Intra-population Variability in Colletotrichum sublineoium Infecting Sorghum

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

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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,

Item Type: Article
Subjects: Mandate crops > Sorghum
Depositing User: Library ICRISAT
Date Deposited: 12 Dec 2011 13:02
Last Modified: 12 Dec 2011 13:02
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Acknowledgement: The senior author thanks ICRISAT Asia Center for providing the opportunity and the Vice Chancellor Rajasthan Agricultural University for granting permission to undertake this collaborative research at IAC.
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