The second Phytophthora mating hormone defines interspecies biosynthetic crosstalk

Area of Science:

• Agricultural Science
• Biochemistry
• Organic Chemistry

Background:

• The agricultural pest Phytophthora relies on mating hormones alpha1 and alpha2 for sexual reproduction.
• Understanding these hormones is crucial for managing Phytophthora outbreaks.

Purpose of the Study:

• To determine the absolute stereostructure of the Phytophthora mating hormone alpha2.
• To elucidate the biosynthetic and metabolic pathways of alpha hormones in Phytophthora.

Main Methods:

• Spectroscopic analysis was employed to define the stereochemistry of alpha2.
• Total synthesis was performed to confirm the structure of alpha2.
• Investigated the biosynthesis of alpha2 from phytol and its conversion to alpha1.

Main Results:

• The absolute stereostructure of the mating hormone alpha2 was successfully determined.
• Demonstrated the interspecies universality of alpha hormones in Phytophthora.
• Identified the pathway for alpha2 biosynthesis from phytol by A2-mating type strains.
• Revealed the metabolic conversion of alpha2 to alpha1 by A1 strains.

Conclusions:

• The structural elucidation and synthetic confirmation of alpha2 provide a foundation for understanding Phytophthora mating.
• The identified biosynthetic and metabolic pathways highlight the hormonal regulation of sexual reproduction in Phytophthora.
• Knowledge of these hormone pathways can inform novel strategies for controlling this significant agricultural pest.