[Seminars] PSB event reminder

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Calendar Name: seminars
Scheduled for: Thursday, June 24 2010, 11:00 - 12:30
Event text:    Prof Stanislaw Karpinski
	       
	       Warsaw University of Life Sciences
	       Faculty of Horticulture and Landscape Architecture
	       Dept. of Genetics, Breading and Plant Biotechnology
	       
	       Warsaw
	       POLAND
Details:       "Can Plants think? Light Memory, Photo-Electric
	       Signaling and Arabidopsis from Avatar"
	       
	       ABSTRACT
	       
	       We demonstrated that absorbed photons in excess regulate
	       acclimation and immunedefenses in Arabidopsis (1, 2). 
	       We showed that local and systemic response to excess
	       light episode is associated with
	       photo-electro-physiological signaling (PEPS), and
	       changes in the nonphotochemical quenching and reactive
	       oxygen species levels. Therefore, PEPS could be a new
	       component of the signaling network that regulate
	       systemic acquire acclimation (SAA). PEPS propagation
	       speed and its electrical action potential depend on
	       glutathione synthesis in the chloroplasts and functional
	       APX2 that is exclusively express in the bundle sheath
	       cells. PEPS can transduce information from photosystem
	       II of directly stressed chloroplasts to the naive
	       chloroplasts, which never experienced excess light
	       episodes before. DCMU and LaCl3 treatment, and
	       mechanical braking of a petiole vasculature of exposed
	       leaves lead to strongly reduced systemic PEPS changes
	       and to absence of SAA. PEPS is specific for excess of
	       blue and red light, and red but not blue light of the
	       similar provided energy induced both, immunodefence and
	       light acclimation. Different light episodes are
	       differentially memorized and the wavelength-specific
	       cellular light memory is lasting for at least several
	       days. Our results suggest that plants could be an
	       “intelligent” life forms (capable to learn and
	       memorize), and indeed leaves in the dark are able to not
	       only “see” the light (3, 4), but also are able to
	       differently remember its spectral composition and use
	       this memorized information to increase their survival
	       chances.
	       
	       References
	       1.      Mateo et al. (2004). Plant Phys. 136: 2818-2830.
	       2.      Mühlenbock et al. (2008). Plant Cell 20: 2339 -
	       2356.
	       3.      Foyer, C.H. and Noctor G. (1999). Science 284:
	       599–601.
	       4.      Karpinski et al. (1999). Science 284: 654–657.

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