[Seminars] PSB event reminder
contact at psb.vib-ugent.be
contact at psb.vib-ugent.be
Fri Jun 15 12:10:01 CEST 2012
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)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://maillist.psb.ugent.be/mailman/private/seminars/attachments/20120615/0ddc0e1c/attachment.html
More information about the Seminars
mailing list