Molecular taxonomy of bambusicolous fungi: Tetraplosphaeriaceae, a new pleosporalean family with Tetraploa-like anamorphs

Summary

This research describes a new family of fungi that live on bamboo plants. The study used both traditional methods of examining fungal structures and modern DNA analysis to understand how these fungi are related to each other. The findings help organize our understanding of fungal diversity and evolution. Impacts on everyday life: • Helps understand the biodiversity of fungi living on bamboo, an economically important plant used by 2.5 billion people worldwide • Contributes to better classification systems for fungi, which is important for identifying potentially harmful or beneficial species • Improves our knowledge of plant-fungal relationships, which can affect bamboo cultivation and management • Provides baseline information for future studies on fungal evolution and adaptation • May lead to discoveries of new compounds or applications from these fungi

Background

Bamboo is an important plant group comprising 80-90 genera and 1000-1500 species worldwide. Over 1,100 fungal species have been described from bamboo, with around 300 known from bamboo in Japan. Many bambusicolous fungi have peculiar taxonomic features but their phylogenetic relationships based on molecular data are poorly understood.

Objective

To establish the taxonomic placement and phylogenetic relationships of bambusicolous fungi, particularly those with Tetraploa-like anamorphs, through morphological and molecular analyses. The study aimed to describe new taxa and evaluate their relationships within the Pleosporales order.

Results

A new family Tetraplosphaeriaceae was established to accommodate five new genera: Tetraplosphaeria, Triplosphaeria, Polyplosphaeria, Pseudotetraploa and Quadricrura. Fifteen new species were described within these genera. The family was found to be basal to the main pleosporalean clade. Molecular analyses revealed that Tetraplosphaeria with Tetraploa s. str. anamorphs represents an ancestral lineage within the family.

Conclusion

The study established Tetraplosphaeriaceae as a new family of bambusicolous fungi characterized by Massarina-like teleomorphs and Tetraploa-like anamorphs. Anamorphic features were found to be good indicators of phylogenetic relationships at family and genus levels. The research suggests that bambusicolous fungi tend to constitute independent clades deviating from existing families on other host plants, even when sharing morphological similarities.
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