Abstract
The phytopathogenic fungus Alternaria alternata has a wide host range. However, certain pathotypes are selectively virulent and cause brown spots on leaves and fruits of specific species or cultivars of Citrus, whereas they are relatively harmless to others owing to the production of host-specific toxins. The so-called ACR toxin of the rough lemon pathotype (RLP) causes citrus brown spot disease exclusively on rough lemon. Physiological and ultrastructural data had previously suggested that mitochondria were the site of action of the ACR toxin. Kouhei Ohtani and colleagues [ 1. Ohtani K et al. Sensitivity to Alternaria alternata toxin in citrus because of altered mitochondrial RNA processing. Proc. Natl. Acad. Sci. U. S.A. 2002; 99: 2439-2444 Crossref PubMed Scopus (52) Google Scholar ] have now provided a surprising explanation for the selectivity: the RNA of a mitochondrial gene (ACRS for ACR-toxin sensitivity) is specifically processed to yield a susceptible interaction with the ACR toxin.
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