Journal ArticleDOI
Chromosome banding in evolutionary plant cytogenetics
U C Lavania,A K Sharma +1 more
- Vol. 92, Iss: 1, pp 51-79
TLDR
The introduction of chromosome banding techniques for linear differentiation of chromosomes have allowed the identification of the heterochromatic segments on the chromosomes, which have been utilized for inter- and intra-species comparisons and the probable phylogenetic relationships in various plant taxa from Gymnosperms, Angiosperms have been suggested.Abstract:
The introduction of chromosome banding techniques for linear differentiation of chromosomes have allowed the identification of the heterochromatic segments on the chromosomes. These heterochromatic segments are primarily composed of repetitive DNA, which are discernible in the form of dark staining regions by Giemsa C band staining or exhibit enhanced or reduced fluorescent bands by Q banding techniques depending upon the particular type of DNA repetition. The analyses of banding patterns have allowed in plants, the identification of chromosomes or parts of chromosomes, which have been utilized for inter- and intra-species comparisons. Based on the information of banding patterns, amount and distribution of heterochromatic segments, coupled with karyotypic features and morphological similarities; the probable phylogenetic relationships in various plant taxa from Gymnosperms, Angiosperms (both dicots and monocots) have been suggested. The information on heterochromatin recognition have also been utilized in suggesting probable ancestry of polyploids and the trend of evolution in varietal differentiation and speciation. Analysing the data, a probable phylogenetic significance and the direction of change in heterochromatin evolution in plants is suggested.read more
Citations
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Evidence for transposition of dispersed repetitive DNA families in yeast [Saccharomyces cerevisiae]
J.R. Cameron,E.Y. Loh,R.W. Davis +2 more
TL;DR: In this paper, Dispersed repetitive DNA sequences from yeast (Saccharomyces cerevisiae) nuclear DNA have been isolated as molecular hybrids in lambdagt and showed marked alterations in the size of the restriction fragments containing these repetitive DNAs.
Journal ArticleDOI
Chromosome banding patterns in the annual species of Cicer.
TL;DR: There seemed to be a trend for reduction in C-heterochromatin content in the course of evolution in Cicer, and C-banding patterns allowed for chromosome identification and matching pairs of homologues in all species analyzed.
Book ChapterDOI
Some aspects of plant karyology and karyosystematics.
TL;DR: The significance of the 4C value (where C is the amount of DNA in the unreplicated haploid genome) in angiosperm plants is discussed and some rules governing the distribution of DNA amount among different plant taxa are postulated.
Journal ArticleDOI
Chromosome change and karyotype differentiation–implications in speciation and plant systematics
TL;DR: In this article, a detailed account of experimental parameters useful in chromosome identification and evaluation of karyotype asymmetry is furnished citing suitable examples, and special emphasis is given to the quantitative parameter of "chromosome dispersion index" that promises phylogenetic differentiation of closely related karyotypes.
Journal ArticleDOI
Interphase nuclear structure and heterochromatin in Cicer species
G Kabir,G Kabir,R. M. Singh +2 more
TL;DR: Interphase nuclear organization was studied in six species of Cicer and all the species showed chromocentric nuclear organization in both meristematic and differentiated cells instead of reticulate organization, which can be considered as primitive of the six Cicer species.
References
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Journal ArticleDOI
Giemsa C-banding and the evolution of wheat.
Bikram S. Gill,Gordon Kimber +1 more
TL;DR: Comparisons of the C-banding of the diploid species T. monococcum, T. speltoides, and T. tauschii with that of the A, B, and D genomes, respectively, in hexaploid wheat corroborate that T. Speltoide could not be the donor of the B genome to wheat and that T, monoc occum and T, tuschii are the probable donors of the D genomes.
Journal ArticleDOI
C-banded karyotypes in theScilla hohenackeri group,S. persica, andPuschkinia (Liliaceae)
Johann Greilhuber,Franz Speta +1 more
TL;DR: Quantitatively evaluated C-banding karyograms and further observations on karyotype structure are presented for Scilla persica, 7 species of the Scilla hohenackeri group, and Puschkinia scilloides, finding very diverse and species-specific banding patterns are found.
Journal ArticleDOI
Darlington, C. D.: Chromosome Botany and the Origins of Cultivated Plants. 2. Aufl. George Allen & Unwin Ltd., London 1963. XVI + 231 S., Preis 35,- s
Journal ArticleDOI
Evolution of DNA content in higher plants
TL;DR: A chronology of key events, events, and researchers’ observations that led to the establishment of the “six letters” structure of DNA in 1953 and its replacement by the four “letter T”s since then.