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Studies on ecology, genetic diversity and toxigenicity of Fusarium moniliforme associated with rice Bakanae and its management

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Title Studies on ecology, genetic diversity and toxigenicity of Fusarium moniliforme associated with rice Bakanae and its management
 
Creator Bal, Sushri Sangita
 
Contributor Behera, B
 
Subject Foot rot/Bakanae disease, paddy , Fusarium moniliforme (Sheldon)
 
Description Foot rot/Bakanae disease in paddy caused by Fusarium moniliforme (Sheldon),
Gibberella fujikuroi (Sawada) has been found to be destructive in different areas of Odisha.
The collected seed samples from varied sources revealed the association of above fungus both
externally and internally leading to disease severity in different cultivars grown in Odisha.
In the present study series of experiments were conducted in order to understand the
nature and extent of disease incidence, symptomatology, fungal morphology, physiology and
some biochemical attributes like gibberellic acid, ascorbic acid and indole acetic acid.
Molecular characterization of the pathogen and management of disease through botanicals,
bioagents and chemical means were also undertaken.
Three different isolates of the fungus were isolated and pure cultured and their
pathogenicity were proved. The detailed morphological and taxonomic characteristics of the
causal fungus were studied. The fungus grew profusely on Potato Dextrose Agar (PDA).
Glycine and maltose were to be most preferred source of nitrogen and carbon respectively for
highest biomass and sporulation. Molecular characterization revealed three different isolates
which were named as Fm-1, Fm-2 and Fm-3 and they were clustered in two groups as per
dendrogram. All the isolates produced gibberellin which caused plant elongation. Maximum
growth and sporulation of different isolates of F. moniliforme was found at 30°C and pH 5.5.
In vitro study revealed Benomyl (0.1%), Carbendazim (0.1%) and Benomyl 1g +
Thiram 2g/kg of seeds were effective fungicides for control of this fungus. Among plant
extracts Garlic at 20 per cent (w/v) concentration and among bioagents Trichoderma viride
was effective for inhibiting the growth of the fungus. Fungicidal seed treatment with Benomyl
1g + Thiram 2g/kg of seeds along with seedling root dip with Benomyl (0.1%) increased seed
germination, decreased foot rot incidence, plant height and substantial increase in grain yield.
 
Date 2017-01-03T14:24:57Z
2017-01-03T14:24:57Z
2015
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/94159
 
Language en
 
Relation Th;4470
 
Format application/pdf