Abstract
Different varieties of peas have different proportions of rDNA in their genomes; there is no obvious correlation between the proportions and seed or leaf size. The rDNA proportions in root tips, seedlings, leaves and in the cotyledon cells of high DNA content, were compared in four varieties. In three, there was no difference between tissues; the fourth showed an amplification of rRNA genes in the cells of high DNA content of the seed cotyledon, and also in the cells of young but not of older leaves. The fourth variety was the one that had the lowest proportion of rDNA of all those examined. Studies of the tissues of hybrids between genotypes with "low" and "high" proportions of rDNA showed that heterozygotes had the "high" value, showing again the occurrence of an amplification phenomenon.
Full Text
The Full Text of this article is available as a PDF (476.5 KB).
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Mohan J., Flavell R. B. Ribosomal RNA cistron multiplicity and nucleolar organizers in hexaploid wheat. Genetics. 1974 Jan;76(1):33–44. doi: 10.1093/genetics/76.1.33. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Parenti R., Guillé E., Grisvard J., Durante M., Giorgi L., Buiatti M. Transient DNA satellite in dedifferentiating pith tissue. Nat New Biol. 1973 Dec 19;246(155):237–239. doi: 10.1038/newbio246237a0. [DOI] [PubMed] [Google Scholar]