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Etiology

Indian Peanut Clump Virus Isolates: Host Range, Symptomatology, Serological Relationships, and Some Physical Properties. B. L. Nolt, Groundnut Improvement Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, 502324, A.P., India, Present address: Cassava Program, CIAT, Apartado Aereo 6713, Cali, Colombia; R. Rajeshwari, D. V. R. Reddy, N. Bharathan, and S. K. Manohar. Groundnut Improvement Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, 502324, A.P., India. Phytopathology 78:310-313. Accepted for publication 9 December 1986. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/Phyto-78-310.

The symptomatology of Indian peanut clump virus (IPCV) isolates collected from five different geographical locations, Bapatla (B), Chinnaganjam (C), Hyderabad (H), Ludhiana (L), and Talod (T), differed. B-IPCV and C-IPCV were indistinguishable by host range but could be distinguished from the other isolates by symptoms on Canavalia ensiformis, Nicotiana clevelandii × glutinosa, Phaseolus vulgaris, and Vigna unguiculata. B-IPCV, C-IPCV, and T-IPCV were related serologically, but could be distinguished from H-IPCV and L-IPCV isolates in serological tests. The five isolates could not be distinguished on the basis of particle size. Each isolate contained two RNA species of 1.90 × 10⁶ and 1.65 × 10⁶ M_r estimated under nondenaturing conditions and a single polypeptide of 24 × 10³ M_r. Significance of these findings for the diagnosis of IPCV and for screening of peanut genotypes for resistance is discussed.