28 research outputs found
Einfluß langjähriger Winterweizen-Monokultur auf Ertragsbildung, Krankheitsbefall und Nematodenbesatz im Vergleich zum Winterweizenanbau in der Fruchtfolge
Biological records of climate change in lake sediments. In Frenzel, B. et al (Hrsg.) Palaeohydrology as reflected in lake-level changes as climatic evidence for Holocene times. Spec. issue ESF Project
The effects of formalin, nabam, irrigation and nitrogen on Heterodera avenae Woll., Ophiobolus graminis Sacc. and the growth of spring wheat
Effect of Thermal Energy Intensity on Time and Rate of Nitrogen Accumulation by Maize (Zea mays L.)
Effect of Thermal Energy Intensity on Time and Rate of Nitrogen Accumulation by Maize (Zea mays L.)
Chloroplast DNA phylogeography of European ashes, Fraxinus sp. (Oleaceae): Roles of hybridization and life history traits
We investigated range-wide phylogeographic variation in three European ash species (Fraxinus sp. Oleaceae). Chloroplast DNA (cpDNA) microsatellites were typed in the thermophilous Fraxinus angustifolia and Fraxinus ornus and the observed haplotypes and the geographic distribution of diversity were compared to cpDNA data previously obtained in the more cold-tolerant Fraxinus excelsior. We found wide-ranging haplotype sharing between the phylogenetically close F. angustifolia and F. excelsior, suggesting hybridization (i) in common glacial refuges in the Iberian Peninsula, northern Italy, the eastern and/or Dinaric Alps and the Balkan Peninsula, and/or (ii) during postglacial recolonization. The data allowed us to propose additional glacial refuges for F. angustifolia in southern Italy and in Turkey, and populations from the latter region were particularly polymorphic. There was evidence for refuge areas in Italy, the Balkan Peninsula and Turkey for F. ornus, which did not share any single chloroplast haplotype with the other species. In both F. angustifolia and F. ornus, cpDNA diversity (hS = 0.027 and hS = 0.009, respectively) was lower and fixation levels (GST = 0.964 and GST = 0.983, respectively) higher than in sympatric F. excelsior (hS = 0.096, GST = 0.870). These diversity patterns could be due to temperature tolerance or the demographic history. © 2006 Blackwell Publishing Ltd.SCOPUS: ar.jFLWINinfo:eu-repo/semantics/publishe