Summary
Highly repeated nuclear DNA sequences from suspension cultured cells of Oryza sativa L. cv. ‘Roncarolo’ have been cloned in pBR322. Ten clones with specific digestion patterns have been randomly selected. Nine sequences appear to be organized in a clustered tandem array while one is interpersed in the rice genome. The clones have been used to gather information on: (a) their modulation in cultured cells as compared to whole plant and (b) their distribution in different rice cultivars belonging to the Japonica or Indica subspecies of Oryza sativa L. Hybridization with nuclear DNA isolated either from suspension or from seedlings of the ‘Roncarolo’ cultivar revealed extensive quantitative variations, with most cloned sequences showing amplification (up to 75-fold) in cultured cells. Hybridization with nuclear DNA isolated from seedlings or suspension cultured cells from different cultivars belonging to the Japonica or to the Indica sub-species of O. sativa have shown that (a) amplification also occurs in a similar pattern in the case of DNA from the other tested suspension cultured cell types but not in the case of DNA from seedlings; (b) in some cases the tested sequences show minor but significant variations in different rice accessions.
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Communicated by F.Salamini
On leave from China National Rice Research Institute, Hangzhou, China
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Zheng, K.L., Castiglione, S., Biasini, M.G. et al. Nuclear DNA amplification in cultured cells of Oryza sativa L.. Theoret. Appl. Genetics 74, 65–70 (1987). https://doi.org/10.1007/BF00290085
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DOI: https://doi.org/10.1007/BF00290085