Abstract
Among 153 plants derived from amphiploid H. chilense× rye backcrossed twice with rye, 62 plants, with 2n = 14, had exclusively rye chromosomes; 63 plants, with 2n = 15, were monosomic additions having an extra H. chilense chromosome; the remaining 28 plants with 2n = 16-21, had from 2 to 7 extra H. chilense chromosomes. Giemsa C-banding patterns of 23 randomly selected monosomic additions (2n = 15) identified plants with 5 of the 7 H. chilense chromosomes, viz. nos. 2 (7Hch). 3 (4Hch). 4 (2Hch), 6 (6Hch), and 7 (SHch). Nearly half the monosomic additions comprised the satellited H. chilense chromosome 6 (6Hch). The two H. chilense SAT-chromosomes 6 and 7 exerted nucleolar dominance over two rye SAT-chromosomes when present together. In contrast, one H. chilense SAT-chromosome was dominated by the two rye SAT-chromosomes in plants with monosomic additions of one or the other of the H. chilense SAT-chromosomes.
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