Unexpected behavior of an inverted rye chromosome arm in wheat.

Lukaszewski AJ

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Unexpected behavior of an inverted rye chromosome arm in wheat.

机译：小麦中反黑麦染色体臂的异常行为。

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Distal location of chiasmata in chromosome arms is thought to be a consequence of the distal initiation of synapsis. Observations of meiotic behavior of a rye chromosome with an inverted arm show that patterns of chiasma distribution and frequency are also inverted; therefore, the patterns of synapsis and chiasma distribution are independent, and recombination frequency along a chromosome is position-independent and segment-specific. Since cases of random distribution of chiasmata and recombination are known in rye, a genetic mechanism must be present that licenses specific chromosome regions for recombination. Large differences in the metaphase I pairing of the inversion in various combinations of two armed and telocentric chromosomes confirm the major role of the telomere bouquet in early homologue recognition. However, occasional synapsis and chiasmate pairing of the distal regions of normal arms with the proximal regions of the inversion suggest that an alternative mechanism for juxtaposing of homologues must also be present. Synapsis in inversion heterozygotes was mostly complete but in the antiparallel orientation, hence defying homology, but non-homologues never synapsed. Instances of synapsis strictly limited to the chiasma-capable segments of the arm suggest that, in rye, both recombination-dependent and recombination-independent mechanisms for homologue recognition must be present.

机译：Chiasmata在染色体臂中的远端位置被认为是突触向远端启动的结果。观察到黑麦染色体倒臂的减数分裂行为表明，恰沙马分布和频率的模式也被倒转。因此，突触和横裂分布的模式是独立的，并且沿着染色体的重组频率是位置独立的和区段特异性的。由于黑麦中随机分布和重组的情况是已知的，因此必须存在一种遗传机制，允许特定的染色体区域进行重组。在两个武装染色体和端中心染色体的各种组合中，倒置的中期I配对存在很大差异，这证实了端粒束在早期同源物识别中的主要作用。然而，偶尔的突触和正常臂的远端区域与反位的近端区域的近位配对表明，还必须存在另一种同源物并列的机制。倒位杂合子的突触大部分是完整的，但处于反平行方向，因此无视同源性，但非同源物从未突触。突触的情况严格限于臂的具有嵌合能力的部分，这表明在黑麦中，必须存在用于同源物识别的重组依赖性和重组非依赖性机制。

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《Chromosoma》 |2008年第6期|共10页
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Lukaszewski AJ;
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正文语种 eng
中图分类医学遗传学;细胞生物学;
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1. Unexpected behavior of an inverted rye chromosome arm in wheat. [J] . Lukaszewski AJ Chromosoma . 2008,第6期

机译：小麦中反黑麦染色体臂的异常行为。
2. Chiasma frequency is region specific and chromosome conformation dependent in a rye chromosome added to wheat. (Special Issue: Advances in plant cytogenetics.) [J] . Naranjo T., Valenzuela N. T., Perera E. Cytogenetic and genome research . 2010,第1a3期

机译：Chiasma频率是区域特定的，并且染色体构型取决于添加到小麦中的黑麦染色体。（特刊：植物细胞遗传学的进展。）
3. Dissection of rye chromosome 1R in common wheat. [J] . Tsuchida M, Fukushima T, Nasuda S, Genes & Genetic Systems . 2008,第1期

机译：普通小麦中黑麦1R染色体的解剖。
4. elopment of flow cytogenetics for construction of chromosome and chromosome arm-specific DNA libraries in bread wheat. [C] . J. Safar, J. Janda, J. Bartos, International Wheat Genetics Symposium . 2003

机译：流动细胞遗传学措施施工染色体和染色体特异性DNA文库中的面包小麦。
5. Characterization of quantitative loci for morphological and anatomical root traits on the short arm of chromosome 1 of rye in bread wheat. [D] . Sharma, Sundrish. 2009

机译：面包小麦黑麦1号染色体短臂上的形态和解剖学根性状的定量位点表征。
6. Chromosome painting in plants: in situ hybridization with a DNA probe from a specific microdissected chromosome arm of common wheat. [O] . M Vega, S Abbo, M Feldman, 1994

机译：植物染色体绘画：与来自普通小麦的特定显微切割染色体臂的DNA探针进行原位杂交。
7. Chromosome painting in plants: in situ hybridization with a DNA probe from a specific microdissected chromosome arm of common wheat. [O] . Vega, M, Abbo, S, Feldman, M, 1994

机译：植物染色体绘画：与来自普通小麦的特定显微切割染色体臂的DNA探针进行原位杂交。

Unexpected behavior of an inverted rye chromosome arm in wheat.

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