Haplotype diversity and phylogeny within Alternaria alternata and A. arborescens species complexes from tomatoes.

Tomato (Solanum lycopersicum L.) is an economically important vegetable susceptible to various fungal diseases, including leaf spot caused by Alternaria spp. from the section Alternaria.

Xanthone Inhibitors of Unfolded Protein Response Isolated from .

The unfolded protein response (UPR) is a key component of fungal virulence. The prenylated xanthone γ-mangostin isolated from (Clusiaceae) fruit pericarp, has recently been described to inhibit this fungal adaptative pathway. Considering that (Calophyllaceae) is known for its high prenylated xanthone content, its stem bark extract was fractionated using a bioassay-guided procedure based on the cell-based anti-UPR assay.

Natural Products Targeting the Fungal Unfolded Protein Response as an Alternative Crop Protection Strategy.

Discovering new solutions for crop protection is a major challenge for the next decades as a result of the ecotoxicological impact of classical fungicides, the emergence of fungicide resistances, and the consequence of climate change on pathogen distribution. Previous work on fungal mutants deficient in the unfolded protein response (UPR) supported that targeting this pathway is a promising plant disease control strategy. In particular, we showed that the UPR is involved in fungal virulence by altering cell protection against host defense compounds, such as phytoalexins and phytoanticipins.

In silico analysis of RNA interference components and miRNAs-like RNAs in the seed-borne necrotrophic fungus Alternariabrassicicola.

RNA interference is a mechanism of suppressing gene expression in plants, animals and fungi. This regulation mechanism involves three main enzymes, Dicers (Dcr), Argonautes (Ago) and RNA Dependent RNA Polymerases (Rdrp) allowing to produce smallRNAs. RNA interference and smallRNAs have a role in the plant-microorganisms interaction, either in a pathogenic or in a symbiotic relationships.

Characterization of New Small-Spored Species Isolated from in Algeria.

Although large-spored species of the section are considered to be the major agents responsible for leaf spot and blight of , small-spored species are also frequently isolated from symptomatic tissues. A survey of the north-western regions of Algeria during the 2017-2018 growing seasons revealed that amongst the 623 isolates from tomato, potato, pepper, eggplant and black nightshade, 8% could not be morphologically assigned to either section or section . In order to more precisely determine the taxonomic position of these isolates, detailed morphological characterizations and multi-locus phylogenetic analyses were performed.