Differences in the mosaic plants occurence frequency between the Nu5 and Nu6 lines of transgenic tobacco (Nicotiana tabacum) plants remained irrespective of the nptII marker gene allelic state. nptII gene transition from the hemizygous state (T3) to the homozygous one (T4) was accompanied by an increase in the frequency of mosaics in both lines. Transition from the homozygous state (T4) into the hemizygous one (F1) resulted in a further increase in the frequency of mosaic plants in the Nu5 line, whereas this parameter remained at a high level in the Nu6 line. pMAS promoter hypermethylation in plants of both lines, as well as differences in the 5′-part truncated nptII gene copy cytosin methylation level between the Nu5 and Nu6 lines, pointed to nptII gene mosaic expression epigenetic regulation.
Russian Journal of Genetics – Springer Journals
Published: Nov 17, 2012
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