Mitochondrial genome structure of rice suspension culture from cytoplasmic male-sterile line (A-58CMS): reappraisal of the master circle |
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| Authors: | K Yamato Y Ogura T Kanegae Y Yamada K Ohyama |
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| Institution: | (1) Laboratory of Plant Molecular Biology, Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto University, 606 Kyoto, Japan;(2) Laboratory of Molecular and Cellular Biology, Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto University, 606 Kyoto, Japan;(3) Present address: Research Institute for Bioresources, Okayama University, 710 Kurashiki, Japan |
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| Abstract: | Summary The mitochondrial DNA (mtDNA) from the cultured cells of a cytoplasmic male-sterile line (A-58CMS) of rice (Oryza sativa) was cloned and its physical map was constructed. There was structural alteration on the mitochondrial genome during the cell culture. Detailed restriction analysis of cosmid clones having mtDNA fragments suggested either that the master genome has a 100-kb duplication (the genome size becomes 450 kb) or that a master circle is not present in the genome (the net structural complexity becomes 350 kb). The physical map of plant mitochondrial genomes thus far reported is illustrated in a single circle, namely a master circle. However, no circular DNA molecule corresponding to a master circle has yet been proved. In the present report, representation of plant mitochondrial genomes and a possibility for mitochondrial genome without a master circle are discussed. |
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| Keywords: | Cytoplasmic male sterility Cultured cell Rice mtDNA Physical map Master circle |
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