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Molecular organisation of the plant genome: Its relation to structure, recombination and evolution of chromosomes

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Abstract

Large scale changes in nuclear DNA amount accompany the evolution of species of higher plants. Much of the nuclear DNA accrued during the evolution of species does not encode genetic information and is selectively neutral. Nonetheless, the pattern of distribution of the excess DNA within and between chromosome complements suggests that there are rigid constraints underlying evolutionary changes in genome organisation.

A five-fold increase in the amount of nuclear DNA has occurred in the evolution ofLathyrus species. Not withstanding this massive DNA variation, species show consistently similar patterns in base sequence proliferation, divergence and DNA distribution within and between chromosome complements. Within chromosome complements, the excess DNA is distributed evenly in all chromosomes irrespective of the large differences in chromosome size and, between complements, DNA distribution is discontinuous; species cluster into DNA groups with remarkably regular intervals. Similar constraints govern the frequency and distribution of chiasmata in the chromosome complements. Between species chiasma frequency and nuclear DNA amounts are not correlated but within complements it is positively correlated with the amount of DNA contained in each chromosome.

It is shown that constraints upon evolutionary changes in genome organisation could restrict or predetermine the outcome in chromosome evolution.

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  1. Department of Agricultural Sciences, University College of Wales, Aberystwyth, Wales, UK

    R. K. J. Narayan

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Narayan, R.K.J. Molecular organisation of the plant genome: Its relation to structure, recombination and evolution of chromosomes. J. Genet. 70, 43–61 (1991). https://doi.org/10.1007/BF02923577

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