[Seminars] PSB event reminder

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Calendar Name: seminars
Scheduled for: Friday, June 15 2012, 14:00 - 15:30
Event text:    Prof Stanislaw M. Karpiński
	       
	       Dept. of Plant Genetics, Breeding & Biotechnology
	       Faculty of Horticulture & Landscape Architecture
	       Warsaw University of Life Sciences
	       
	       Warsaw
	       POLAND
Details:       “Quantum-molecular, photo-electrochemical and
	       algorithmic regulation of Darwinian fitness in
	       Arabidopsis”
	       
	       ABSTRACT
	       In a simplified model of photosynthesis, light energy
	       absorbed by chlorophylls of photosystem II is
	       distributed between photochemistry, fluorescence, and
	       heat. Spectrally and time-resolved fluorescence combined
	       with foliar heat dynamics measurements demonstrates that
	       higher plants evolved genetic and physiological global
	       regulatory system, which optimizes photosystem II
	       quantum-molecular functions and the fate of photons
	       absorbed in excess (1, 2). Our results indicate the role
	       of the PsbS and the photosystem II antenna organization
	       in efficient en discrete global regulation of the rates
	       between photochemistry, fluorescence, and heat (3). This
	       in turn specifically influences global electrochemical
	       signalling and regulates growth, acclamatory and defense
	       responses in Arabidopsis. 
		       Changes in phytochemistry, water use efficiency,
	       hormonal and reactive oxygen species cellular
	       homeostasis and seed yield of Arabidopsis can be defined
	       by the exponential function and simple equation with
	       natural logarithm (y = y0*e-Kx), that depends on
	       molecular regulators: LESION SIMULATING DISEASE 1
	       (LSD1), ENHANCED DISEASE SUSCEPTIBILITY 1 (EDS1) and
	       PHYTOALEXIN DEFICIENT 4 (PAD4) (4-8). The LSD1 recessive
	       null mutant (lsd1) regardless of permissive laboratory
	       or non-permissive laboratory and field conditions
	       demonstrates constant seed yield, but significant
	       variation in phytochemistry and water use efficiencies,
	       and in foliar transcriptomes that depend on EDS1 and
	       PAD4. Obtained results suggest that LSD1/EDS1/PAD4
	       constitute at least tree component molecular machinery
	       regulating plant Darwinian fitness. Our experiments
	       supported with mathematical modelling indicate that
	       Arabidopsis plants perform discrete global regulation of
	       the rates between photochemistry, fluorescence and heat,
	       thus perform biological processing aimed at optimizing
	       and integrating photosynthesis, water use efficiency,
	       reactive oxygen species and hormonal cellular
	       homeostasis. This processing allows to reach the best
	       possible seed yield and Darwinian fitness in
	       multivariable natural environment. 
	       
	       1.      K. Asada, Annu. Rev. Plant Physiol. Plant Mol.
	       Biol. 50:601-639 (1999).
	       2.      S. Karpiński, et al., Science 284: 654-657
	       (1999).
	       3.      Kulasek et al., submitted (2012)
	       4.      Mateo et al., Plant Physiol. 136: 2818-3280
	       (2004)
	       5.      Muhlenbock et al., Plant Cell 19: 3819-3830
	       (2007)
	       6.      Muhlenbock et al., Plant Cell 20: 2339-2356
	       (2008)
	       7.      Szechynska-Hebda et al., Plant Cell 22:
	       2201-2218 (2010)
	       8.      Wituszyńska et al. submitted (2012)

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