Dialog between Kingdoms: Enemies, Allies and Peptide Phytohormones

Area of Science:

• Plant biology
• Molecular biology
• Evolutionary biology

Background:

• Plant peptide hormones regulate growth, development, and stress responses.
• Plant-interacting organisms manipulate host phytohormone signaling to establish infection or symbiosis.
• Phytohormone mimicry, particularly peptide hormone mimicry, is a key strategy employed by these organisms.

Purpose of the Study:

• To review known classes of peptide phytohormones produced by plant-interacting organisms from other kingdoms.
• To elucidate the mechanisms by which these effectors act on host plants.
• To discuss the potential evolutionary origins of these mimicry strategies.

Main Methods:

• Literature review of scientific publications.
• Analysis of genomic data for effector genes.
• Examination of experimental evidence for effector function and plant receptor interactions.

Main Results:

• Effectors mimicking seven classes of peptide phytohormones have been identified in bacteria, fungi, and nematodes.
• Some of these effectors interact with plant peptide hormone receptors, influencing plant development and defense.
• Evidence suggests these effectors are crucial for pathogen virulence and symbiont establishment.

Conclusions:

• Plant-interacting microbes have evolved sophisticated strategies to hijack plant hormonal pathways.
• Understanding these peptide hormone mimics provides insights into plant immunity and inter-kingdom communication.
• Further research into the evolution and function of these effectors can reveal novel targets for crop protection and improvement.