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Fragments of plastid DNA in the nuclear genome of tomato: prevalence, chromosomal location, and possible mechanism of integration

✍ Scribed by Pichersky, Eran ;Logsdon, John M. ;McGrath, J. Mitchell ;Stasys, Robert A.

Publisher: Springer
Year: 1991
Tongue: English
Weight: 807 KB
Volume: 225
Category: Article
ISSN: 0026-8925
DOI: 10.1007/bf00261687

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✦ Synopsis

We have undertaken a systematic search for plastid DNA sequences integrated in the tomato nuclear genome, using heterologous probes taken from intervals of a plastid DNA region spanning 58 kb. A total of two short integrates (202 and 141 nucleotides) were isolated and mapped to chromosomes 9 and 5, respectively. The nucleotide sequence of the integrates and that of the flanking regions were determined. The integration sites contain direct repeat elements similar in position (but not in length or sequence) to the direct repeats previously observed with another plastid integrate in the tomato nuclear genome. Based on these results, a model for the process of movement and integration of plastid sequences into the nuclear genome is discussed.

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