Doctoral Student Position Plant Sciences

October 24, 2007
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We are seeking a highly motivated doctoral student with strong interests in
evolutionary biology and mycology. Candidates should have a Diploma or
Master's degree in Biology or Plant Sciences.

Significance of hybridization in asexual fungal endophytes of grasses

Interspecific hybridization with creation of new lineages or species is a
well known phenomenon in plants and animals, but is largely unexplored
in fungi. Asexual Epichloë endophytes of grasses (referred to the
anamorph genus Neotyphodium) represent the most prominent case of
abundant interspecific hybridizations. Epichloë endophytes (Ascomycota,
Clavicipitaceae) are wide-spread in pooid grasses forming systemic
associations with their hosts that span the continuum from antagonism to
mutualism. The majority of Neotyphodium endophytes that have been
analyzed phylogenetically are heteroploid hybrids with two or more sexual
Epichloë species as ancestors. Hybrids are maintained through
successive host generations by vertical transmission and often dominate
in natural populations and over large geographical ranges. It has been
suggested that hybridizations provide a selective advantage over
non-hybrids by substituting for sexual recombination or by acquiring
beneficial genes that strengthen their mutualistic capabilities. However,
none of these hypotheses has been tested.
The overall objective of this research proposal is to investigate the
significance of hybrid Neotyphodium endophytes for the ecological fitness
of their host plants in different environments. As study system we will use
the woodland grass Hordelymus europaeus that is known to be host of
hybrid and non-hybrid endophytes. Epichloë endophytes offer a model
system on which fundamental questions regarding the evolution of
mutualisms can be studied.

Institute of Integrative Biology, Plant Ecological Genetics,
Universitätstrasse 16, CH-8092 Zürich

http://www.peg.ethz.ch/

Email
adrian.leuchtmann@env.ethz.ch

From: http://64.233.183.104/search?q=cache:wVwRpzG4G4UJ:www.telejob.ch/telejob/offer_pdf.pdf%3Foffer%3D9896%26language%3Den+phd+position+filetype:pdf&hl=en&ct=clnk&cd=1&gl=uk&client=firefox-a

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