- Seminars - maillist.psb.ugent.be

PSB event reminder
by contact＠psb.vib-ugent.be 15 Jun '12

15 Jun '12

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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PSB event reminder
by contact＠psb.vib-ugent.be 13 Jun '12

13 Jun '12

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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seminar 21/06 Prof Pierre Hilson
by Nathalie Vanden Hautte 11 Jun '12

11 Jun '12

You are receiving this e-mail because you subscribed to our seminars announcements and reminders service at https://maillist.psb.ugent.be/mailman/listinfo/seminars . If you do not wish to receive this information anymore, please unsubscribe from future mailings at https://maillist.psb.ugent.be/mailman/options/seminars . cid:946540515@15122008-0D1CPSBcid:946540515@15122008-0D23 VIB - Department of Plant Systems Biology Technologiepark 927 B - 9052 Gent/Zwijnaarde Phone: +32 9 33 13 800 Fax: +32 9 33 13 809 Http://www.psb.vib-ugent.be

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PSB event reminder
by contact＠psb.vib-ugent.be 07 Jun '12

07 Jun '12

Calendar Name: seminars Scheduled for: Thursday, June 7 2012, 11:00 - 12:30 Event text: Prof Gerrit Beemster Laboratory for Molecular Plant Physiology and Biotechnology University of Antwerp Antwerp BELGIUM Details: �Virtual Leaf 2.0: An improved tool to model plant growth regulation� ABSTRACT Virtual leaf is a software package that we developed for the simulation of hormone transport and growth regulation in multicellular plant organs. Over the last few years we have further refined this tool, so that we will be able to release a completely new version soon. Improvements encompass technical aspects such as a version tracking system for the software development, output to a standard format (hdf5) for import in external viewers and code optimization for faster performance. In terms of biology we have developed adaptations to enable the modelling of root tipgrowth. We also implemented more physiological realistic models for the regulation of cell expansion and cell division. Finally we have developed bifurcation analysis techniques to investigate the effect and importance of individual model parameters on the overall behaviour.

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Upcoming seminars June
by Delphine Verspeel 05 Jun '12

05 Jun '12

Dear All, Enclosed you can find the final list for June. Kind regards, Delphine ----- Oorspronkelijk bericht ----- Van: "Delphine Verspeel" <despe(a)psb.vib-ugent.be> Aan: all(a)psb.vib-ugent.be Verzonden: Donderdag 31 mei 2012 11:08:41 Onderwerp: Upcoming seminars June Dear All, Enclosed you can find the updated list for June. Kind regards, Delphine ----- Oorspronkelijk bericht ----- Van: "Delphine Verspeel" <despe(a)psb.vib-ugent.be> Aan: meetings(a)psb.vib-ugent.be Verzonden: Woensdag 23 mei 2012 12:00:18 Onderwerp: [Seminars] Upcoming seminar June Dear All, Enclosed you can find our upcoming seminar for June. Kind regards, Delphine _________________________________________ Delphine Verspeel Administrative Assistant VIB, Department of Plant Systems Biology Ghent University Technologiepark 927 9052 Gent Belgium Phone: +32/9/33.13.800 Fax: +32/9/33.13.809 Http://www.psb.ugent.be despe(a)psb.vib-ugent.be _______________________________________________ Seminars mailing list Seminars(a)psb.ugent.be https://maillist.psb.ugent.be/mailman/listinfo/seminars

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15/06 seminar Prof Stanislaw Karpinski
by Nathalie Vanden Hautte 05 Jun '12

05 Jun '12

You are receiving this e-mail because you subscribed to our seminars announcements and reminders service at https://maillist.psb.ugent.be/mailman/listinfo/seminars . If you do not wish to receive this information anymore, please unsubscribe from future mailings at https://maillist.psb.ugent.be/mailman/options/seminars . cid:946540515@15122008-0D1CPSBcid:946540515@15122008-0D23 VIB - Department of Plant Systems Biology Technologiepark 927 B - 9052 Gent/Zwijnaarde Phone: +32 9 33 13 800 Fax: +32 9 33 13 809 Http://www.psb.vib-ugent.be

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PSB event reminder
by contact＠psb.vib-ugent.be 05 Jun '12

