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Biochemical Factors Governing Interactions in Rice Genotypes Against Pyricularia grisea (Cooke) Sacc.

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Title Biochemical Factors Governing Interactions in Rice Genotypes Against Pyricularia grisea (Cooke) Sacc.
 
Creator Sowmya H.M.
 
Contributor S.K. Prashanthi
 
Subject Plant pathology
 
Description Rice blast caused by Pyricularia grisea (Cooke) Sacc. continues to be a
serious constraint to rice production in both tropical and temperate regions. Roving
survey carried out during kharif 2010 in Karnataka showed that blast severity ranged
from 20.17 to 58.72 per cent disease index. Field screening of 210 genotypes against
blast showed that, seven genotypes viz., Casebatta, Jasmine -85, Siddasala, IR-64,
Diamond Sona, Vajram, MGD 101 were resistant to both leaf and neck blast. Fifty
five genotypes were resistant and eighty five genotypes were moderately resistant to
leaf blast.
Influence of blast on different biochemical components present in resistant,
moderately resistant and susceptible genotypes at different stages of blast infection
was investigated.
Total phenol, Orthodihydroxy-phenol, total sugar, reducing sugar and non
reducing sugar content was more in resistant and moderately resistant varieties
compared to susceptible genotypes at all the stages of infection but they decreased
slightly during neck blast stage. Accumulation and increase of phenol content in
resistant genotypes was quick and more compared to moderately resistant and
susceptible genotypes. Total amino acid content was more in resistant genotypes
compared to susceptible genotypes. Total amino acid content increased from before
disease initiation stage to neck blast stage. Protein content was more in susceptible
genotypes compared to resistant and moderately resistant varieties and it decreased
from before initiation stage to neck blast stage rapidly. Decrease of protein content
from before disease initiation stage to peak stage was maximum in resistant varieties
than moderately resistant and susceptible varieties.
Isozyme study on peroxidase activity indicated significant variations among
resistant, moderately resistant and susceptible genotypes. Phenylalanine ammonia
lyase activity was more in resistant genotypes compared to moderately resistant and
susceptible genotypes.
 
Date 2016-11-11T17:06:21Z
2016-11-11T17:06:21Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/85192
 
Format application/pdf
 
Publisher UAS, Dharwad