Journal
LIFE-BASEL
Volume 11, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/life11121291
Keywords
small-spored; Alternaria; Solanaceae; taxonomy; diversity
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A survey in north-western regions of Algeria revealed diverse Alternaria isolates, with 8% unable to be classified. Through morphological and molecular analyses, the isolates were grouped into four categories, and their virulence on tomato plants was evaluated.
Although large-spored Alternaria species of the section Porri are considered to be the major agents responsible for leaf spot and blight of Solanaceae, small-spored Alternaria 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 Alternaria isolates from tomato, potato, pepper, eggplant and black nightshade, 8% could not be morphologically assigned to either section Porri or section Alternaria. In order to more precisely determine the taxonomic position of these isolates, detailed morphological characterizations and multi-locus phylogenetic analyses were performed. Based on these analyses, the isolates were grouped into four main clades: section Ulocladioides, section Infectoriae, including two new species, section Embellisioides, and section Eureka, including one new species. These isolates were also characterized for their virulence under green-house conditions. They were able to produce leaf spot symptoms on tomato plants but with variable levels.
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