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Plant Physiol, March 2001, Vol. 125, pp. 1304-1313
Molecular Evolution of Receptor-Like Kinase Genes in Hexaploid
Wheat. Independent Evolution of Orthologs after
Polyploidization and Mechanisms of Local Rearrangements at
Paralogous Loci1
Catherine
Feuillet,
Anja
Penger,
Klaus
Gellner,
Austin
Mast, and
Beat
Keller*
Institutes of Plant Biology (C.F., B.K.) and Systematic Botany
(A.M.), University of Zurich, CH-8008 Zurich, Switzerland; and
Epidauros Biotechnologie AG, D-82347 Bernried, Germany (A.P.,
K.G.)
Hexaploid wheat is a young polyploid species and represents a good
model to study mechanisms of gene evolution after polyploidization. Recent studies at the scale of the whole genome have suggested rapid
genomic changes after polyploidization but so far the rearrangements that have occurred in terms of gene content and organization have not
been analyzed at the microlevel in wheat. Here, we have isolated members of a receptor kinase (Lrk) gene family in
hexaploid and diploid wheat, Aegilops tauschii, and
barley (Hordeum vulgare). Phylogenetic analysis has allowed
us to establish evolutionary relationships (orthology versus paralogy)
between the different members of this gene family in wheat as well as
with Lrk genes from barley. It also demonstrated that
the sequences of the homoeologous Lrk genes evolved
independently after polyploidization. In addition, we found evidence
for gene loss during the evolution of wheat and barley. Analysis of
large genomic fragments isolated from nonorthologous Lrk
loci showed a high conservation of the gene content and gene
organization at these loci on the homoeologous group 1 chromosomes of
wheat and barley. Finally, sequence comparison of two paralogous
fragments of chromosome 1B showed a large number of local events
(sequence duplications, deletions, and insertions), which reveal
rearrangements and mechanisms for genome enlargement at the
microlevel.
1
This work was supported by the Swiss Priority
Programme Biotechnology (grant nos. 5002-45033 and 5002-57824).
*
Corresponding author; e-mail bkeller{at}botinst.unizh.ch; fax
41-16348204.
© 2001 American Society of Plant Physiologists
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