Espécies de THIELAVIOPSIS em palmeiras selvagens e cultivada
Date
2022-08-30Author
http://lattes.cnpq.br/0820690430592570
ROCHA, Fabiane Valéria Rêgo da
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Show full item recordAbstract
In order to contribute to the knowledge of phytopathogenic fungi that are associated
with wild and cultivated palm trees that host these organisms, it is worth highlighting
species or phylogenetic lineages of fungi belonging to the Ceratocystiaceae family,
where they cause diseases in palm trees. The fungi that induce fruit rot and resinosis
in palm trees comprise the species of the Thielaviopsis paradoxa complex. This
research aims to elucidate which Thielaviopsis species are associated with native
palm species and if these species are pathogenic in cultivated species. Two chapters
resulted from this research. In chapter I, samples of fruits from native palm trees with
symptoms of rot were collected in the states of Pará and Piauí. Thielaviopsis isolates
obtained from four distinct species of Arecaceae were characterized using the
concept of morphological and phylogenetic species. From the analysis, the isolates
were identified as Thielaviopsis ethacetica and Thielaviopsis cerberus. All isolates
induced symptoms of black rot in Cocos nucifera, Ananas comosus, and Saccharum
oficcinarum stalks. In chapter II, peach palm fruits showing symptoms of black rot
were collected in markets and in an experimental area in the cities of the states of
Pará and Acre, Brazil, in the years 2018-2019. The fruits showed symptoms of black
rot with the formation of black mycelium on the fruits. Microscopic analysis revealed
the presence of typical conidia of the genus Thielaviopsis sp. With monosporic
cultures were obtained and nine isolated. Based on phylogenetic analysis of the ITS
and TEF-1 α gene regions, the fungi were identified as Thielaviopsis ethacetica. All
isolates induced symptoms of black rot in peach palm fruits of the yellow and red
varieties. This is the first record of T. ethacetica causing black rot in peach palm fruits
in Brazil.