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An ordered arrangement of bivalents at 1st meiotic metaphase of wheat triticum turgidum var durum cultivar langden 2. tetraploid wheat



An ordered arrangement of bivalents at 1st meiotic metaphase of wheat triticum turgidum var durum cultivar langden 2. tetraploid wheat



Chromosoma 91(5): 355-358



The spatial relationships between different types of marked pairs of bivalents or trivalents were studied at 1st meiotic metaphase of tetraploid wheat (2n = 4x = 28; genome AABB) by tallying the number of intervening bivalents between the marked pair. The study was carried out only in pollen mother cells with circularly arranged metaphases. Telocentric bivalents representing the 2 different arms of 1 chromosome were found very close to each other. Nonrelated trivalents of the same genome were significantly closer to each other than nonrelated trivalents of different genomes. Homoeologous trivalents tended to lie relatively close to one another. This pattern of chromosomal arrangement agrees well with previous findings in hexaploid wheat, both in mitotic and meiotic cells. In polyploid wheat the chromosomes of each genome lie relatively close to each other and are spatially separated from those of the other genomes.

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