Centromeric behaviour in wheat with high and low homoeologous chromosomal pairing |
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Authors: | Luis Aragón-Alcaide Steve Reader Terry Miller Graham Moore |
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Institution: | (1) John Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, UK, GB |
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Abstract: | Control of homoeologous chromosomal pairing in hexaploid wheat stems from a balance between a number of suppressor and promoter
genes. This study used centromeric behaviour as a tool to investigate the mechanism. Fluorescent in situ hybridization employing
centromeric and telomeric sequences as probes was applied to pollen mother cells of wheat and wheat/alien hybrids having different
pairing gene combinations. It showed: association of centromeres during pre-meiotic interphase; decondensation of centromeric
structure; sister chromatid disjunction of univalent chromosomes in homoeologous pairing situations at anaphase I; and centromeric
stretching between univalent sister chromatids in wheat/rye hybrids deficient for pairing genes. The implications of these
results are discussed.
Received: December 1996 / in revised form: 11 March 1997 / Accepted: 14 March 1997 |
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