- Seminars - maillist.psb.ugent.be

PSB event reminder
by contact＠psb.vib-ugent.be 05 Jun '11

05 Jun '11

Calendar Name: seminars Scheduled for: Tuesday, June 7 2011, 11:00 - 12:30 Event text: Prof Fran�ois Chaumont Institut des Sciences de la Vie Universit� catholique de Louvain Louvain-la-Neuve Belgium Details: �Plasma membrane aquaporins: a highly regulated plumbing system� ABSTRACT Aquaporins are channels facilitating the movement of water and/or uncharged solutes across membranes in all kingdoms of life. Plant aquaporins constitute a large and highly divergent protein family, and members of several subfamilies are found in the plasma membrane. Recently, we characterized proteins from a new subfamily (XIP or X Intrinsic proteins) found in Solanaceae but absent from Arabidopsis and monocots and showed that they facilitate the transport of many uncharged substrates. Besides this new aquaporin subfamily, the most studied plant plasma membrane aquaporins are the PIPs (Plasma membrane Intrinsic Proteins) that control cellular water movement in many different physiological processes. Using molecular and biophysical approaches, we showed that the expression and activity of the PIPs are regulated in Zea mays roots and leaves according to the developmental stages, day/night cycle and in response to short-term osmotic stress. Beyond the initial regulatory step of controlling gene and protein expression, different mechanisms have been reported to regulate the traffic and gating of PIPs. Maize aquaporins belonging to PIP1 and PIP2 groups formed hetero-oligomers to regulate the traffic of ZmPIP1 from the endoplasmic reticulum to the plasma membrane. In addition, a conserved cysteine residue located in an extra-cytosolic loop is involved in a disulfide bridge formation between two monomers forming a dimer. The delivery of ZmPIP2s to the plasma membrane involves also interaction with the syntaxin SYP121. Altogether the data point toward a complex and highly integrated regulation of PIP trafficking and activity in the maintenance of cellular water homeostasis.

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Seminar Prof Uli Schurr 28/06
by Delphine Verspeel 01 Jun '11

01 Jun '11

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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Seminar Dr Hannele Tuominen 23/06
by Delphine Verspeel 01 Jun '11

01 Jun '11

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 01 Jun '11

01 Jun '11

Calendar Name: seminars Scheduled for: Wednesday, June 1 2011, 11:00 - 12:30 Event text: Dr Jos� M Jim�nez-G�mez Max Planck Institute for Plant Breeding Research Plant Breeding and Genetics Department K�ln GERMANY Details: �RNA-seq analysis in tomato and its wild relatives� ABSTRACT Wild tomato species are native to diverse habitats in South America and show wide morphological and ecological diversity that has proven useful in breeding programs. The current high throughput sequencing technologies have the ability to characterize genome-wide genetic variation in sequences, expression profiles and other molecular events with an effect in adaptation and development. We have used RNA-seq and smallRNA-seq to sequence cultivated tomato (Solanum lycopersicum) and three wild relatives: S. pennellii, S. habrochaites and S. pimpinellifolium, generating up to 50x -150x coverage of their transcriptome. Since only a draft of the genome sequence of cultivated tomato is currently available, it was required to combine well-established methodologies with custom protocols to effectively obtain relevant information from the short reads generated from the wild species. Our approaches have allowed us to infer genome-wide polymorphisms, species-specific expression differences and small RNA landscapes in tomato. I will present the rationale behind the bioinformatic protocols used for our analysis and the results obtained. In addition, we are now integrating the functional and evolutionary information obtained to identify candidate genes underlying phenotypic variation between tomato and its wild relatives.

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Seminar Prof François Chaumont 07/06
by Delphine Verspeel 30 May '11

30 May '11

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 30 May '11

30 May '11

Calendar Name: seminars Scheduled for: Wednesday, June 1 2011, 11:00 - 12:30 Event text: Dr Jos� M Jim�nez-G�mez Max Planck Institute for Plant Breeding Research Plant Breeding and Genetics Department K�ln GERMANY Details: �RNA-seq analysis in tomato and its wild relatives� ABSTRACT Wild tomato species are native to diverse habitats in South America and show wide morphological and ecological diversity that has proven useful in breeding programs. The current high throughput sequencing technologies have the ability to characterize genome-wide genetic variation in sequences, expression profiles and other molecular events with an effect in adaptation and development. We have used RNA-seq and smallRNA-seq to sequence cultivated tomato (Solanum lycopersicum) and three wild relatives: S. pennellii, S. habrochaites and S. pimpinellifolium, generating up to 50x -150x coverage of their transcriptome. Since only a draft of the genome sequence of cultivated tomato is currently available, it was required to combine well-established methodologies with custom protocols to effectively obtain relevant information from the short reads generated from the wild species. Our approaches have allowed us to infer genome-wide polymorphisms, species-specific expression differences and small RNA landscapes in tomato. I will present the rationale behind the bioinformatic protocols used for our analysis and the results obtained. In addition, we are now integrating the functional and evolutionary information obtained to identify candidate genes underlying phenotypic variation between tomato and its wild relatives.

