Abstract
Ripening of tomato fruits involves differentiation of chloroplasts into non-photosynthetic chromoplasts. Plastid DNAs isolated either from green leaf chloroplasts or mature red fruit chromoplasts were compared by restriction endonuclease and DNA/DNA hybridization analyses. The same restriction and gene maps were obtained for both types of DNAs, illustrating the lack of major recombinational events during chromoplast formation. Several enzymes were used that discriminate the presence of methylated bases in their target sequences (Pst I, Pvu II, Sal I, Mbo I/Sau 3AI, Msp I/Hpa II, Bst NI/Eco RII). Plastid DNA fragments generated by these enzymes were hybridized against DNA probes encompassing about 85% of the tobacco chloroplast genome. These probes represented genes that follow very different expression behaviors in response to plastid development. Extensive restriction and hybridization analyses failed to reveal any difference between the chloroplast and chromoplast genomes, indicating that no developmentally related DNA methylation was detected by these methods. The results presented here do not support the hypothesis that selective DNA methylation of the chromoplast genome might play a major role in the transcriptional control of gene expression in these non-photosynthetic plastids.
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Marano, M.R., Carrillo, N. Chromoplast formation during tomato fruit ripening. No evidence for plastid DNA methylation. Plant Mol Biol 16, 11–19 (1991). https://doi.org/10.1007/BF00017913
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DOI: https://doi.org/10.1007/BF00017913