Eleven monoclonal antibodies specific to plum pox potyvirus (PPV) coat protein were obtained by hybridoma technology from Spanish PPV isolates. In addition, two monoclonal antibodies specific for PPV cylindrical inclusions (CIP non‐structural proteins) were obtained. The monoclonal antibodies specific for PPV coat protein were assayed by DASI ELISA against 81 PPV isolates. At least nine different epitopes were found and 21 distinct serological patterns of reaction (serogroups) were established using nine selected monoclonal antibodies against the collection of PPV isolates, indicating the high variability of coat protein among PPV isolates. Changes in epitope composition were observed after aphid and mechanical transmission, indicating the occurrence of mixtures of isolates in field trees. Monoclonal antibody 5B reacted with all PPV isolates assayed, with very high affinity, using DASI ELISA. This method was compared with immunocapture‐PCR on field samples in spring, and showed very good coincidence of results. The efficiency of PPV detection can be slightly increased using monoclonal antibodies specific to cylindrical inclusions mixed with monoclonal antibodies against structural proteins, and using mixtures of monoclonal antibodies against different epitopes of coat protein. ELISA‐I and immunoprinting‐ELISA were able to detect CIP and PPV in extracts and tissue section, respectively, of woody plants. Two monoclonal antibodies offer the possibility of distinguishing between Marcus and Dideron PPV types (M or D). These D‐specific monoclonal antibodies can be used in routine tests with high affinity.
EPPO Bulletin – Wiley
Published: Sep 1, 1994
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