ibclogo XVI International Botanical Congess

Abstract Number: 3890
Poster No. = 1820


A MITOCHONDRIAL RPS13 GENE HAS BEEN RETAINED IN MAGNOLIA AND SUNFLOWER BUT NOT IN ONION


Regina, T. M. R. & Quagliariello C., Dipartimento di Biologia Cellulare, Università degli Studi della Calabria, 87030 Arcavacata di Rende, Italy


We investigated the gene for the ribosomal protein S13 (rps13) in the mitochondrial (mt) genome of Magnolia, Helianthus and Allium. A complete rps13 orf has been identified in the mt genome of Magnolia and Helianthus. Conversely, we failed to identify mt rps13 homologous sequences in Allium. Comparison of genomic and cDNA sequences revealed that transcripts from the mt rps13 locus in both Magnolia and Helianthus undergo the process of RNA editing suggesting the functionality of the related gene. All the editing events induce critical changes of codons in the mt rps13 mRNA of Magnolia and Helianthus and, thus, amino acid modifications in the encoded S13 polypeptide. The plant species show differences in both the editing pattern and the completeness of RNA editing.

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