Plant Systematics and Evolution

, Volume 249, Issue 3, pp 139–149

Chromosome evolution of Pennisetum species (Poaceae): implications of ITS phylogeny

  • E. Martel
  • V. Poncet
  • F. Lamy
  • S. Siljak-Yakovlev
  • B. Lejeune
  • A. Sarr
Article

DOI: 10.1007/s00606-004-0191-6

Cite this article as:
Martel, E., Poncet, V., Lamy, F. et al. Plant Syst. Evol. (2004) 249: 139. doi:10.1007/s00606-004-0191-6

Abstract.

Phylogenetic relationships based on internal transcribed spacer (ITS) sequences were used to assess evolutionary trends in genome structure within the genus Pennisetum on the basis of observed variations in genome size, basic chromosome numbers (x=5, 7, 8 and 9) and ploidy level (from 2x to 8x). The evolutionary reconstruction is congruent with the gene pool classification and in agreement with some morphological grouping. Pearl millet, P. glaucum, together with elephant grass, P. purpureum, form a monophyletic group with a basic chromosome number of x=7 but different chromosome sizes. The ancestral characters of the genus are x=9 small chromosomes, an apomictic mode of reproduction and a perennial life cycle. Species with basic chromosome numbers of x=5, 7 and 8 appear in the most recently divergent clades, indicating that the genome structure in Pennisetum might have evolved towards a reduced chromosome number and an increased chromosome size.

Key words

PoaceaePennisetumPhylogenyITS sequenceEvolutionDysploidy

Copyright information

© Springer-Verlag Wien 2004

Authors and Affiliations

  • E. Martel
    • 1
    • 2
    • 4
  • V. Poncet
    • 2
    • 3
    • 5
  • F. Lamy
    • 2
    • 6
  • S. Siljak-Yakovlev
    • 2
    • 6
  • B. Lejeune
    • 2
    • 6
  • A. Sarr
    • 2
    • 6
  1. 1.EA 3731 Génome et Evolution des Plantes SuperieuresUniversité Claude Bernard-LyonFrance
  2. 2.Laboratoire Evolution et SystématiqueUPRESA Université Paris-SudOrsay CedexFrance
  3. 3.UMR 1097 Diversité et Génome des Plantes Cultivées, Centre IRDMontpellierFrance
  4. 4.Université Claude Bernard - Lyon 1, EA 3731 GEPSVilleurbanne CedexFrance
  5. 5.Centre IRDMontpellier Cedex 5France
  6. 6.Université Paris-SudOrsay CedexFrance