Chromosomal Constitution of Rye (Secale Cereale) – Hordeum Chilense Addition Lines

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. Copyright © 1993, Wiley Blackwell. All rights reserved