05 Jun '12

Calendar Name: seminars Scheduled for: Thursday, June 7 2012, 11:00 - 12:30 Event text: Prof Gerrit Beemster Laboratory for Molecular Plant Physiology and Biotechnology University of Antwerp Antwerp BELGIUM Details: �Virtual Leaf 2.0: An improved tool to model plant growth regulation� ABSTRACT Virtual leaf is a software package that we developed for the simulation of hormone transport and growth regulation in multicellular plant organs. Over the last few years we have further refined this tool, so that we will be able to release a completely new version soon. Improvements encompass technical aspects such as a version tracking system for the software development, output to a standard format (hdf5) for import in external viewers and code optimization for faster performance. In terms of biology we have developed adaptations to enable the modelling of root tipgrowth. We also implemented more physiological realistic models for the regulation of cell expansion and cell division. Finally we have developed bifurcation analysis techniques to investigate the effect and importance of individual model parameters on the overall behaviour.

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Seminar Prof Gerrit Beemster 07/06
by Delphine Verspeel 01 Jun '12

01 Jun '12

You are receiving this e-mail because you subscribed to our seminars announcements and reminders service at <https://maillist.psb.ugent.be/mailman/listinfo/seminars> https://maillist.psb.ugent.be/mailman/listinfo/seminars. If you do not wish to receive this information anymore, please unsubscribe from future mailings at <https://maillist.psb.ugent.be/mailman/options/seminars> https://maillist.psb.ugent.be/mailman/options/seminars. cid:946540515@15122008-0D1C PSB cid:946540515@15122008-0D23 VIB - Department of Plant Systems Biology Technologiepark 927 B - 9052 Gent/Zwijnaarde Phone: +32 9 33 13 800 Fax: +32 9 33 13 809 Http://www.psb.vib-ugent.be

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PSB event reminder
by contact＠psb.vib-ugent.be 29 May '12

29 May '12

Calendar Name: seminars Scheduled for: Tuesday, May 29 2012, 11:00 - 12:30 Event text: Prof Jim Whelan ARC Centre of Excellence in Plant Energy Biology University of Western Australia Crawley AUSTRALIA Details: � Mitochondrial Biogenesis in Plants� ABSTRACT In addition to playing central roles in energy and carbon metabolism, mitochondria are biosynthetic factories for a variety of compounds, a target for various stresses and also play an integral role in stress responses. The control of these processes is achieved in an integrated manner with a variety of other cellular functions that occur in other organelles. Mitochondrial mass and composition varies in a cell specific manner to achieve these various functions in response to internal and external stimuli. Studies in our laboratory are aimed at understanding the molecular components required to regulate mitochondrial function and make mitochondria. Examples of the systems used to study these processes include; seed germination, where mitochondria undergo a rapid transition from metabolically inert organelles to highly metabolically active organelles in a short period of time; mitochondrial responses to stress and the components mediating these responses; and finally functional characterization of the machinery required to make mitochondria. Taken together, the results from these experiments reveal that, not only is mitochondrial function integrated with various cellular processes, but that mitochondrial function plays important signaling roles in defining these processes throughout the cell.

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PSB event reminder
by contact＠psb.vib-ugent.be 27 May '12

27 May '12

Calendar Name: seminars Scheduled for: Tuesday, May 29 2012, 11:00 - 12:30 Event text: Prof Jim Whelan ARC Centre of Excellence in Plant Energy Biology University of Western Australia Crawley AUSTRALIA Details: � Mitochondrial Biogenesis in Plants� ABSTRACT In addition to playing central roles in energy and carbon metabolism, mitochondria are biosynthetic factories for a variety of compounds, a target for various stresses and also play an integral role in stress responses. The control of these processes is achieved in an integrated manner with a variety of other cellular functions that occur in other organelles. Mitochondrial mass and composition varies in a cell specific manner to achieve these various functions in response to internal and external stimuli. Studies in our laboratory are aimed at understanding the molecular components required to regulate mitochondrial function and make mitochondria. Examples of the systems used to study these processes include; seed germination, where mitochondria undergo a rapid transition from metabolically inert organelles to highly metabolically active organelles in a short period of time; mitochondrial responses to stress and the components mediating these responses; and finally functional characterization of the machinery required to make mitochondria. Taken together, the results from these experiments reveal that, not only is mitochondrial function integrated with various cellular processes, but that mitochondrial function plays important signaling roles in defining these processes throughout the cell.

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