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- W1995708108 abstract "The duration of the DNA synthetic (S) period is shown to be relatively constant, thus independent of DNA content, in diploid-autotetraploid comparisons in several higher plants and among several species of the genus, Chrysanthemum. An 3H-, 14C-thymidine double-labeling technique was used for the measurements. The following mean S periods were obtained for diploid and autotetraploid plants respectively: 7.2 and 7.6 h for Lycopersicum esculentum, 10.7 and 10.4 h for Tradescantia paludosa, 7.9 and 7.9 h for Ornithogalum virens, 7.1 and 7.7 h for a Cymitbium in culture and 6.1 and 6.2 h from preliminary data for Ehrharta erecta. In the Chrysanthemum species, the mean S periods were 5.9 h in C. corymbosum 2N = 18, 4.8 in C. yezoense 2N = 56, 5.1 in C. arcticum 2N = 64 and 6.3 h in C. lacustre 2N = 198. These results point to a linear increase in the average nuclear rate of DNA synthesis with increasing ploidy level and this is further supported by findings of progressively increased grain counts over 2N, 3N and 4N Tulbaghia violacea nuclei. Replication pattern studies by others have noted a specific, temporal pattern of DNA synthesis throughout the chromosomal complement; thus, one would not expect an increased S period duration to result from an increase in ploidy. The results presented here are not in agreement with those of Van't Hof which indicated a direct relationship between DNA content and S period duration in a number of unrelated higher plants; however, differences in experimental conditions may account in part for the discrepancies." @default.
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- W1995708108 date "1968-10-01" @default.
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- W1995708108 title "Evidence for a constancy of the DNA synthetic period between diploid-polyploid groups in plants" @default.
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- W1995708108 doi "https://doi.org/10.1016/0014-4827(68)90362-5" @default.
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