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Diversity and Function of Appressoria.

K W Thilini Chethana1,2,3, Ruvishika S Jayawardena2,3, Yi-Jyun Chen2,3

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Fungi use specialized structures called appressoria to infect plants. This review classifies appressoria diversity, formation, and function, exploring molecular mechanisms and host defense evasion strategies.

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Area of Science:

  • Mycology
  • Plant Pathology
  • Molecular Biology

Background:

  • Fungi exhibit diverse interactions with plants, including endophytic, saprobic, and pathogenic lifestyles.
  • Successful plant colonization by fungi hinges on effective attachment and penetration of the plant surface.
  • Appressoria are specialized fungal structures crucial for breaching plant barriers.

Purpose of the Study:

  • To review the diversity and classification of fungal appressoria.
  • To discuss the ultrastructure, initiation, formation, and function of appressoria.
  • To explore the molecular mechanisms, host defense evasion strategies, and genomic/transcriptomic data related to appressoria.

Main Methods:

  • Literature review and synthesis of existing research on fungal appressoria.
  • Classification of appressoria into single-celled and compound types.
  • Discussion of ultrastructural, molecular, and genomic aspects.

Main Results:

  • Appressoria are classified into single-celled (proto-appressoria, hyaline, melanized) and compound forms.
  • Detailed discussion on appressoria ultrastructure, formation triggers, and functional roles in nutrient acquisition.
  • Overview of molecular pathways regulating appressoria development and function, including host-pathogen interactions.

Conclusions:

  • Appressoria represent a key adaptation for fungal plant pathogens and symbionts.
  • Understanding appressoria is vital for deciphering fungal evolution and plant-fungi interactions.
  • This review provides a framework for future research into appressoria diversity and function.