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[Sara El-Esawe]

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> Message: 1
> Date: Sun, 26 May 2013 11:10:02 +0200 (CEST)
> From: contact at psb.vib-ugent.be
> To: meetings at psb.vib-ugent.be
> Subject: [Seminars] PSB event reminder
> Message-ID: <20130526091002.1CC8D803B at psbweb03.psb.ugent.be>
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> Calendar Name: seminars
> Scheduled for: Tuesday, May 28 2013, 11:00 - 12:30
> Event text:    Prof Ueli Grossniklaus
>
> 	       Plant Developmental Genetics
> 	       Institute of Plant Biology
> 	       University of Zürich
>
> 	       Zürich
> 	       Switzerland
> Details:       ?Molecular control of fertilization and interspecific
> 	       hybridization?
>
> 	       ABSTRACT
> 	       Lena Müller, Heike Lindner, Sharon A. Kessler, Michael
> 	       T. Raissig, Hiroko Shimosato-Asano, Ueli Grossniklaus
>
> 	       Research in our laboratory focuses on the developmental
> 	       genetics of plant reproduction, with an emphasis on
> 	       cellular interactions during double fertilization. I
> 	       will focus on the reception of the pollen tube by the
> 	       synergid cells, where the pollen tube arrests growth and
> 	       ruptures to release the sperm cells. We have isolated
> 	       and characterized female gametophytic mutants that
> 	       disrupt pollen tube reception. Pollen tubes that
> 	       encounter such mutant female gametophytes are unable to
> 	       rupture and release the sperm cells (Huck et al.,
> 	       Development 130:2149; Kessler et al., Science 330:968).
> 	       These phenotypes suggest that the female gametophyte
> 	       controls the behaviour of the male gametophyte (pollen)
> 	       in this process. One of the mutants, feronia, was shown
> 	       to affect a receptor-like kinase (Escobar-Restrepo et
> 	       al., Science 317:656), while another, nortia, disrupts a
> 	       seven-transmembrane-domain-protein similar to the
> 	       powdery mildew resistance protein Mlo (Kessler et al.,
> 	       Science 330:968). The identification of additional
> 	       components in this signal transduction cascade suggest
> 	       the involvement of glycosylation in this recognition
> 	       process. Furthermore, interspecific crosses between
> 	       Brassicaceae can result in a similar phenotype,
> 	       suggesting the cell-cell interactions during pollen tube
> 	       reception may be involved in interspecific crossing
> 	       barriers. Using genome-wide association studies, we have
> 	       been able to identify a factor that plays a specific
> 	       role in interspecific compatibility while intraspecific
> 	       crosses are not affected. Thus, pollen tube reception
> 	       may be involved in establishing crossing barriers
> 	       essential to maintain species boundaries similar to
> 	       sperm-egg interactions in animals.
>
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> End of Seminars Digest, Vol 54, Issue 7
> ***************************************