ALLOPLASMIC WHEAT - ELYMUS-CILIARIS CHROMOSOME ADDITION LINES

Alloplasmic euploid wheat with the cytoplasm of Elymus ciliaris (2n = 4x = 28, S(c)S(c)Y(c)Y(c)) is male sterile and has reduced vigor. Howe ver, alloplasmic plants with E. ciliaris chromosomes 1S(c) or 1Y(c) ma rked by gliadin genes Gli-S(c)1 and Gli-Y(c)1, respectively, are vigor ous and fertile. The Rf genes on 1S(c) and 1Y(c) are named Rf-S(c)1 an d Rf-(c)1. Two chromosome translocations involving 1Y(c) were isolated . The first involved the short arm of 1Y(c) translocated to the short arm of wheat chromosome 3B. The second involved the short arm of 1Y(c) translocated to the short arm of a chromosome, designated L, of E. ci liaris. The second line also has another E. ciliaris chromosome design ated A and lacks wheat chromosome 6A. This line is resistant to Puccin ia recondita. The relationship between fertility restoration and nucle olar organizing regions is discussed.