Recognitional specificity and evolution in the tomato-Cladosporium fulvum pathosystem.

Area of Science:

• Plant-pathogen interactions
• Molecular plant pathology
• Plant immunity

Background:

• Plant biotrophic and hemibiotrophic pathogen interactions involve host receptors and pathogen effectors.
• Pathogen effectors suppress host defenses and manipulate metabolism, while host receptors activate defense mechanisms upon recognition.
• The tomato-Cladosporium fulvum pathosystem exemplifies this interaction, with Cf genes in tomato encoding resistance receptors and C. fulvum secreting Avr effector proteins.

Purpose of the Study:

• To review the current understanding of recognitional specificity in the tomato-C. fulvum pathosystem.
• To elucidate the molecular mechanisms by which tomato Cf proteins perceive C. fulvum effector proteins.
• To discuss the evolutionary causes and consequences of this specificity.

Main Methods:

• Review of existing literature on Cf and Avr gene isolation and characterization.
• Analysis of molecular interplay between tomato Cf proteins and C. fulvum effector proteins.
• Focus on studies detailing effector perception mechanisms (direct binding, complex formation, modification of host proteins).

Main Results:

• Details of molecular interplay between tomato Cf proteins and C. fulvum effectors are emerging.
• Pathogen effectors have diverse roles, including binding/modifying host proteins or passive masking.
• Effector perception by Cf proteins occurs through specific mechanisms, including direct binding or via host protein complexes/modifications.

Conclusions:

• Recognitional specificity is a critical aspect of the tomato-C. fulvum interaction.
• Understanding these specific molecular interactions is key to deciphering plant immune responses.
• Further research is needed to address remaining questions regarding effector perception and the evolution of specificity.