- Seminars - maillist.psb.ugent.be

Seminar Prof Kathleen Marchal
by Delphine Verspeel 20 Nov '12

20 Nov '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

1 0

Seminar Dr Mieke Van Lijsebettens
by Delphine Verspeel 12 Nov '12

12 Nov '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

1 0

PSB event reminder
by contact＠psb.vib-ugent.be 08 Nov '12

08 Nov '12

Calendar Name: seminars Scheduled for: Thursday, November 8 2012, 11:00 - 12:30 Event text: Dr Pierre Rouz� VIB, Dept. of Plant Systems Biology Ghent University Gent BELGIUM Details: �Of Mamiellales, the green yeasts, as models for Plant Systems Biology, and of mobile introns� ABSTRACT The interest of plant scientists for Mamiellales, comes from the assumption that the ancestor to all other Viridiplantae was part of it. Mamiellales are widespread marine picoplankters and the complete genome sequence has been obtained for six of these unicellular green algae, including Ostreococcus (x3) , Micromonas (x2) and Bathycocus, all of these annotated by our group in Ghent. These genomes are small, from 13 to 22Mb, harboring from 7.500 to 10.000 genes showing no duplication in most cases. Added to easy cultivation and replacement mutation, these features makes these algae, especially the tiny Ostreococcus tauri, an interesting model to study gene networks for the traits which are conserved within the green lineage, bringing a frame on which to branch the duplication complexity of higher plants, in the same way yeasts are used towards animals. The sequenced genomes of Mamiellales have a unique heterogeneity, two chromosomes having specific features compared the rest of the genome, which may be related to sex and speciation. I will also present and discuss in this talk the unexpected observation that the genomes of the two Micromonas species which have been sequenced harbor many invading introns which are copies of each other, and are inserted at novel positions in the genes. This was the first observation of this kind of event; it illuminates the way intron can be gained, and shakes the current assumption that introns have been acquired at the birth of eukaryotes and have essentially been lost since.

1 0

PSB event reminder
by contact＠psb.vib-ugent.be 06 Nov '12

06 Nov '12

Calendar Name: seminars Scheduled for: Thursday, November 8 2012, 11:00 - 12:30 Event text: Dr Pierre Rouz� VIB, Dept. of Plant Systems Biology Ghent University Gent BELGIUM Details: �Of Mamiellales, the green yeasts, as models for Plant Systems Biology, and of mobile introns� ABSTRACT The interest of plant scientists for Mamiellales, comes from the assumption that the ancestor to all other Viridiplantae was part of it. Mamiellales are widespread marine picoplankters and the complete genome sequence has been obtained for six of these unicellular green algae, including Ostreococcus (x3) , Micromonas (x2) and Bathycocus, all of these annotated by our group in Ghent. These genomes are small, from 13 to 22Mb, harboring from 7.500 to 10.000 genes showing no duplication in most cases. Added to easy cultivation and replacement mutation, these features makes these algae, especially the tiny Ostreococcus tauri, an interesting model to study gene networks for the traits which are conserved within the green lineage, bringing a frame on which to branch the duplication complexity of higher plants, in the same way yeasts are used towards animals. The sequenced genomes of Mamiellales have a unique heterogeneity, two chromosomes having specific features compared the rest of the genome, which may be related to sex and speciation. I will also present and discuss in this talk the unexpected observation that the genomes of the two Micromonas species which have been sequenced harbor many invading introns which are copies of each other, and are inserted at novel positions in the genes. This was the first observation of this kind of event; it illuminates the way intron can be gained, and shakes the current assumption that introns have been acquired at the birth of eukaryotes and have essentially been lost since.

1 0

Seminar Dr Leah R Band on Monday, November 12 at 11 am
by Delphine Verspeel 30 Oct '12

30 Oct '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

1 0

Seminar Dr Pierre Rouzé
by Delphine Verspeel 29 Oct '12

29 Oct '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

1 0

Upcoming seminars November
by Delphine Verspeel 29 Oct '12

29 Oct '12

Dear All, Enclosed you can find our upcoming seminars for November. 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

