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Monoclonal antibodies which show restricted binding to four Colletotrichum species: Colletotrichum lindemuthianum, Colletotrichum malvarum, Colletotrichum orbiculare and Colletotrichum trifolii


Monoclonal antibodies which show restricted binding to four Colletotrichum species: Colletotrichum lindemuthianum, Colletotrichum malvarum, Colletotrichum orbiculare and Colletotrichum trifolii



Physiological and Molecular Plant Pathology 41(2): 111-126



ISSN/ISBN: 0885-5765

Monoclonal antibodies (MAbs) were raised to Colloetotrichum lindemuthianum race gamma germlings. When screened against eleven other Colletotrichum species using an ELISA, two of these MAbs, UB20 and UB22, showed restricted cross-reaction with three other species, viz. C. malvarum, C. orbiculare and C. trifolii. It was also observed that UB20 and UB22 bound only to isolates of C. lindemuthianum from bean and not cowpea. These findings suggest that the four Colletotrichum species recognized by the two MAbs are very closely related, confirming previous evidence. The MAbs did not bind to species of Fusarium or Phoma. UB20 and UB22 bound to carbohydrate epitopes on two distinct sets of glycoproteins. The glycoproteins recognized by the two MAbs were present on the surface of different infection structures in varying amounts: UB20 antigens were predominantly located on conidia, whereas UB22 antigens appeared to be most abundant in fibrillar material around germ-tubes. Both MAbs labelled the wall and matrix around intracellular infection hyphae. Potential applications of the MAbs for the identification of the above pathogens are discussed.

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Accession: 009914701

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