Abstract
Wide compatibility varieties (WCVs) are a special class of rice (Oryza sativa L.) germplasm that produces hybrids with normal pollen and spikelet fertility when crossed with both indica and japonica subspecies. The wide compatibility gene S5 n has been used extensively in intersubspecific hybrid breeding programs. We previously mapped the S5 locus to a 2.2-cM genomic region between RM253 and R2349 on chromosome 6, using a population of 356 F1 plants derived from the three-way cross 02428/Nan**g11//Balilla. In this study, a chromosome walking strategy was employed to construct a physical map covering this genomic region using these two closest markers as the starting points. A physical map consisting of six overlap** BAC clones was formed, spanning a genomic region of 540-kb in length. By analyzing recombination events from a population of 8,000 F1 plants derived from a three-way cross based on near isogenic lines of the S5 locus, the S5 locus was localized to a DNA fragment of 40-kb in length, flanked by two shotgun subclones, 7B1 and 15D2. Sequence analysis of this fragment predicted five open reading frames, encoding xyloglucan fucosyltransferases, dnak-type molecular chaperone BiP, a putative eukaryotic aspartyl protease, and a hypothetical protein. This result will be very useful in molecular cloning of the S5 n allele and marker-assisted transferring of the wide compatibility gene in rice breeding programs.
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Acknowledgments
This research was supported by grants from the National Program of Research and Development of Transgenic Plants, the National Special Key Project of Functional Genomics and Biochips, the National Natural Science Foundation of China, and an Award to Elite Young Teacher at Universities of China (K Liu).
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Qiu, S.Q., Liu, K., Jiang, J.X. et al. Delimitation of the rice wide compatibility gene S5 n to a 40-kb DNA fragment. Theor Appl Genet 111, 1080–1086 (2005). https://doi.org/10.1007/s00122-005-0033-0
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DOI: https://doi.org/10.1007/s00122-005-0033-0