Chromosomal DNA variation in Cucumis

Variation in nuclear DNA amounts found in different species of Cucumis was surveyed. The DNA amounts varied from 1.373 to 2.483 pg in diploids and from 2.846 to 3.886 pg in tetraploids. DNA amount was not correlated with chromosome number and periodicity. Tetraploids were found to have double the qu...

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Bibliographic Details
Published in:Theoretical and applied genetics 1985-03, Vol.69 (5/6), p.497-502
Main Authors: Ramachandran, C, Narayan, R.K.J
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
chromosomes
Classical and quantitative genetics. Population genetics. Molecular genetics
Cucumis
DNA
Fundamental and applied biological sciences. Psychology
Generalities. Genetics. Plant material
Genes. Genome
genetic variation
Genetics and breeding of economic plants
Molecular and cellular biology
Molecular genetics
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Summary:Variation in nuclear DNA amounts found in different species of Cucumis was surveyed. The DNA amounts varied from 1.373 to 2.483 pg in diploids and from 2.846 to 3.886 pg in tetraploids. DNA amount was not correlated with chromosome number and periodicity. Tetraploids were found to have double the quantity of nuclear DNA of diploids. A positive linear relationship was established between the nuclear DNA amounts and volume of chromosomes. The botanical varieties within a particular species do not differ significantly for 2C DNA amounts. A comparison of the distribution of DNA amounts among different chromosomes of haploid complement in different species revealed that the quantitative DNA changes associated with speciation affected all chromosomes. DNA changes were not however, of the same magnitude in all chromosomes of the complement. Speciation in Cucumis thus seems to have occurred through amplification or diminution of DNA proportionate to the size of chromosomes. The relationship between the basic numbers, x=7 and x=12, will have to be considered relative to the high DNA amount noticed in some species with x=12.
ISSN:0040-5752
1432-2242
DOI:10.1007/BF00251092