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Virulence Diversity in North Indian Isolates of Sclerospora Graminicola, the pearl millet Downy Mildew Pathogen

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Title Virulence Diversity in North Indian Isolates
of Sclerospora Graminicola, the pearl millet
Downy Mildew Pathogen
 
Creator Sharma, R
Rao, V P
Senthilvel, S
Rajput, S C
Thakur, R P
 
Subject Millets
 
Description On-farm surveys were conducted in the Uttar Pradesh
(India) during the two rainy seasons 2007 and 2008 to
monitor pearl millet (Pennisetum glaucum) downy mildew
incidence. Twenty-one isolates of Sclerospora graminicola,
the pearl millet downy mildew pathogen, were collected
from different hybrid cultivars. These isolates were established
on seedlings of the highly susceptible line 7042S
grown in the greenhouse and were characterized for their
virulence diversity using a set of seven host differential
lines. Quantitative differences in virulence among
pathogen isolates were determined by calculating virulence
index (percent disease incidence × latent period-1).
Results were submitted to cluster analysis using the Average
Linkage method to determine similarity among
pathogen isolates. The two highly virulent isolates, Sg 492
from Aligarh and Sg 510 from Badaun, representing geographically
diverse locations were selected for use in
greenhouse screening of pearl millet breeding lines.
 
Date 2011
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/54/1/008_JPP322%28Sharma%29_71.pdf
Sharma, R and Rao, V P and Senthilvel, S and Rajput, S C and Thakur, R P (2011) Virulence Diversity in North Indian Isolates of Sclerospora Graminicola, the pearl millet Downy Mildew Pathogen. Journal of Plant Pathology, 93 (1). pp. 71-78.