Is Alnus viridis 'a' glacial relict in the Black Forest ?

Using light dependent-morphogenesis to study the adaptive change of a population and ventured the extensive study of a chloroplast DNA-marker, to understand the evolutionary relationship between different populations of Green Alder (A. viridis) from the Black Forest and the European Alps. Looking at the photomorphogenesis as an indicative trait to test, whether the divergence between the Alpine and the Black-Forest population of Green Alder has already resulted in adaptive changes related to the changed habitat conditions. Flavonoid induction in the hypocotyl is under control of short-wavelength light. The most important photoreceptor seems to be the UV-B receptor, whose action is complemented by UV-A/BL receptor(s). Phytochromes are not involved. A similar result is observed for the anthocyanins one of the end products of the flavonoid biosynthesis. In contrast, phytochromes are clearly involved in the regulation of flavonoid induction in the cotyledons. The significant differences in responsiveness and sensitivity between the Alpine, the Black-Forest, and the pre-Alpine population: Whereas flavonoid and anthocyanin synthesis in the hypocotyl are dominated by the UV-B receptor in the Alpine population, the Black-Forest population is characterized by a stronger influence of the UV-A/BL receptor system. The pre-Alpine population is somewhat intermediate, in terms of flavonoid induction it resembles the Alpine population, in terms of anthocyanin synthesis, it is closer to the Black-Forest population. Interestingly, the rate of dark germination is much higher in the Black-Forest population as compared to the other two populations. <br>To find the relationship among different populations of A. viridis and other Alnus species. I compared the sequences of the noncoding trnT-trnF (trnT-L and trnL-F-spacers and trnL-intron) region of the chloroplast genome. Based on the base-pair variations, in the trnL-trnF region all individual population of A. viridis were cluster into 9 groups. However, within the Black Forest at least six different groups of A. viridis were identified under four glacial relict populations that coexist in some times close vicinity. <br>Genetic diversity in the context of population history and present-day distribution, substitution variations were used to estimate the divergence times when two given populations presumably separated. The extent of gene flow between the different populations in the Black Forest might be negligible.

Author dc:creator

• Kamruzzahan, Sultana

Contributors dc:contributor

• Nick, Peter

• Green Alder
• Black Forest
• European Alps
• Photoreceptor
• Flavonoid
• Anthocyanin
• Phylogeny
• Molecular Clock

Repository record source_url

https://freidok.uni-freiburg.de/data/1189

OAI identifier oai:identifier

oai:freidok.uni-freiburg.de:1189