Endophytic Diaporthe species from Brazil

Area of Science:

• Mycology
• Plant Pathology
• Biodiversity Studies

Background:

• Diaporthe species exhibit diverse lifestyles, acting as endophytes, pathogens, and saprobes across various hosts.
• Endophytic fungi play crucial roles in plant health and ecosystem dynamics, yet their diversity remains incompletely understood, particularly in tropical regions.

Purpose of the Study:

• To characterize endophytic Diaporthe species isolated from Miconia sp., Brosimum gaudichaudii, and Anacardium occidentale in Brazil.
• To introduce new Diaporthe species and clarify taxonomic relationships of known species using phylogenetic and morphological data.

Main Methods:

• Isolation and culturing of endophytic fungi from plant tissues.
• Multi-locus phylogenetic analyses using DNA sequences of β-tubulin (tub2), ITS, translation elongation factor 1-alpha (tef1), calmodulin (cmdA), and histone (his3).
• Morphological characterization of fungal isolates.

Main Results:

• Seven new Diaporthe species (D. azevedoi, D. catimbauensis, D. coracoralinae, D. luizorum, D. pedratalhadensis, D. samambaiaensis, and D. vargemgrandensis) were described.
• Seven known species were identified, and taxonomic clarifications were made, including synonymization of several species under D. inconspicua, D. raonikayaporum, and D. ueckeri.
• The study expanded the known geographic distribution and host range of Diaporthe species.

Conclusions:

• Endophytic fungal communities harbor significant undiscovered diversity, including novel Diaporthe species.
• Phylogenetic and morphological analyses are essential for accurate fungal species delimitation and understanding their ecological roles.
• This research contributes to the comprehensive understanding of Diaporthe diversity in Brazil and highlights the importance of exploring endophytic fungi.