Ribosomal gene numbers in Microseridinae (Compositae: Cichorieae) |
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| Authors: | V Hemleben K Bachmann H J Price |
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| Institution: | (1) Institute of Biology II, University of Tübingen, Auf der Morgenstelle 28, D-7400 Tübingen, (Federal Republic of Germany);(2) Premedical Biology Program, University of Heidelberg, Im Neuenheimer Feld 504, D-6900 Heidelberg 1, (Federal Republic of Germany);(3) Department of Plant Sciences, Texas A&M University, 77843 College Station, Texas, USA |
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| Abstract: | Summary 8 species of the subtribe Microseridinae contain between 1100 and 3400 genes for 25 and 18 S ribosomal RNA. The gene numbers seem to evolve by discrete steps. Their trend follows a general reduction in genome size during the evolution of the annual species ofMicroseris, but numbers remain high in one of them and inAgoseris grandiflora. 2 species ofPyrrhopappus differ by a duplication of the ribosomal gene numbers; 5 S ribosomal RNA genes in 4 species are repeated roughly 10,000 times.We thank Miss S. Werner, Miss A. Roth and Miss U. Krehan for help with some of the experiments. This paper is part of a project supported by grant Ba 536/1-5 from the Deutsche Forschungsgemeinschaft. |
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