Abstract
The inverse types of autoallotriploid of Lolium temulentum × L. multiflorum have different trivalent frequencies and the possible causes were investigated by analysis of synaptonemal complex (SC) formation at zygotene. There is less synchrony in axial element (AE) formation in the TMM type than TTM. There are two autonomous pairing sites (APS) in the terminal regions, one at the end of the AE (telomeric) and one in a subterminal position. In the TMM combination, the L. temulentum subterminal APS cannot compete effectively with the pair of L. multiflorum APSs at synapsis and SCs are initiated between L. multiflorum AEs, but in TTM the L. multiflorum site competes with the pair of L. temulentum sites and SCs are frequently formed between homoeologous AEs. The L. temulentum chromosomes seem to be later in reaching a ready-to-pair stage and the results are taken to support the idea that genome asynchrony can lead to preferential pairing of chromosomes in polyploids.
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Albini, S M, and Jones, G H. 1987. Synaptonemal complex spreading in Allium cepa and A. fistulosum I. The initiation and sequence of pairing. Chromosoma, 95, 324–338.
Bennett, M D. 1976. The cell in sporogenesis and spore development. In: Yeoman, M. M. (ed.) Cell Division in Higher Plants, pp. 161–198. Academic Press, London.
Callow, R S, and Gladwell, I. 1984. A general treatment of chromosome synapsis in even-numbered polyploids. J Theor Biol, 106, 455–494.
Evans, G M, and Aung, T. 1985. Identification of a diploidizing genotype of Lolium multiflorum. Can J Genet Cytol, 27, 498–505.
Holm, P B. 1977. Three dimensional reconstruction of chromosome pairing during the zygotene stage of meiosis in Lilium longiflorum (Thumb). Carlsberg Res Comm, 42, 103–151.
Hutchinson, J, Rees, H, and Seal, A G. 1979. An assay of activity of supplementary DNA in Lolium. Heredity, 43, 411–421.
Jenkins, G. 1985. Synaptonemal complex formation in hybrids of Lolium temulentum × Lolium perenne (L.) II. Triploid. Chromosoma, 92, 387–390.
Jones, G H, and Croft, J A. 1986. Surface spreading of synaptonemal complexes in locusts. II. Zygotene pairing behaviour. Chromosoma, 93, 489–495.
Loidl, J. 1990. The initiation of meiotic chromosome pairing: the cytological view. Genome, 33, 759–778.
Morgan, W G, Thomas, H, Evans, M, and Borrill, M. 1986. Cytogenetic studies of interspecific hybrids between diploid species of Festuca. Can J Genet Cytol, 28, 921–925.
Rasmussen, S W. 1976. The meiotic prophase in Bombyx mori females analyzed by three dimensional reconstructions of synaptonemal complexes. Chromosoma, 54, 245–293.
Rasmussen, S W. 1986. Initiation of synapsis and interlocking of chromosomes during zygotene in Bombyx spermatocytes. Carlsberg Res Comm, 51, 401–432.
Rasmussen, S W, and Holm, P B. 1980. Mechanics of meiosis. Hereditas, 93, 187–216.
Thomas, H M. 1988. Chromosome elimination and chromosome pairing in tetraploid hybrids of Hordeum vulgare × H. bulbosum. Theor Appl Genet, 76, 118–124.
Thomas, H M. 1990. Analysis of synaptonemal complexes in the amphiploid of Lolium multiflorum × Festuca drymeja. Genome, 33, 903–907.
Thomas, H M. 1995. Meiosis in triploid Lolium. II. Discrepancies between the analyses of chromosome configurations at metaphase I in inverse autoallotriploid combinations. Heredity, 75, 446–452.
Thomas, H M, and Morgan, W G. 1990. Analysis of synaptonemal complexes and chromosome pairing at metaphase I in the diploid intergeneric hybrid Lolium multiflorum × Festuca drymeja. Genome, 33, 465–471.
Thomas, H M, and Thomas, B J. 1994. Meiosis in triploid Lolium. I. Synaptonemal complex formation and chromosome configuration at metaphase I in aneuploid autotriploid L. multiflorum. Genome, 37, 181–189.
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Thomas, H., Thomas, B. Meiosis of triploid Lolium. III. Synaptonemal complex formation in the two inverse autoallotriploids of L. temulentum and L. multiflorum, TTM and TMM. Heredity 76, 28–35 (1996). https://doi.org/10.1038/hdy.1996.4
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DOI: https://doi.org/10.1038/hdy.1996.4
