Summary
Double-stranded RNA (dsRNA) was isolated from rice Oryza sativa ssp. japonica, but not from other subspecies. The dsRNA has been found in all of the examined cytoplasmic male-sterile (CMS) lines of BT (Chinsurah Boro II)-type rice, but was not detected in their companionate maintainer lines. It is uniquely and positivley correlated with the CMS trait in BT-type rice. Recently, the dsRNA was also found in a nuclear malesterile (NMS) rice, Nongken 58s, but was not found in its normal Nongken 58. The molecular weight of this dsRNA was estimated to be about 18 kb. Electron microscopic analysis reveals that it is linear snapped. The double strandedness of the RNA molecules was characterized by CF-11 cellulose column chromatography and nuclease treatments. It bound to CF-11 cellulose in the presence of 15% ethanol. It was sensitive to RNase A at low salt concentrations, but insensitive to DNase I, SI nuclease, and RNase A at high salt concentrations. The dsRNA was detected in both mitochondrial and cytoplasmic fractions. Dot-blot hybridization reveals that there is no sequence homology between this dsRNA and mtDNA, but there is homology between this dsRNA and nuclear genomic DNA. We have not been able to transmit this dsRNA to fertile rice.
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Wang, B., Li, Y.N., Zhang, X.W. et al. Double-stranded RNA and male sterility in rice. Theoret. Appl. Genetics 79, 556–560 (1990). https://doi.org/10.1007/BF00226167
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DOI: https://doi.org/10.1007/BF00226167