Attempts to induce homoeologous pairing between wheat and Agropyron cristatum genomes.
Agropyron cristatum (2n = 4x = 28, PPPP) possesses potentially valuable traits that could be used in wheat (Triticum aestivum) improvement through interspecific hybridization. Homoeologous pairing between wheat chromosomes and P chromosomes added to wheat in a set of wheat - A. cristatum addition lines was assessed. First, the Ph-suppressing effect of P chromosomes (except 7P) was analyzed. It was concluded that this system is polygenic with no major gene, and consequently, has no prospect in the transfer of alien genes from wild relatives. In a second step, the potential of the deletion ph1b of the Ph1 gene for inducing P-ABD pairing was evaluated. Allosyndetic associations between P and ABD genomes are very rare. This very low level of pairing is likely due to divergence in the repeated sequences between Agropyron and wheat genomes. Development of translocation lines using ionizing radiation seems to be a more suitable technique than homoeologous recombination to exploit the A. cristatum genome in wheat improvement.
I.N.R.A., UMR APBV, Domaine de la Motte, BP 35327, 35653 Le Rheu CEDEX, France. Melanie.Jubault@rennes.inra.fr
Mélanie
M
Jubault
Anne-Marie
AM
Tanguy
Paulette
P
Abélard
Olivier
O
Coriton
Jean-Claude
JC
Dusautoir
Joseph
J
Jahier
D031702:Agropyron / Q000235:genetics*; D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D003433:Crosses, Genetic; D003582:Cytogenetics; D017343:Genes, Plant; D018745:Genome, Plant; D007621:Karyotyping; D008957:Models, Genetic; D009693:Nucleic Acid Hybridization; D011058:Pollen; D014908:Triticum / Q000235:genetics*