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Development of a charcoal rot rating index for multilocation trials of sorghum

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Title Development of a charcoal rot rating index for multilocation trials of sorghum
Not Available
 
Creator IK Das
S Rakshit
KK Sharma
SN Chattannavar
VM Gholve
SK Jayalaksmi
VA Tonapi
 
Subject Rabi, Sorghum, Charcoal rot, disease rating scale
 
Description Not Available
Comparing the performance of sorghum genotypes for charcoal rot resistance in a multilocation trial becomes
difficult due to non-uniform disease reactions over locations obtained by applying mean number of nodes cross
(MNC) scale. This study analyzed the relationship between disease incidence and severity and developed a
disease rating index for use in the multilocation trial. The incidence-severity relationship for the disease was
studied based on multilocation and multiyear data sets obtained from the all India coordinated research programme on sorghum. The incidence, severity and relationship between them varied depending on the crop
growing environments (year, locations) suggesting that it would be inappropriate to consider incidence in place
of severity and vice versa for the measurement of the disease. The reasons for the inconsistent I-S relationship
were attributed to the environmental and pathogenic variations across the locations and years. Five charcoal rot rating indices (CRI 1 to CRI 5) were developed combining incidence and severity in different proportions to
average out these effects. Suitability of the indices for comparing the performance of sorghum genotypes in the
multilocation trials was tested using genotype + genotype-environment (GGE) biplot analysis. CRI 2 that
combined incidence and severity in the 40:60 proportions was found to be the most stable index in terms of
performance across the locations. CRI 2 rated the charcoal rot reactions of the sorghum genotypes with greater
accuracy and reliability (R2=0.341, p=0.001) compared to the existing MNC scale (R2=0.001, p=0.965) in
replicated field trials. The index (CRI 2) will help identify disease reactions among sorghum genotypes with
greater consistency in multilocation trials.
Not Available
 
Date 2024-07-29T12:49:18Z
2024-07-29T12:49:18Z
2018-02-17
 
Type Research Paper
 
Identifier Not Available
261-2194
http://krishi.icar.gov.in/jspui/handle/123456789/83952
 
Language English
 
Relation Not Available;
 
Publisher Not Available