Nuclear Variation between Diploid Angiosperms

Rees, H.; Cameron, F M; Hazarika, Manjil; Jones, Gareth R.

doi:10.1038/211828a0

Cited by 105 publications

(40 citation statements)

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“…A similar difference has also been found in Vicia, a closely related genus (Rees et al 1966). The evolution of the Lathyrus species studied was accompanied by a decrease in chromosome size and that L. crassipes is a derived species (klamt and Schifino-Wittmann 2000).…”

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confidence: 74%

Genetic Variability in Lathyrus spp. as Revealed by Karyotype Analysis

et al. 2009

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SummaryThe genetic variability based on karyotype formula was studied for 40 accessions of genus Lathyrus. All accessions have 2nϭ14 chromosomes. Karyotype formula has a great uniformity among accessions of each species, suggesting interaspecific stability in Lathyrus species. Our data allowed the differentiation of several accessions among sections Lathyrus, Linearicarpus and Clymenum in number of m chromosome. The variation among section Lathyrus supports that section Lathyrus is not fully constant as has been postulated. Satellites were detected in a pair of chromosome in L. sativus (TUN and AFG). On the otherhand, B-chromosome was detected in L. sativus (USSR, BAN, CAN, and PAK) L. gorgoni (JOR) and L. annus (SYR). This finding may be due to the variation in DNA amount by increase in the non-repetitive sequence. The variation in size of chromosomes of the members of Lathyrus is associated with the evolution in the genus.

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confidence: 74%

Genetic Variability in Lathyrus spp. as Revealed by Karyotype Analysis

et al. 2009

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“…The distinction matters not only in respect of the origin of change but also with respect to its genetic consequences. Lengthwise duplication of parts involves duplication of some loci, whereas variation in strandedness or polynemy involves duplication or replication of all loci (see Rees et al, 1966).…”

Section: Results (A) Nuclear Dna Variation In the Six Lolium Speciesmentioning

confidence: 99%

“…If they are valid we should expect, for one thing, the increased nuclear DNA in many, even if not all (cf. Rees et al, 1966), inbreeding species as compared with related outbreeders.…”

Section: Discussionmentioning

confidence: 99%

“…There is evidence also of a qualitative variation of a different kind, namely in the order of bases in the nucleic acid, RNA in this case, of virus strains of different genotype (Reddi, Quantitative variation in nuclear DNA is of course common in cases of numerical chromosome change such as polyploidy. It is found also, however, even between diploid species of the same genus (Sunderland and McLeish, 1961;McLeish, 1962;Rees et al, 1966).…”

Section: Introductionmentioning

confidence: 99%

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Chromosome evolution in Lolium

Rees

Jones

1967

Heredity

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“…In recent years, DNA content per cell, per nucleus or per chromosome has been examined in many species, revealing that there exists a considerable variation of DNA content within a family, genus or even species (Rees et al 1966;Chooi 1971;Bennett 1972;Price et al 1973 ;Furuta et al 1974;Price and Bachmann 1975). Though the mechanism of change in DNA content is not fully understood, the evolutionary significance of the change in DNA amount was pointed out by some investigators.…”

Section: Introductionmentioning

confidence: 99%

Variation of DNA content in Asian rice.

Nagato

Yamamoto

Yamashita

1981

The Japanese journal of genetics

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We examined the variation of DNA content in Asian rice; wild species, Oryza perennis, cultivated species, 0. sativa, and the wild-cultivated intermediate Jeypore strains. DNA contents were estimated Feulgen microspectrophotometrically and chemically. In addition, nuclear volume was recorded which was known to correlate positively with DNA content. There existed strong correlations between the estimates obtained by the above three methods, showing a reliability of the present measurements.In each species, considerably wide variation of DNA content was detected which was not due to random error of the measurements.Though variations among strains overlapped between 0. perennis, Jeypore strains and 0. sativa, they showed an evolutionary tendency. Oryza perennis strains generally had the higher DNA contents than 0. sativa strains and the intermediate Jeypore strains had the intermediate values. Therefore, we consider that DNA content of Asian rice has decreased during evolution (domestication). In Asian rice, reduction of DNA content is parallel to the reduction of the globular period of embryo which means the decrease of developmental instability. The reductional nature of DNA content during evolution is also observed in the process of speciation of other species and as well in the evolution of monocotyledons at the order level. This suggests that many evolutionary changes in plants, if not all, are connected with the decrease of DNA content.

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Nuclear Variation between Diploid Angiosperms

Cited by 105 publications

References 3 publications

Genetic Variability in Lathyrus spp. as Revealed by Karyotype Analysis

Genetic Variability in Lathyrus spp. as Revealed by Karyotype Analysis

Chromosome evolution in Lolium

Variation of DNA content in Asian rice.

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