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Seminar Dr José M Jiménez-Gómez 01/06
by Delphine Verspeel 25 May '11

25 May '11

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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Upcoming seminars June
by Delphine Verspeel 25 May '11

25 May '11

Dear All, Enclosed you can find our upcoming seminars 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: +32/33.13.809 Http://www.psb.ugent.be despe(a)psb.vib-ugent.be <mailto:nahau@psb.vib-ugent.be>

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PSB event reminder
by contact＠psb.vib-ugent.be 11 May '11

11 May '11

Calendar Name: seminars Scheduled for: Wednesday, May 11 2011, 14:00 - 15:30 Event text: Dr Hinanit Koltai Department Of Ornamental Horticulture Institute of Plant Sciences ARO, Volcani center Bet-Dagan ISRAEL Details: �Strigolactones are regulators of root development� ABSTRACT Strigolactones (SLs) or associated molecules were defined as a new group of plant hormones that suppress lateral shoot branching. Recently, we have demonstrated that SLs are regulators of root development: they regulate lateral root formation and root hair elongation. Moreover, the epistatic relations between SLs, auxin and ethylene were determined in the wild type and hormone-signaling mutants. In tomato SLs were shown to interfere with the activity of auxin-efflux carriers in the presence of exogenously applied auxin, thereby affecting primary root growth, cell elongation and root hair elongation in tomato. In Arabidopsis SLs and ethylene were found to regulate root hair elongation via a common regulatory pathway, in which ethylene is epistatic to SLs, whereas SLs' effect on root hair elongation requires ethylene synthesis. SL signaling was not needed for the auxin root hair-response. Auxin signaling, on the other hand, was not necessary, but enhanced the root hair response to SLs. The results suggest that the SL, ethylene and auxin hormonal pathways converge for regulation of root hair elongation. Moreover, SL regulation of root growth suggests that these hormones are mediators of plant responses to nutritional conditions and coordinators of shoot and root development. However, SLs are also signal molecules that facilitate hyphal branching of the symbiotic arbuscular mycorrhizal fungi and thus, plant-symbiotic interactions. The two roles played by SLs, in plant development and symbiotic communication, may imply their evolution as either modulators of plant development or enhancers of beneficial plant associations.

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PSB event reminder
by contact＠psb.vib-ugent.be 10 May '11

10 May '11

Calendar Name: seminars Scheduled for: Tuesday, May 10 2011, 11:00 - 12:30 Event text: Dr Keiko Sugimoto RIKEN Plant Science Center Tsurumi, Yokohama JAPAN Details: �Transcriptional control of plant cell dedifferentiation by WIND1� ABSTRACT Many multicellular organisms have a remarkable capacity to regenerate new organs after wounding. As a first step of organ regeneration, adult somatic cells often dedifferentiate to reacquire cell proliferation potential but mechanisms underlying this control remain unknown in plants. We have recently shown that an AP2/ERF transcription factor WOUND-INDUCED DEDIFFERENTIATION 1 (WIND1) participates in the regulation of cell dedifferentiation in Arabidopsis (Iwase et al. 2011). WIND1 is rapidly induced at the wound site and it promotes cell dedifferentiation and subsequent formation of callus, a mass of pluripotent cells. We further demonstrate that ectopic overexpression of WIND1 is sufficient to establish and maintain the dedifferentiated status of somatic cells without exogenous auxin and cytokinin. An in vivo imaging of a synthetic cytokinin reporter reveals that wounding up-regulates the B-type ARABIDOPSIS RESPONSE REGULATOR (ARR)-mediated cytokinin response and that WIND1 acts via the ARR-dependent signaling pathway to promote cell dedifferentiation. Discovery of WIND1 provides a new molecular basis to further dissect how transcriptional regulators reprogram cellular differentiation status in plants. Iwase A et al. The AP2/ERF transcription factor WIND1 controls cell dedifferentiation in Arabidopsis. Curr Biol 21: 508-514 (2011)

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