1 1

PSB event reminder
by contact＠psb.vib-ugent.be 26 Oct '12

26 Oct '12

Calendar Name: seminars Scheduled for: Friday, October 26 2012, 14:00 - 15:30 Event text: Prof Pierre JGM de Wit Laboratory of Phytopathology Wageningen University Wageningen THE NETHERLANDS Details: �The genomes of the related fungal pathogens Cladosporium fulvum and Dothistroma septosporum reveal adaptation to different hosts and lifestyles� ABSTRACT We sequenced and compared the genomes of the Dothideomycete fungal plant pathogens Cladosporium fulvum (Cfu) (syn. Passalora fulva) and Dothistroma septosporum (Dse) that are closely related phylogenetically, but have different lifestyles and hosts. Although both fungi grow extracellularly in close contact with host mesophyll cells, Cfu is a biotroph infecting tomato, while Dse is a hemibiotroph infecting pine. The genomes of these fungi have a similar set of genes (70% of gene content in both genomes are homologs), but differ significantly in size (Cfu >61.1 Mb; Dse 31.2 Mb), which is mainly due to the difference in repeat content (47.2% in Cfu versus 3.2% in Dse). Recent adaptation to different lifestyles and hosts is suggested by diverged sets of genes. Cfu contains an α-tomatinase gene that we predict might be required for detoxification of tomatine, whilst this gene is absent in Dse. Many genes encoding secreted proteins are unique to each species and the repeat-rich areas in Cfu are enriched for these species-specific genes. In contrast, conserved genes suggest common host ancestry. Homologs of Cfu effector genes, including Ecp2 and Avr4, are present in Dse and induce a Cf-Ecp2- and Cf-4-mediated hypersensitive response, respectively. Strikingly, genes involved in production of the toxin dothistromin, a likely virulence factor for Dse, are conserved in Cfu, but their expression differs markedly with essentially no expression by Cfu in planta. Likewise, Cfu has a carbohydrate-degrading enzyme catalog that is more similar to that of necrotrophs or hemibiotrophs and a larger pectinolytic gene arsenal than Dse, but many of these genes are not expressed in planta or are pseudogenized. Overall, comparison of their genomes suggests that these closely related plant pathogens had a common ancestral host but since adapted to different hosts and lifestyles by a combination of differentiated gene content, pseudogenization and gene regulation.

1 0

PSB event reminder
by contact＠psb.vib-ugent.be 24 Oct '12

24 Oct '12

Calendar Name: seminars Scheduled for: Friday, October 26 2012, 14:00 - 15:30 Event text: Prof Pierre JGM de Wit Laboratory of Phytopathology Wageningen University Wageningen THE NETHERLANDS Details: �The genomes of the related fungal pathogens Cladosporium fulvum and Dothistroma septosporum reveal adaptation to different hosts and lifestyles� ABSTRACT We sequenced and compared the genomes of the Dothideomycete fungal plant pathogens Cladosporium fulvum (Cfu) (syn. Passalora fulva) and Dothistroma septosporum (Dse) that are closely related phylogenetically, but have different lifestyles and hosts. Although both fungi grow extracellularly in close contact with host mesophyll cells, Cfu is a biotroph infecting tomato, while Dse is a hemibiotroph infecting pine. The genomes of these fungi have a similar set of genes (70% of gene content in both genomes are homologs), but differ significantly in size (Cfu >61.1 Mb; Dse 31.2 Mb), which is mainly due to the difference in repeat content (47.2% in Cfu versus 3.2% in Dse). Recent adaptation to different lifestyles and hosts is suggested by diverged sets of genes. Cfu contains an α-tomatinase gene that we predict might be required for detoxification of tomatine, whilst this gene is absent in Dse. Many genes encoding secreted proteins are unique to each species and the repeat-rich areas in Cfu are enriched for these species-specific genes. In contrast, conserved genes suggest common host ancestry. Homologs of Cfu effector genes, including Ecp2 and Avr4, are present in Dse and induce a Cf-Ecp2- and Cf-4-mediated hypersensitive response, respectively. Strikingly, genes involved in production of the toxin dothistromin, a likely virulence factor for Dse, are conserved in Cfu, but their expression differs markedly with essentially no expression by Cfu in planta. Likewise, Cfu has a carbohydrate-degrading enzyme catalog that is more similar to that of necrotrophs or hemibiotrophs and a larger pectinolytic gene arsenal than Dse, but many of these genes are not expressed in planta or are pseudogenized. Overall, comparison of their genomes suggests that these closely related plant pathogens had a common ancestral host but since adapted to different hosts and lifestyles by a combination of differentiated gene content, pseudogenization and gene regulation.

1 0

PSB event reminder
by contact＠psb.vib-ugent.be 19 Oct '12

19 Oct '12

Calendar Name: seminars Scheduled for: Friday, October 19 2012, 14:00 - 15:30 Event text: Prof Frank Van Breusegem VIB, Dept. of Plant Systems Biology Ghent University Gent BELGIUM Details: �Oxidative Stress Signal Transduction� ABSTRACT Different biotic and abiotic stresses adversely affect plant growth and development. A common theme within these environmental factors is the perturbation of reactive oxygen species (ROS) homeostasis. The signal transduction mechanisms of the oxidative stress response in plants are poorly understood. W e conducted genetic and chemical screens, which combined with proteomic approaches will lead to a more comprehensive overview on the components of the network that govern the oxidative stress response. These efforts resulted in the identification of a number of genes as new members of the oxidative stress gene network in plants. In our recent studies, we have identified a novel transcriptional regulator of the mitochondrial retrograde regulation and are assessing the modulation of cellular NAD(P) homeostasis through the perturbation of sirtuins as a new strategy to improve plant performance in stress conditions.

1 0