Open AccessDistribution of 5 S and 35 S rRNA gene sites in 34 C henopodium species ( A maranthaceae)
Author(s) -
Kolano Bozena,
Tomczak Hanna,
Molewska Renata,
Jellen Eric N.,
Maluszynska Jolanta
Publication year - 2012
Publication title -
botanical journal of the linnean society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.872
H-Index - 68
eISSN - 1095-8339
pISSN - 0024-4074
DOI - 10.1111/j.1095-8339.2012.01286.x
Subject(s) - biology , polyploid , chenopodium , ploidy , locus (genetics) , chromosome , karyotype , genetics , botany , ribosomal rna , ribosomal dna , gene , phylogenetics , weed
Studies on C henopodium chromosomes are scarce and restricted mainly to chromosome number estimation. To extend our knowledge on karyotype structure of the genus, the organization of 5 S and 35 S rRNA genes in C henopodium chromosomes was studied. The rDNA sites were predominantly located at chromosomal termini, except in a few species where 5 S rDNA sites were interstitial. The majority of the diploid species possessed one pair each of 35 S and 5 S rDNA sites located on separate chromosomes. Slightly higher diversity in rDNA site number was observed in polyploid accessions. One or two pairs of 35 S rDNA sites were observed in tetraploids and hexaploids. Tetraploid species had two, four or six sites and hexaploid species had six or eight sites of 5 S rDNA , respectively. These data indicate that, in the evolution of some polyploid species, there has been a tendency to reduce the number of rDNA sites. Additionally, polymorphism in rDNA site number was observed. Possible mechanisms of rDNA locus evolution are discussed. © 2012 The Linnean Society of L ondon, Botanical Journal of the Linnean Society, 2012, ••, ••–••.