Striking differences in mitochondrial tRNA import between different plant species |
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| Authors: | R Kumar I Small L Maréchal-Drouard and K Akama |
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| Institution: | (1) Station de Génétique et d'Amélioration des Plantes, INRA, Route de St-Cyr, 78026 Versailles Cédex, France;(2) Institut de Biologie Moléculaire des Plantes du CNRS, Université Louis Pasteur, 12 rue du Général Zimmer, F-67084 Strasbourg Cédex, France;(3) Department of Biology, Faculty of Science, Shimane University, 690 Matsue, Japan;(4) Present address: Department of Biochemistry, University of Adelaide, 5005 Adelaide, SA, Australia |
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| Abstract: | A systematic comparison of the tRNAs imported into the mitochondria of larch, maize and potato reveals considerable differences among the three species. Larch mitochondria import at least eleven different tRNAs (more than half of those tested) corresponding to ten different amino acids. For five of these tRNAs tRNAPhe(GAA), tRNALys(CUU), tRNAPro(UGG), tRNASer(GCU) and tRNASer(UGA)] this is the first report of import into mitochondria in any plant species. There are also differences in import between relatively closely related plants; wheat mitochondria, unlike maize mitochondria import tRNAHis, and sunflower mitochondria, unlike mitochondria from other angiosperms tested, import tRNASer(GCU) and tRNASer(UGA). These results suggest that the ability to import each tRNA has been acquired independently at different times during the evolution of higher plants, and that there are few apparent restrictions on which tRNAs can or cannot be imported. The implications for the mechanisms of mitochondrial tRNA Import in plants are discussed. |
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| Keywords: | Mitochondria tRNA Import Maize Potato Larch |
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