Membrane Proteome of Phytophthora parasitica Zoospores: How Does Sensing Occur?

Biflagellated zoospores enable plant pathogens of the Phytophthora genus to locate a host. While rhizospheric signals guiding zoospore movement toward roots are known, their membrane protein composition mediating these responses remains unclear. Here, we use LC-MS/MS to analyze membrane fractions from the flagella and cell bodies of Phytophthora parasitica zoospores, identifying major membrane protein classes and quantifying their subcellular distribution. These findings advance our understanding of protein-mediated dispersal and host targeting in zoospores andsupport the hypothesis that zoospores utilize polarized signal perception mechanisms for environmental sensing and movement.