Contrasting patterns of the 5S and 45S rDNA evolutions in the Byblis liniflora complex (Byblidaceae).

Journal of Plant Research
Kenji FukushimaYoshikazu Hoshi

Abstract

To clarify the evolutionary dynamics of ribosomal RNA genes (rDNAs) in the Byblis liniflora complex (Byblidaceae), we investigated the 5S and 45S rDNA genes through (1) chromosomal physical mapping by fluorescence in situ hybridization (FISH) and (2) phylogenetic analyses using the nontranscribed spacer of 5S rDNA (5S-NTS) and the internal transcribed spacer of 45S rDNA (ITS). In addition, we performed phylogenetic analyses based on rbcL and trnK intron. The complex was divided into 2 clades: B. aquatica-B. filifolia and B. guehoi-B. liniflora-B. rorida. Although members of the complex had conservative symmetric karyotypes, they were clearly differentiated on chromosomal rDNA distribution patterns. The sequence data indicated that ITS was almost homogeneous in all taxa in which two or four 45S rDNA arrays were frequently found at distal regions of chromosomes in the somatic karyotype. ITS homogenization could have been prompted by relatively distal 45S rDNA positions. In contrast, 2-12 5S rDNA arrays were mapped onto proximal/interstitial regions of chromosomes, and some paralogous 5S-NTS were found in the genomes harboring 4 or more arrays. 5S-NTS sequence type-specific FISH analysis showed sequence heterogeneity within and be...Continue Reading

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Citations

Nov 28, 2012·BMC Evolutionary Biology·Fernando Roa, Marcelo Guerra
Aug 28, 2015·Comparative Cytogenetics·Aryane Campos ReisSaulo Marçal de Sousa
Dec 13, 2016·The Plant Journal : for Cell and Molecular Biology·Sònia GarciaTeresa Garnatje
Nov 22, 2016·PloS One·Tae-Soo JangHanna Weiss-Schneeweiss
Jun 13, 2014·American Journal of Botany·Aryane C ReisLyderson F Viccini
Jan 13, 2021·Annual Review of Plant Biology·Rainer Hedrich, Kenji Fukushima
Jun 22, 2021·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Manman QuYonghua Han

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Datasets Mentioned

BETA
GU810492

Methods Mentioned

BETA
PCR
Fluorescence

Software Mentioned

MrModeltest
MEGA4
PhyML
MrBayes
Clustal X
rorida

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