Genetic diversity and molecular evolution of the internal transcribed spacer (ITSs) of nuclear ribosomal DNA in the Tunisian fig cultivars (Ficus carica L.; Moracea)

2013 ◽  
Vol 48 ◽  
pp. 20-33 ◽  
Author(s):  
Baraket Ghada ◽  
Ben Abdelkrim Ahmed ◽  
Mars Messaoud ◽  
Salhi-Hannachi Amel
Keyword(s):  
Genetic Diversity ◽  
Molecular Evolution ◽  
Ribosomal Dna ◽  
Internal Transcribed Spacer ◽  
Ficus Carica ◽  
Nuclear Ribosomal Dna

scholarly journals Genetic Diversity of Ephedra Plants in Mongolia Inferred from Internal Transcribed Spacer Sequence of Nuclear Ribosomal DNA

2011 ◽  
Vol 34 (5) ◽  
pp. 717-726 ◽  
Author(s):  
Yuki Kitani ◽  
Shu Zhu ◽  
Javzan Batkhuu ◽  
Chinbat Sanchir ◽  
Katsuko Komatsu
Keyword(s):  
Genetic Diversity ◽  
Ribosomal Dna ◽  
Internal Transcribed Spacer ◽  
Nuclear Ribosomal Dna

scholarly journals Multiple Origins and nrDNA Internal Transcribed Spacer Homeologue Evolution in the Glycine tomentella (Leguminosae) Allopolyploid Complex

Genetics ◽  
2004 ◽  
Vol 166 (2) ◽  
pp. 987-998 ◽  
Author(s):  
Jason T Rauscher ◽  
Jeff J Doyle ◽  
A H D Brown
Keyword(s):  
Molecular Evolution ◽  
Concerted Evolution ◽  
Internal Transcribed Spacer ◽  
Direct Sequencing ◽  
Nuclear Ribosomal Dna ◽  
Nucleolar Dominance ◽  
Future Studies ◽  
Complex Interactions ◽  
Multiple Origins ◽  
Glycine Tomentella

Abstract Despite the importance of polyploidy in the evolution of plants, patterns of molecular evolution and genomic interactions following polyploidy are not well understood. Nuclear ribosomal DNA is particularly complex with respect to these genomic interactions. The composition of nrDNA tandem arrays is influenced by intra- and interlocus concerted evolution and their expression is characterized by patterns such as nucleolar dominance. To understand these complex interactions it is important to study them in diverse natural polyploid systems. In this study we use direct sequencing to isolate and characterize nrDNA internal transcribed spacer (ITS) homeologues from multiple accessions of six different races in the Glycine tomentella allopolyploid complex. The results indicate that in most allopolyploid accessions both homeologous nrDNA repeats are present, but that there are significant biases in copy number toward one homeologue, possibly resulting from interlocus concerted evolution. The predominant homeologue often differs between races and between accessions within a race. A phylogenetic analysis of ITS sequences provides evidence for multiple origins in several of the polyploid races. This evidence for diverse patterns of nrDNA molecular evolution and multiple origins of polyploid races will provide a useful system for future studies of natural variation in patterns of nrDNA expression.

Internal transcribed spacer sequences of nuclear ribosomal DNA resolving complex taxonomic history in the genus Vicia L.

2014 ◽  
Vol 61 (5) ◽  
pp. 909-925 ◽  
Author(s):  
Behrouz Shiran ◽  
Soghra Kiani ◽  
Deepmala Sehgal ◽  
Akram Hafizi ◽  
Tanvir ul-Hassan ◽  
...  
Keyword(s):  
Ribosomal Dna ◽  
Internal Transcribed Spacer ◽  
Nuclear Ribosomal Dna ◽  
Taxonomic History ◽  
Internal Transcribed Spacer Sequences
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