Abstract
Closely-located transposable elements (TEs) have been known to induce chromosomal breakage and rearrangements via alternative transposition. To study genome rearrangements in rice, an Ac/Ds system has been employed. This system comprises an immobile Ac element expressed under the control of CaMV 35S promoter, and a modified Ds element. A starter line carried Ac and a single copy of Ds at the OsRLG5 (Oryza sativa receptor-like gene 5). To enhance the transpositional activity, seed-derived calli were cultured and regenerated into plants. Among 270 lines regenerated from the starter, one line was selected that contained a pair of inversely-oriented Ds elements at the OsRLG5 (Oryza sativa receptor-like gene 5). The selected line was again subjected to tissue culture to obtain a regenerant population. Among 300 regenerated plants, 107 (36 %) contained chromosomal rearrangements including deletions, duplications, and inversions of various sizes. From 34 plants, transposition mechanisms leading to such genomic rearrangements were analyzed. The rearrangements were induced by sister chromatid transposition (SCT), homologous recombination (HR), and single chromatid transposition (SLCT). Among them, 22 events (65 %) were found to be transmitted to the next generation. These results demonstrate a great potential of tissue culture regeneration and the Ac/Ds system in understanding alternative transposition mechanisms and in developing chromosome engineering in plants.
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Acknowledgments
This work was supported by grants from the Next-Generation BioGreen 21 Program (PJ01103901 and PJ01114601), the Rural Development Administration, Republic of Korea; by the USDA National Institute of Food and Agriculture Hatch project number IOW05282; and by State of Iowa funds.
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Xuan, Y.H., Peterson, T., Han, Cd. (2016). Generation and Analysis of Transposon Ac/Ds-Induced Chromosomal Rearrangements in Rice Plants. In: Murata, M. (eds) Chromosome and Genomic Engineering in Plants. Methods in Molecular Biology, vol 1469. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-4931-1_4
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DOI: https://doi.org/10.1007/978-1-4939-4931-1_4
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