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Horticulturae 2018, 4(4), 54; https://doi.org/10.3390/horticulturae4040054

Mechanism of the Alternaria alternata Pathogenicity in ‘Fortune’ Mandarin

Departamento de Biología Vegetal (Fisiología Vegetal), Facultad de Biología, Universidad de Murcia, Campus de Espinardo, 30110 Murcia, Spain
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Received: 23 October 2018 / Revised: 27 November 2018 / Accepted: 5 December 2018 / Published: 7 December 2018
(This article belongs to the Special Issue Horticultural Plant Pathology and Prevention)
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Abstract

Alternaria brown spot, caused by Alternaria alternata (Fr.) Keissl, is an important disease in tangerines and their hybrids, affecting leaves, twigs, and immature fruit. Differences in susceptibility to this pathogenic fungus have been described for different Citrus species. In this paper, the expression of the mycotoxins alternariol and alternariol monomethyl ether in different A. alternata isolates was analyzed by HPLC-MS. A correlation was observed between the mycotoxins content and the pathogenicity of each isolated of A. alternata used, suggesting that the mycotoxins may be involved in the evolution of brown spot in ‘Fortune’ fruits caused by this fungus. The increased expression of the above mycotoxins was associated with the end of mycelia growth, high sporulation, and an increase in hyphal melanization in the fungus. On the other hand, the presence of laccase activity in the xylem of ‘Fortune’ fruits inoculated with A. alternata suggests that this is the way the fungus propagates in the plant. These results add to our knowledge of the pathogenesis of A. alternata in Citrus. View Full-Text
Keywords: alternariol; alternariol monomethyl ether; laccase; mycotoxins alternariol; alternariol monomethyl ether; laccase; mycotoxins
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Díaz, L.; Del Río, J.A.; Ortuño, A. Mechanism of the Alternaria alternata Pathogenicity in ‘Fortune’ Mandarin. Horticulturae 2018, 4, 54.

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