Host range of tropical and Sub-tropical isolates of polymyxa graminis

Legreve, A and Vanpee, B and Delfosse, P and Maraite, H (2000) Host range of tropical and Sub-tropical isolates of polymyxa graminis. European Journal of Plant Pathology, 106 (4). pp. 379-389. ISSN 0929-1873

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The host range of Polymyxa graminis isolates originating from peanut clump-infested areas in India (Andhra Pradesh and Rajasthan), Pakistan and Senegal was studied on monocotyledonous and dicotyledonous cultivated species, using known quantities of sporosori as inoculum. Profuse multiplication occurred only on some graminaceous species, but the various isolates showed different host specificity. All the isolates produced high infection on sorghum and pearl millet, and all but one isolate from Rajasthan infected maize. Wheat, rye and barley were susceptible to some of the tested isolates. The isolates from Rajasthan and Pakistan produced moderate to severe infection on at least one of these species. On rice, groundnut and sugar beet, only traces of infection by some isolates were detected, whereas no infection was observed on mustard and sunflower. Differences of susceptibility in Pennisetum spp. and Sorghum spp. were demonstrated. The variations in host specificity among isolates from peanut clump-infested areas may result from an adaptation of P. graminis populations to various biotopes. The implications of these results for the management of peanut clump disease are discussed. A comparison of the host ranges of isolates of P. graminis and P. betae from temperate areas demonstrated that distinct types of Polymyxa might be identified based on their relative ability to multiply on susceptible species. Nevertheless, overlapping in the host ranges among the different Polymyxa types, characterised by distinct ecological and genomic features, raises doubts about the host range as a classification criterion for the Polymyxa genus

Item Type: Article
Uncontrolled Keywords: cereals; Pennisetum spp.; Plasmodiophoromycetes; Polymyxa betae; Sorghum spp
Subjects: Mandate crops > Sorghum
Depositing User: Ms K Syamalamba
Date Deposited: 17 Jan 2013 05:42
Last Modified: 07 Feb 2014 05:41
Official URL:
Acknowledgement: UNSPECIFIED
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