[Seminars] PSB event reminder
contact at psb.vib-ugent.be
contact at psb.vib-ugent.be
Sun May 26 11:10:02 CEST 2013
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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