Lukaszewski, A.J., Kopecký, D.
CYTOGENETIC AND GENOME RESEARCH
129:
117-123,
2010
Klíčová slova:
Diploid-like pairing, Introgression, Meiosis, Ph1 locus, Rye, Wheat
Abstrakt:
The Ph1 locus on chromosome 5B enforces strictly bivalent
pairing in polyploid wheat, but the exact mechanism of its
action remains unknown. Pairing restriction involves not
only wheat homoeologues and all alien introgressions but
also differentiated homologues. In this study we show that
chromosome 5B with its Ph1 locus also controls chromosome
pairing in autotetraploid rye by apparently restricting
chiasma formation between dissimilar homologues. Unlike
in wheat, the effect appears to be dosage-dependent,
which may be a reflection of an interaction between Ph1
and the rye chromosome pairing control system. With 2
doses of Ph1 present, chiasmate pairing was severely restricted
resulting in a significantly higher number of univalents
and bivalents per cell than in the controls. The restrictions
imposed by Ph1 virtually eliminated MI pairing of chromosome
arms polymorphic for their C-band patterns and
did not appear to affect arms with similar patterns. If the
polymorphism for C-bands is taken as a measure of the overall
chromosome similarity/divergence, such differences were recognized and acted upon by the Ph1 locus. The fact
that Ph1 operates in rye in the same fashion as in polyploid
wheats suggests that it controls some basic mechanism of
chromosome recognition.
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