Genetic control of synapsis and recombination in Lolium amphidiploids

G. Jenkins, G Jiménez

Research output: Contribution to journalArticlepeer-review


Homologous bivalent formation in amphidiploids of Lolium is promoted during meiosis by diploidising genes carried by A-chromosomes and by supernumerary B-chromosomes. The site and mode of action of these diploidising factors were investigated by comparing the relative frequencies of pairing configurations at meiotic prophase and metaphase I in several different hybrid genotypes. The results indicate that diploidising genes act predominatly by increasing the stringency of synapsis at early stages of meiotic prophase. By contrast, B-chromosomes appear to promote bivalent formation by ensuring that homoeologously paired chromosome segments within multivalents do not crossover. The results show that the additive effects of diploidising genes and B-chromosomes are to a certain extent separable in terms of their mode of action and timing during meiosis.
Original languageEnglish
Pages (from-to)164-168
Number of pages5
Issue number3
Publication statusPublished - 01 Nov 1995


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