PMID- 11302839
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20121002
LR  - 20110615
IS  - 0002-9122 (Print)
IS  - 0002-9122 (Linking)
VI  - 88
IP  - 4
DP  - 2001 Apr
TI  - Genomic and genetic relationships among species of Leymus (Poaceae: Triticeae) 
      inferred from 18S-26S ribosomal genes.
PG  - 553-9
AB  - The 18S-26S ribosomal genes in three closely related species of Leymus (Poaceae: 
      Triticeae) were examined using fluorescence in situ hybridization (FISH) and 
      restriction fragment length polymorphism (RFLP). Both approaches revealed a close 
      relationship between L. arenarius (8x = 56, northern European) and L. racemosus 
      (4x = 28, central Eurasian), whereas L. mollis (4x = 28, northern 
      American/Pacific) was distinct. Each species had three homologous pairs of major 
      rDNA loci: a1, a2, and a3 for L. arenarius; m1, m2, and m3 for L. mollis; and r1, 
      r2, and r3 for L. racemosus. Leymus arenarius had in addition three minor loci, 
      a4, a5, and a6. The major loci of L. arenarius and L. racemosus were identical, 
      indicating that the former species could have originated from the latter, via 
      interspecific hybridization and/or polyploidy. The rDNA-RFLPs further indicated 
      relationships of these species to other species of Leymus (L. karellini, 8x = 56 
      and L. angustus, 12x = 84) and Psathyrostachys (P. fragilis, P. huashanica, P. 
      juncea, and P. lanuginosa, which are all diploids). A phenogram constructed from 
      20 BamHI, EcoRI, and DraI rDNA fragments revealed closer relationship between the 
      two genera, Leymus and Psathyrostachys, than that among species within a genus.
FAU - Anamthawat-Jonsson, K
AU  - Anamthawat-Jonsson K
AD  - Department of Biology, University of Iceland, Grensasvegi 12, Reykjavik 108, 
      Iceland.
FAU - Bodvarsdottir, S K
AU  - Bodvarsdottir SK
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Am J Bot
JT  - American journal of botany
JID - 0370467
EDAT- 2001/04/17 10:00
MHDA- 2001/04/17 10:01
CRDT- 2001/04/17 10:00
PHST- 2001/04/17 10:00 [pubmed]
PHST- 2001/04/17 10:01 [medline]
PHST- 2001/04/17 10:00 [entrez]
AID - 88/4/553 [pii]
PST - ppublish
SO  - Am J Bot. 2001 Apr;88(4):553-9.