[Seminars] PSB event reminder

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Calendar Name: seminars
Scheduled for: Friday, October 18 2013, 14:00 - 15:30
Event text:    Prof Ildoo Hwang
	       
	       Department of Life Sciences
	       POSTECH Biotech Center
	       Pohang University of Science and Technology 
	       
	       Pohang 
	       KOREA
Details:       “The action of cytokinin, a phytohormone, in plant
	       immunity”
	       
	       ABSTRACT
	       Cytokinins affect plant immunity to various pathogens;
	       however, the mechanisms coupling plant-derived
	       cytokinins to pathogen responses have been elusive. We
	       recently revealed that plant-derived cytokinins promote
	       resistance of a model plant Arabidopsis to a bacterial
	       pathogen Pseudomonas syringae. Modulated cytokinin
	       levels or signaling activity correlate with altered
	       resistance. Cytokinin directly modulates the expression
	       of salicylic acid (a defense-related plant hormone) or
	       defense-related genes via cytokinin-activated
	       transcription factors called type-B ARRs, which interact
	       with the salicylic acid response factor TGA3 and
	       contribute to resistance against the pathogen by
	       potentiating salicylic acid signaling. Other than SA
	       signaling, cytokinin affects an elicitor
	       flagellin-induced stomata closure and FRK1 induction,
	       implying its role for pre-invasive defense mediated via
	       PAMP recognition. Interestingly, cytokinin also confers
	       a priming effect, which induces a rapid and strong
	       defense response.  Taken together, our results indicate
	       that cytokinins modulate multitude of defense signaling
	       to augment resistance against a bacterial pathogen. I
	       will further discuss how plant modulates a priming
	       defense response, especially the transcriptional
	       competence of defense-related genes.

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