On the mechanism of cytoplasmic male sterility in the 447 line of Vicia faba |
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| Authors: | Tom Turpen Stephen J Garger Laurence K Grill |
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| Institution: | (1) Zoecon Research Institute, Sandoz Crop Protection Corp., 975 California Ave., 94304-1104 Palo Alto, CA, USA;(2) Present address: Department of Plant Pathology, University of California, 92521 Riverside, CA, USA;(3) Present address: Biosource Genetics Corp., 3333 Vaca Valley Parkway, 95688 Vacaville, CA, USA |
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| Abstract: | The trait of cytoplasmic male sterility, expressed in plants bearing the 447 cytoplasm of Vicia faba, is uniquely and positively correlated with the presence of a linear double-stranded RNA molecule (dsRNA) 16.7 kb in size. Restriction enzyme digestion profiles of mitochondrial DNA isolated from fertile and cytoplasmic malesterile (CMS) lines do show a limited number of specific differences in fragment intensities and mobilities. However, mitochondria isolated from the progeny of the cross CMS × Restorer line contain DNA with an identical restriction profile as the male-sterile parent: moreover, subsequent generations are completely and permanently fertile, even upon segregation of the nuclear restoration gene. Southern hybridizations, using cDNA clones as probes, reveal homology between the CMS-associated dsRNA and the nuclear genome of both sterile and fertile lines. The regions cloned, representing approximately 22% of the total dsRNA sequence, show no homology to organelle DNA. We have not been able to stably transmit the dsRNA to fertile lines of V. faba or any other plant species, using a variety of standard virological techniques. |
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| Keywords: | cytoplasmic male sterility Vicia faba double-stranded RNA mitochondrial DNA chloroplast DNA nuclear DNA |
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