Mechanism of the Alternaria alternata Pathogenicity in "Fortune' Mandarin

被引：4

作者：

Diaz, Licinio ^{[1
]}

Antonio Del Rio, Jose ^{[1
]}

Ortuno, Ana ^{[1
]}

机构：

[1] Univ Murcia, Fac Biol, Dept Biol Vegetal Fisiol Vegetal, Campus Espinardo, Murcia 30110, Spain

来源：

HORTICULTURAE | 2018年 / 4卷 / 04期

关键词：

alternariol; alternariol monomethyl ether; laccase; mycotoxins; HOST-SELECTIVE TOXINS; CITRUS-FRUITS; SUSCEPTIBILITY; LACCASE;

D O I：

10.3390/horticulturae4040054

中图分类号：

S6 [园艺];

学科分类号：

0902 ;

摘要：

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.

引用

页数：8

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