DNA distribution in chromosomes ofLathyrus species
Large changes in chromosome size and nuclear DNA amounts have occurred in the evolution of species within the genusLathyrus, which are also reflected in the amounts of heterochromatin and euchromatin and of repetitive and non-repetitive sequences. The distributions of nuclear DNA in the chromosome complements of 4Lathyrus species are compared. Although there is a doubling of the total amounts of nuclear DNA between highest and lowest of the four species the distribution among the chromosomes of each complement is approximately the same. Hence underlying these evolutionary changes there appear to be constraints upon changes in nuclear organization during speciation.
KeywordsLarge Change Evolutionary Change Chromosome Size Nuclear Organization 4Lathyrus Species
Unable to display preview. Download preview PDF.
- BrownD. D., WensinkP. C. & JordanE., 1971. Purification and some characteristies of 5S DNA from Xenopus lacvis. Proc. natn. Acad. Sci. U.S.A. 68: (12) 3175–3179.Google Scholar
- JonesK. W., 1973. In: New techniques in biophysies and cell biology-1. pp. 29–66 (H. R.Pain & B. J.Smith, eds.) Wiley, New York and London.Google Scholar
- Jones, N., 1967. Cytological studies in Secale and Allium. Thesis, University of Wales, Aberystwyth.Google Scholar
- McLeishJ. & SunderlandN., 1961. Measurement of deoxyribonucleic acid (DNA) in higher plants by feulgen photometry and chemical methods. Expl Cell Res. 24: 527–540.Google Scholar
- NarayanR. K. J. & ReesH., 1976. Nuclear DNA variation in Lathyrus. Chromosoma 54: 141–154.Google Scholar
- Narayan, R. K. J., 1982. Discontinuous DNA variation in the evolution of plant species. The genus Lathyrus. Evolution (in press).Google Scholar
- ReesH. & HazarikaM. H., 1969. Chromosome evolution in Lathyrus. Chromosomes Today 2: 158–165.Google Scholar
- ReesH. & NarayanR. K. J., 1977. Evolutionary DNA variation in Lathyrus. Chromosomes Today 6: 131–139.Google Scholar
- SennH., 1938. Experimental data for the revision of the genus Lathyrus. Am. J. Bot. 25: 67–78.Google Scholar
- StebbinsG. L., 1971. In: Chromosomal evolution in higher plants. Edward Arnold Ltd., London.Google Scholar
- TeohS. B. & ReesH., 1976. Nuclear DNA amounts in populations of Picea and Pinus species. Heredity 36: (1) 123–137.Google Scholar
- VosaC. G., 1974. The basic karyotype of rye (Secale cereale) analysed with Giemsa and fluorescence methods. Heredity 33: (3) 403–408.Google Scholar