Synaptonemal complex spreading in Allium. II. Tetraploid A. vineale

J. Loidl
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引用次数: 41

Abstract

In tetraploid Allium vineale four homologous axes are closely aligned in unsynapsed regions at early zygotene. This alignment is brought about by intercalary and terminal associations. The intercalary association sites are possibly targets of forces for long distance attraction of homologues and potential pairing initiation sites. The terminal associations are mediated by dense spherules and result possibly from the attachment of the telomeres to the nuclear envelope. In pachytene the alignment is abolished and the four axes are synapsed two by two, resulting in bivalents or, owing to partner switches in the synapsed axes, in quadrivalents. From the number of partner switches per configuration the number of pairing initiation sites is estimated. Homologous alignment and synapsis are discussed, comparing them with the conditions in a triploid species, which were described in a previous paper.Key words: Allium vineale, synaptonemal complex, polyploids, chromosome pairing, meiosis.
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葱属植物突触复合体展开。2。四倍体葡萄
在四倍体葱属植物中,四条同源轴在接合前期的未突触区紧密排列。这种排列是由端间和端间结合引起的。鞘间结合位点可能是同源物长距离吸引力的目标和潜在的配对起始位点。端粒结合是由致密球介导的,可能是端粒附着在核膜上的结果。在pachytene中,排列被取消,四个轴被两个两个地突触,产生二价体,或者由于突触轴中的伴侣开关,产生四价体。从每组态的伙伴切换数量估计配对起始位点的数量。讨论了同源序列和突触,并将其与前一篇文章中描述的三倍体物种进行了比较。关键词:葱,突触复合体,多倍体,染色体配对,减数分裂
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