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Front Plant Sci

Title:		Damaged-self recognition in common bean (Phaseolus vulgaris) shows taxonomic specificity and triggers signaling via reactive oxygen species (ROS)
Author(s):		Duran-Flores D; Heil M;
Address:		"Laboratory of Plant Ecology, Departamento de Ingenieria Genetica, Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional Unidad Irapuato Irapuato, Mexico"
Journal Title:		Front Plant Sci
Year:		2014
Volume:		20141031
Issue:
Page Number:		585 -
DOI:		10.3389/fpls.2014.00585
ISSN/ISBN:		1664-462X (Print) 1664-462X (Electronic) 1664-462X (Linking)
Abstract:		"Plants require reliable mechanisms to detect injury. Danger signals or 'damage-associated molecular patterns' (DAMPs) are released from stressed host cells and allow injury detection independently of enemy-derived molecules. We studied the response of common bean (Phaseolus vulgaris) to the application of leaf homogenate as a source of DAMPs and measured the production of reactive oxygen species (ROS) as an early response and the secretion of extrafloral nectar (EFN) as a jasmonic acid (JA)-dependent late response. We observed a strong taxonomic signal in the response to different leaf homogenates. ROS formation and EFN secretion were highly correlated and responded most strongly to leaf homogenates produced using the same cultivar or closely related accessions, less to a distantly related cultivar of common bean or each of the two congeneric species, P. lunatus and P. coccineus, and not at all to homogenates prepared from species in different genera, not even when using other Fabaceae. Interestingly, leaf homogenates also reduced the infection by the bacterial pathogen, Pseudomonas syringae, when they were applied directly before challenging, although the same homogenates exhibited no direct in vitro inhibitory effect in the bacterium. We conclude that ROS signaling is associated to the induction of EFN secretion and that the specific blend of DAMPs that are released from damaged cells allows the plant to distinguish the 'damaged-self' from the damaged 'non-self.' The very early responses of plants to DAMPs can trigger resistance to both, herbivores and pathogens, which should be adaptive because injury facilitates infection, independently of its causal reason"
Keywords:		Pseudomonas syringae damage-associated molecular pattern danger signal extrafloral nectar induced defense induced resistance plant pathogen wound response;
Notes:		"PubMed-not-MEDLINEDuran-Flores, Dalia Heil, Martin eng Switzerland 2014/11/18 Front Plant Sci. 2014 Oct 31; 5:585. doi: 10.3389/fpls.2014.00585. eCollection 2014"