[Seminars] PSB event reminder
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Thu Jun 24 09:10:01 CEST 2010
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:
599601.
4. Karpinski et al. (1999). Science 284: 654657.
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