Plant Systematics and Evolution

, Volume 160, Issue 1–2, pp 91–104 | Cite as

DNA sequence analyses of the ribosomal spacer regions in theTriticeae

  • C. L. McIntyre
  • B. C. Clarke
  • R. Appels
Article
Received:

Abstract

Two regions of the ribosomal DNA (rDNA) were sequenced from a range of species from the tribeTriticeae. One region, the central spacer, was found to be more divergent in sequence than the other, the 18 S-spacer junction. Both regions contained sequences 20–30 bp long which were more highly conserved than the remainder of the region and their possible significance in rDNA expression is discussed. Phenetic relationships based on the sequence data were generally consistent with the relationships based on other criteria. Species possessing the S, E, J1J2, D, and B genomes clustered together, with the H genome species being the most distinct of those examined. The R, P, and V genome species occupy an intermediate position in the overall pattern of relationships. Some relationships differed in detail from those established by other parameters, for example the position of the N genome species, and explanations for discrepancies of this type are discussed.

Key words

Angiosperms Poaceae Triticeae Ribosomal DNA spacer regions phenetic and molecular relationships 
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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • C. L. McIntyre
    • 1
  • B. C. Clarke
    • 1
  • R. Appels
    • 1
  1. 1.Division of Plant IndustryCSIROCanberraAustralia

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