Abstract
Twelve Nicotiana species, and haploids obtained by anther culture from three of these species, were assayed for the proportion of DNA complementary to ribosomal RNA. No variation was observed in the proportion of DNA coding for ribosomal RNA between diploid and haploid plants within a given species. Wide variation was observed in this proportion between the species with values ranging between 0.068% and 0.43% of the total DNA. No relationship between the proportion of DNA complementary to rRNA and the chromosome number of the species was observed.
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