Schematic representation of the proposed role of PxECM33 in the fungal cell wall. (IMAGE)
Caption
Schematic representation of the proposed role of PxECM33 in the fungal cell wall. (A) When PxECM33 is present, the outer and inner layers of the fungal cell wall remain closely interconnected, restricting plant hydrolases (such as chitinases and β-glucanases) from accessing structural wall components. This limited enzymatic access reduces the release of immunogenic oligomers. (B) In contrast, absence of PxECM33 leads to detachment of the outer wall layer, composed primarily of mannoproteins, from the inner wall. This separation permits plant hydrolases to degrade chitin and β-glucan polysaccharides, resulting in the release of oligomers that are perceived via the CmCERK1 coreceptor, thereby triggering PAMP-triggered immunity (PTI). For clarity, only major components of the fungal cell wall are illustrated.
Credit
Horticulture Research
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