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Trends Plant Sci. 2014 Nov;19(11):692-7. doi: 10.1016/j.tplants.2014.07.007. Epub 2014 Aug 23.

Autophagy as initiator or executioner of cell death.

Author information

1
Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, Box 7080, 75007 Uppsala, Sweden.
2
Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, Box 7080, 75007 Uppsala, Sweden. Electronic address: peter.bozhkov@slu.se.
3
Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, Box 7080, 75007 Uppsala, Sweden. Electronic address: daniel.hofius@slu.se.

Abstract

Autophagy plays multiple, often antagonistic roles in plants. In particular, cytoprotective functions of autophagy are well balanced by cell death functions to compensate for the absence of apoptosis culminating in phagocytic clearance of dead cells. If autophagy is indeed required for plant programmed cell death (PCD), then what place does it occupy in the PCD pathways? Recent studies have examined the effects of impaired autophagy on pathogen-induced hypersensitive response (HR) and developmental PCD. While HR death was efficiently suppressed, inhibition of autophagy induced a switch from vacuolar PCD essential for development to necrosis. We therefore propose a dual role for autophagy in plant PCD: as an effector of HR PCD lying upstream of the 'point-of-no-return', and also as a downstream mechanism for clearance of terminally differentiated cells during developmental PCD.

KEYWORDS:

autophagy; cell death; development; hypersensitive response

PMID:
25156061
DOI:
10.1016/j.tplants.2014.07.007
[Indexed for MEDLINE]

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