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Intra-population Variability in Colletotrichum sublineoium Infecting Sorghum

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Title Intra-population Variability in Colletotrichum sublineoium Infecting Sorghum
 
Creator Mathur, K
Rao, V P
Thakur, R P
 
Subject Sorghum
 
Description Twelve monoconidial isolates were derived from a single-spore culture of Colletotrichum sublineoium isolate Cs 048 obtained from a local sorghum cultivar at Kovilpatti (India). The 12 isolates were evaluated for colony characteristics, spore morphology, and pathogenicity on six sorghum genotypes in the greenhouse. The isolates differed significantly in colony growth and morphology, and spore size within themselves and compared with the parental isolate. Variation in colony growth ranged from 0.1 % (Cs 048-7b-1) to 66.6% (Cs 048-1-2) relative to the parental isolate. Two of the 12 isolates showed distinct sectorial mycelial growth. Pathogenicity studies showed significant differences (P < 0.001) between isolates for latent period, virulence, aggressiveness, and virulence index. Isolate Cs 043-2 was most virulent infecting all six sorghum lines. Five other isolates were equally virulent infecting only two sorghum lines each. The parental isolate infected five sorghum lines. Cs 048-2 was the most aggressive isolate, while the parental isolate was moderately aggressive compared to the other isolates. The most virulent and aggressive isolates generally had the highest virulence index (virulence x aggressiveness x latent period-1). The results indicated the inherent genetic variability between monoconidial isolates of C. sublineoium,
 
Publisher Indian Society of Mycology and Plant Pathology
 
Date 1997
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/4920/1/LoginAction.pdf
Mathur, K and Rao, V P and Thakur, R P (1997) Intra-population Variability in Colletotrichum sublineoium Infecting Sorghum. Indian Journal of Mycology & Plant Pathology, 27 (3). pp. 302-310. ISSN 0303-4097