Séminaires de Kai JENSEN et Arp SCHNITTGER (Hamburg University)



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Le vendredi 1er décembre 2017 à 14h00, sallee de réunion de l'UFR SVE, bâtiment 13, Campus de Beaulieu, UR1

Le vendredi 1er décembre 2017 à 14h00, sallee de réunion de l'UFR SVE, bâtiment 13, Campus de Beaulieu, UR1

Wadden Sea salt marshes in a warmer world

Abstract: Salt marshes develop in intertidal areas at sheltered depositional coastlines. Due to the multitude of ecosystem services they deliver, salt marshes are considered as important coastal ecosystems. In this talk, results on current vegetation zonation, on successional pathways and on the development of biodiversity in Wadden Sea salt marshes will be presented. Furthermore, the vulnerability of the ecosystem to accelerated sea level rise will be assessed based on our analyses of accretion rates and organic matter turnover. Finally, a recently established world-unique salt marsh warming experiment will be introduced.

 

Formation and propagation of polyploidy in plants

Abstract: Polyploidy is in particular common among plants and is considered to be one of the driving forces of plant evolution. Polyploid plants often grow more vigorous than their diploid relatives and hence are often invasive species in various ecosystems, as for instance seen in the case of Spartina anglica in salt marshes. However, polyploid plants also have to overcome a number of limitations, e.g. in meiosis due to the increase in chromosome number that is prone to lead to aneuploidy gametes and hence reduced fertility. Here, I will present recent results from my team addressing how plants can become readily polyploid. At the same time, I will present a live imaging system of meiosis that we have recently established in our team and that allows us now to follow in detail the chromosome behavior of diploid versus polyploid plants.

Contacts : Kai JENSEN et Arp SCHNITTGER

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