Abstract Twelve hyper-? carotene-producing strains of algae assigned to the genus Dunaliella salina have been isolated from various hypersaline environments in Israel, South Africa, Namibia and Spain. Intron-sizing SSU rDNA phylogenetic analysis these isolates were undertaken using four commonly employed markers for genotyping, LSU rDNA, ITS, rbc L tuf A their application study evaluated. Novel...

The ribosomal DNA (rDNA) in Tetrahymena thermophila is a 21-kilobase-pair palindromic DNA molecule that replicates autonomously in the macronucleus and is maintained at the level of about 10,000 copies per macronucleus. The rDNA of inbred strain C3 outreplicates the rDNA of inbred strain B in most B/C3 heterozygous macronuclei, generating macronuclei containing exclusively C3 rDNA sequences. In...

In the present study, a phylogenetic analysis was undertaken based on the internal transcribed spacer (ITS) rDNA and partial β-tubulin gene sequence of the Ganoderma species. The size of the ITS rDNA regions from different Ganoderma species varied from 625 to 673 bp, and those of the partial β-tubulin gene sequence were 419 bp. Based on the results, a phylogenetic tree was prepared which reveal...

Rhizopus oryzae is an important organism for its production of organic acids such as lactic acid, fumaric acid, etc. To date, there were no easy methods to classify strains according to their acid production. The sequences of the ribosomal RNA-encoding DNA (rDNA) internal transcribed spacer (ITS) region of 64 strains of R. oryzae were analyzed and found to conserve mutations correspond to acid ...

Aim. 5S ribosomal DNA (5S rDNA) represents a universal model for studying the evolution of repeated sequences in eukaryotic organisms. Taking into account that this region genome still remains almost undescribed species family Sapindaceae, we investigated molecular organization unit rDNA member family, Litchi chinensis. Methods. PCR amplification, cloning and sequencing rDNA. Results. It was fo...

31 We examined chromosomal distribution of major ribosomal DNAs (rDNAs), clustered in the nucleolar 32 organizer regions (NORs), in 18 species of moths and butterflies using fluorescence in situ 33 hybridization (FISH) with a codling moth (Cydia pomonella) 18S rDNA probe. Most species showed 34 one or two rDNA clusters in their haploid karyotype but exceptions with four to eleven clusters also ...