Alternaria black rot, Alternaria leaf spot of rough lemon, and Alternaria brown spot of tangerines are three major citrus Alternaria pathogens. Citrus could be considered as a molecular contact point for host-selective toxin (HST)-mediated co-evolution of these Alternaria pathogens and susceptibility in the field. ACR-toxin is an HST produced by the rough lemon pathotype, and the target site of the toxin was identified as rough lemon mitochondria. The biosynthetic gene cluster for ACR-toxin production is on the 1.5 Mb-chromosome of the rough lemon pathotype. Another gene cluster for ACT-toxin production is located on the 1.9 Mb-chromosome of the tangerine pathotype. These TOX genes shown to have a role in ACR- or ACT-toxin biosynthesis by using gene disruption and silencing.
- Alternaria alternata
- Conditionally dispensable chromosome
- Host-selective toxin
ASJC Scopus subject areas
- Plant Science