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Cytological evidence for assortment mitosis leading to loss of heterozygosity in rice

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In the root meristem cells of the rice line AMR, which causes loss of heterozygosity in its hybrids, both normal and assortment mitoses were observed. During normal mitosis, chromosomes did not form homologous pairs at metaphase; all chromosomes lined up at the equatorial plate and 2 chromatids of each chromosome disjoined at the centromere and moved toward opposite poles. During assortment mitosis, varying numbers of paired homologues were observed at mitotic metaphase. Two groups of 12 chromosomes separated and moved towards the opposite poles of daughter cells with few chromosomes having their chromatids separated at anaphase. These observations support the proposed mechanism that is responsible for early genotype fixation in rice hybrids involving AMR.Key words: mitosis, homologous chromosome, genotype fixation, loss of heterozygosity, rice.

Dans les cellules méristématiques des racines chez la lignée AMR du riz, laquelle entraîne une perte d'hétérozygotie chez ses hybrides, des mitoses normales et « avec assortiment » ont été observées. Chez ces premières, les chromosomes ne formaient pas des paires d'homologues à la métaphase. Tous les chromosomes s'alignaient à la plaque équatoriale et 2 chromatides de chaque chromosome se séparaient au niveau du centromère et migraient vers des pôles opposés. Dans les méioses « avec assortiment », un nombre variable d'homologues appariés ont été observés à la métaphase mitotique. Deux groupes de 12 chromosomes se sont déplacés vers les pôles opposés des cellules filles et peu de chromosomes se séparaient en chromatides à l'anaphase. Ces observations viennent appuyer le mécanisme proposé pour expliquer la fixation rapide des génotypes chez les hybrides impliquant AMR.Mots clés : mitose, chromosome homologue, fixation génotypique, perte d'hétérozygotie, riz.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: May 1, 2006

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  • From its inception in 1957, this international cytogenetics journal has catered to the research areas of the members of the Genetics Society of Canada; traditionally, these have included agriculture, entomology, genetics/cytogenetics, and evolutionary mechanisms. The contents of the journal have evolved as contributors developed new technologies and interests. A 20-member Editorial Board is composed of scientists from around the world. Reviews and commentary from respected experts are often featured.
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