NDLI: Heterochromatin characterization through differential fluorophore binding pattern in some species of Vigna Savi

Content Provider	Springer Nature Link
Author	Shamurailatpam, Anju Madhavan, Latha Yadav, Shrirang Ramachandra Bhat, Kangila Venkatraman Rao, Satyawada Rama
Copyright Year	2014
Abstract	Heterochromatin regions are the most intensively studied and best known chromosome markers in plants. In Vigna species, blocks of constitutive heterochromatin were found either in the terminal or interstitial region of the chromosomes. The number and distribution of CMA+ and DAPI+ binding sites exhibit high chromosomal variability with characteristic unique banding patterns in all the eight taxa. A predominant feature was observed, i.e., most of the CMA+ binding sites were in the terminal region of the short arm of some chromosomes while DAPI+ binding sites were found mostly in the intercalary region of the chromosomes. The higher divergence in the heterochromatin blocks, as revealed by chromomycin A3 (CMA) binding pattern, in a few taxa, viz. Vigna glabrescens, Vigna khandalensis, and Vigna mungo, suggests that the processes of divergent evolution of repetitive sequences in genomic DNA involve a guanine-cytosine (GC)-rich region. On the contrary, Vigna dalzelliana had shown a prominent adenine-thymine (AT)-rich repetitive DNA sequence in terminal regions in the short arm of chromosomes while Vigna umbellata had shown in interstitial regions. The presence of prominent heterochromatic-rich regions, either GC- or AT-rich regions, does facilitate the rate of chromosomal rearrangements leading to restructuring of the karyotypes and thereby helping the species to attempt structural alterations as means of speciation.
Starting Page	629
Ending Page	635
Page Count	7
File Format	PDF
ISSN	0033183X
Journal	Protoplasma
Volume Number	252
Issue Number	2
e-ISSN	16156102
Language	English
Publisher	Springer Vienna
Publisher Date	2014-10-11
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Euchromatin Fluorochrome Heterochromatin Karyotypes Vigna Cell Biology Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine

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