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Serological Methods for Detection of Polymyxa graminis, an Obligate Root Parasite and Vector of Plant Viruses

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Relation http://oar.icrisat.org/1914/
http://dx.doi.org/10.1094/PHYTO.2000.90.5.537
 
Title Serological Methods for Detection of Polymyxa graminis, an Obligate Root Parasite and Vector of Plant Viruses
 
Creator Delfosse, P
Reddy, A S
Legreve, A
Devi, K T
Abdurahman, M D
Maraite, H
Reddy, D V R
 
Subject Sorghum
 
Description A purification procedure was developed to separate Polymyxa graminis resting spores from sorghum root materials. The spores were used as immunogen to produce a polyclonal antiserum. In a direct antigen coating enzyme-linked immunosorbent assay (DAC ELISA), the antiserum could detect one sporosorus per well of the ELISA plate. In spiked root samples, the procedure detected one sporosorus per mg of dried sorghum roots. The majority of isolates of P. graminis from Europe, North America, and India reacted strongly with the antiserum. Interestingly, P. graminis isolates from the state of Rajasthan (northern India), from Pakistan, and an
isolate from Senegal (West Africa) reacted weakly with the antiserum. The cross-reactivity of the serum with P. betae isolates from Belgium and Turkey was about 40% of that observed for the homologous isolate. There was no reaction with common fungi infecting roots or with the obligate parasite Olpidium brassicae. However, two isolates of Spongospora subterranea gave an absorbance similar to that observed with the homologous antigen. The DAC ELISA procedure was successfully used to detect various stages in the life cycle of P. graminis and to detect infection that occurred under natural and controlled environments. A simple procedure to conjugate antibodies to fluorescein 5-isothiocyanate (FITC) is described. Resting spores could be detected in root sections by using FITC-labeled antibodies. The potential for application of the two serological techniques for studying the epidemiology of peanut clump disease and for the characterization of Polymyxa isolates from various geographical origins is discussed.
 
Date 2000
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/1914/1/Phytopathology90_5_537-545_2000.pdf
Delfosse, P and Reddy, A S and Legreve, A and Devi, K T and Abdurahman, M D and Maraite, H and Reddy, D V R (2000) Serological Methods for Detection of Polymyxa graminis, an Obligate Root Parasite and Vector of Plant Viruses. Phytopathology, 90 (5). pp. 537-545.