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Arabidopsis thaliana subcellular responses to compatible Erysiphe cichoracearum infections
Author(s) -
Koh Serry,
André Aurélie,
Edwards Herb,
Ehrhardt David,
Somerville Shauna
Publication year - 2005
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/j.1365-313x.2005.02545.x
Subject(s) - haustorium , organelle , cytoplasm , microbiology and biotechnology , arabidopsis , vesicle , subcellular localization , biology , vacuole , green fluorescent protein , exocytosis , chemistry , membrane , biochemistry , gene , genetics , host (biology) , mutant
Summary Subcellular events of Erysiphe cichoracearum infections of epidermal cells were visualized in living tissues of Arabidopsis plants carrying various green fluorescent protein (GFP)‐tagged organelles via laser scanning confocal microscopy. Early in the infection sequence, cytoplasm and organelles moved towards penetration sites and accumulated near penetration pegs. Peroxisomes appeared to accumulate preferentially relative to the cytoplasm at penetration sites. Another early event, which preceded haustorium formation, was the aggregation of some GFP‐tagged plasma membrane marker proteins into rings around penetration sites, which extended across cell‐wall boundaries into neighboring cells. This feature localized to sites where papillae were deposited. The extrahaustorial membrane (EHM) encases the fungal feeding structure, the haustorium, separating it from the host cytoplasm. Eight plasma membrane markers were excluded from the EHM and remained in a collar‐like formation around the haustorial neck. These observations support the suggestions that the EHM is a unique, specialized membrane and is different from the plasma membrane. Our results suggested two possibilities for the origin of the EHM: invagination of the plasma membrane coupled with membrane differentiation; or de novo synthesis of the EHM by targeted vesicle trafficking.