Physical localization and probable transcriptional activity of 18S-5.8S-26S rRNA gene loci in some Asiatic Cymbidiums (Orchidaceae) from north-east India

Santosh Kumar Sharma, Poonam Mehra, Jyoti Kumari, Sundip Kumar, Suman Kumaria, Pramod Tandon, Satyawada Rama Rao

Research output: Contribution to journalArticlepeer-review

Abstract

Fluorescence in situ hybridization based physical localization of 45S ribosomal DNA in eight horticulturally important species of Cymbidium (Orchidaceae) from north-east India (South-East Asia) has been carried for the first time. Observations revealed only one pair of chromosomes had NOR loci. Three, out of eight Cymbidiums showed decondensed, dispersed, extended form of hybridization signals of rDNA as dots of fluorescence (transcriptionally active), where as the rest of the Cymbidiums revealed condensed (non-active) forms, hence demonstrated the heteromorphism in size, intensities and their appurtenance which may be under epigenetic control. Except for the ribosomal genes, no other active genes have been reported to reside within the nucleoli. Such observations provide useful chromosome landmarks and provide valuable evidence about the genome evolution, speciation and ploidy both at molecular and chromosomal levels which is more or less highly ambiguous in family Orchidaceae.

Original languageEnglish
Pages (from-to)362-366
Number of pages5
JournalGene
Volume499
Issue number2
DOIs
Publication statusPublished - 15 May 2012
Externally publishedYes

Keywords

  • Cymbidium
  • FISH
  • Orchidaceae
  • RDNA
  • Transcriptionally active

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