376/mmr.2013.03.0003
Received: 04 Jun., 2013
Accepted: 06 Sep., 2013
Published: 10 Dec., 2013
This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and
reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article:
Narmadhavathy et al., 2013,
Induced Systemic Resistance and Their Implications in Host Resistance to Physic Nut against Leaf Blight Disease, Molecular
Microbiology Research, Vol.3, No.3 20-29 (doi: 10.5376/mmr.2013.03.0003)
Abstract
The aim of this work was to study the Induced systemic resistance and their implications in host resistance to physic nut
against leaf blight disease.
In pot culture experiment plant treated with Mancozeb (0.2%) and Propiconazole (0.1%) thrice starting
from 30 days after planting with an interval of 15 days was significantly superior over all the treatments with the PDI of 18.44 and
19.00 respectively. The plant height was significantly increased in all treated plants ranging from 99.80 cm to 148.25 cm. Plants
treated with
Pseudomonas fluorescens
(Pf1) induces more phenyl alanine ammonia lyase (PAL), peroxidise (PO)¸ poly
phenoloxidase (PPO), β-1,3 glucanase, super oxide dismutase (SOD) and phenol activity in treated physic nut plant followed by
Bacillus
EPCO16 treated plants.
Keywords
Bio control agents;
Curvularia clavata
; Defence enzymes; Leaf blight; Micro nutrients; Physic nut; Plant products
1 Introduction
Physic nut (
Jatropha curcas
L
.
) is an important
commercial bio-diesel plant species and is being
advocated for development of waste land and dry land.
In India, the diesel consumption alone was about 38
million tones and the subsidies offered by the Central
Government were Rs. 9,130 crores. Diesel is the most
widely used fuel for transportation purpose apart from
other industrial uses. Therefore, if physic nut oil based
bio-diesel can be used as an extender for mixing with
diesel (about 20 per cent), a huge savings can be made
in terms of not only money value (both on spending
and foreign exchange),but also on the renewable
resource and decrease our dependency on foreign
sources for oil (Paramathma et al., 2006). Among the
several constraints in physic nut cultivation, diseases
play a major role in the yield reduction and it is
affected by many fungal and viral diseases. Among
the foliar diseases, leaf blight disease caused by
Curvularia
clavata
is a major fungal disease.
Considering the importance of the crop, destructive
nature of the disease and availability of limited
information on this pathogen in this crop, the present
studies were undertaken for inducing systemic
resistance against leaf blight disease by the application
of plant oils, micro nutrients and bio agents.
1 Results
1.1. Effect of plant oil, micronutrient, bio control
agents and fungicides against leaf blight disease
under glass house conditions
The results of the pot culture experiment under glass
house conditions showed that foliar application of
Mancozeb (0.2%) and Propiconazole (0.1%) thrice
starting from 30 days after planting with an interval of
15 days was significantly superior over all the
treatments with the PDI of 18.44 and 19.00
respectively on 60 days after planting. Hexaconazole
was the next best which recorded PDI of 22.27
followed by Tricyclazole (24.83 PDI). Among the bio
control agents, Pf1 (0.2%) sprayed pots recorded the
PDI of 26.81while in control the PDI was 56.73. The
plant height was significantly increased in all treated
plants ranging from 99.80 to 148.25cm whereas in
control the plant height was 56.73 (Table 1).