1990
DOI: 10.1016/0014-5793(90)81449-x
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DNA polymerase activity of tomato fruit chromoplasts

Abstract: DNA polymerase activity was measured in chromoplasts of ripening tomato fruits. Plastids isolated from young leaves or mature red fruits showed similar DNA polymerase activities. The same enzyme species was present in either chloroplasts or chromoplasts as judged by PH and temperature profiles, sensitivities towards different inhibitors and relative molecular mass (M 1 88 kDa). The activities analyzed showed the typical behaviour of plastid‐type polymerases. The results presented here suggest that chromoplasts… Show more

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Cited by 4 publications
(5 citation statements)
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“…(b) ptDNA could be isolated from both chloro-and chromoplasts (19). The genome copy numbers were fairly the same in plastids from different developmental stages (29). (c) Our purified plastids contained large amounts of plastidspecific RNA (see below), whereas the RNA content of the broken plastid bands was negligible.…”
Section: Quantitation Of Plastid Transcription Activitiesmentioning
confidence: 90%
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“…(b) ptDNA could be isolated from both chloro-and chromoplasts (19). The genome copy numbers were fairly the same in plastids from different developmental stages (29). (c) Our purified plastids contained large amounts of plastidspecific RNA (see below), whereas the RNA content of the broken plastid bands was negligible.…”
Section: Quantitation Of Plastid Transcription Activitiesmentioning
confidence: 90%
“…4 and 21). The reasons for this impairment remain obscure, but they do not reflect limiting template availability because ptDNA levels and DNA polymerase activities are kept fairly constant in tomato leaves and fruits (11,29). Inhibition of RNA synthesis might then result from a number of factors, including decrease in the level or the specific activity of RNA polymerase(s) (11, see below) or topological changes that could affect overall template competence (32).…”
Section: Discussionmentioning
confidence: 99%
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