Evolution of reproductive morphology in leaf endophytes

Area of Science:

• Mycology
• Evolutionary Biology
• Fungal Classification

Background:

• The Leotiomycetes (Ascomycota) represent a challenging group for fungal classification.
• The endophytic lifestyle, where fungi live within plant tissues, is increasingly recognized for its evolutionary impact.

Purpose of the Study:

• To investigate the evolutionary role of the endophytic lifestyle on fungal reproductive morphology within the Leotiomycetes.
• To compare morphological divergence and ecological roles between endophytic and saprobic fungi in this group.

Main Methods:

• Morphological characteristics of fungal reproductive structures were mapped across different taxa within the Leotiomycetes.
• Ecological roles (endophytic vs. saprobic) were assigned to these fungal groups.
• Relationships between morphology and ecological niche were analyzed.

Main Results:

• Significant divergence in size, shape, and complexity of reproductive bodies was observed between Rhytismatales and Hemiphacidiaceae.
• Leaf-associated endophytes produce reduced fruiting bodies, often concealed by fungal or host tissues.
• Saprobic species, in contrast, develop larger, more complex fruiting bodies.

Conclusions:

• The endophytic lifestyle strongly influences the evolution of fungal reproductive morphology, favoring simplification.
• Morphological adaptations are closely linked to ecological niches in Leotiomycetes.
• Convergent evolution in developmental pathways may link sexual and asexual reproductive structures in some leotiomycetes.