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Serological Grouping of Cowpea Severe Mosaic Virus Isolates from Central Brazil. M. T. Lin, Associate professor, Department of Plant Biology, University of Brasilia, 70910 Brasilia, DF, Brazil; J. R. N. Anjos(2), and G. P. Rios(3). (2)Graduate student, Department of Plant Biology, University of Brasilia, 70910 Brasilia, DF, Brazil; (3)Plant pathologist, National Research Center for Rice and Bean (CNPAF), EMBRAPA, 74000 Goi‚nia, Goias, Brazil. Phytopathology 71:435-438. Accepted for publication 17 September 1980. Copyright 1981 The American Phytopathological Society. DOI: 10.1094/Phyto-71-435.

Fourteen single-lesion isolates of cowpea severe mosaic virus obtained from central Brazil were separated by immunodiffusion in agar gel into two serologically distinct groups, designated as serotype I (13 isolates) and serotype II (one isolate), respectively. Isolates of serotype I infected soybean (Glycine max) cultivar IAC-2 which was immune to serotype II. This soybean cultivar is suggested as a possible diagnostic plant for this virus. Based on reactions in cowpea (Vigna unguiculata) cultivar IPEAN VII, bean (Phaseolus vulgaris) cultivar Rico 23, and Chenopodium amaranticolor, the isolates in serotype I were further classified into three groups. C. amaranticolor, which was previously regarded as only a local lesion host for cowpea severe mosaic virus, was shown to be systemically infected by some isolates of serotype I. Serotype I also was shown to be serologically more related than serotype II to two other legume comoviruses, cowpea mosiac virus and bean pod mottle viruses.

Additional keywords: antiserum production, cross-absorption test.