Summary
Zea mays is a non-host ofPhytophthora cinnamomi; plants survive contact with this fungus both in the field and in pot trials. TheZ. mays-P. cinnamomi interaction has been studied by light and electron microscopy. In the epidermal layer, fungal hyphae grow intercellularly through the middle lamella. This is always the case for the first hyphal contact with any cell. Hyphae making second or subsequent contacts with a cell grow preferentially between the cell wall and plasma membrane of the infected cell rather than through the middle lamella.
Papillae (callose deposits) are formed in response to some, but not all, regions of contact between the plant cell and the hypha. They do not completely encase the hypha and do not stop hyphal growth. The plasma membrane-cell wall interface of the host cell must be intact for effective papilla formation, as papillae are rarely formed when the hyphae grow between the plasma membrane and the cell wall.
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Hinch, J.M., Wetherbee, R., Mallett, J.E. et al. Response ofZea mays roots to infection withPhytophthora cinnamomi . Protoplasma 126, 178–187 (1985). https://doi.org/10.1007/BF01281793
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DOI: https://doi.org/10.1007/BF01281793