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Host recognition by toxigenic plant pathogens

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Abstract

Certain fungal pathogens release host-selective (or host-specific) toxins (HST) as a host recognition factor during spore germination at the infection site on plants. Prior to penetration of the pathogen into its host, the released toxin specifically binds to a putative receptor on the host cells and initiates signaling mechanisms leading to pleiotropic effects on cells. Of these, the crucial one negates the general and inducible defense reactions of the cells. This is accomplished by a signal from the HSt, which is transduced through a path way at or near the step of plasma membrane modulation, which is directly or indirectly triggered by the HST. This mechanism operates even though the toxin may affect mitochondria or chloroplasts as the primary target organelle. The fungal spore is able to penetrate the so-called ‘narcotized cell’ and completes the initial colonization of the host. The host recognition process may take place without necessitating host cell death, even in the case of perthophytic parasites. At the molecular level, HST-mediated recognition of the host by a pathogen requires strict stereochemical precision like a lock and key.

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  1. Faculty of Agriculture, Tottori University, 680, Tottori, Japan

    K. Kohmoto & H. Otani

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Kohmoto, K., Otani, H. Host recognition by toxigenic plant pathogens. Experientia 47, 755–764 (1991). https://doi.org/10.1007/BF01922454

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