Electron microscopy of susceptible and resistant near-isogenic (sr6/Sr6) lines of wheat infected by Puccinia graminis tritici. I. The host–pathogen interface in the compatible (sr6/P6) interaction

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Abstract
Membrane associations in the interfacial zone between host cytoplasm and haustoria of wheat stem rust are reported. The invaginated host plasmalemma (IPL) adhered tightly to the haustorial neck wall above an indistinct zone at the base of the neck. There was extensive proliferation of host endoplasmic reticulum (ER) near haustoria during the formative growth stages of the haustoria. Most of the proliferation occurred along the neck from the neck ring region to the area at the base of the haustorial body where the extrahaustorial sheath became evident. Closely spaced arrays of ER occurred along the neck and radiated into the host cytoplasm. The ER was closely associated with the IPL in the vicinity of the neck wall, and at points of contact or near contact, the ER was ribosome free and stained more densely. There was luminal continuity between ER cisternae and the extrahaustorial sheath matrix. In the host cytoplasm adjacent to haustoria, ER-derived membranous complexes were found. These complexes consisted of a lattice arrangement of large tubules and small tubules, the latter containing a thread of denser staining material at their centers. The large tubules were bounded by lightly stained membranes, whereas the membranes of the small tubules stained more densely. These complexes were interconnected by rough ER to form networks in host cytoplasm. The complexes formed part of the interface between host and pathogen through connections with the invaginated host plasmalemma.

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