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. However, alloplasmic plants with E. ciliaris chromosomes 1S(c) or 1Y(c) marked by gliadin genes Gli-S(c)1 and Gli-Y(c)1, respectively, are vigorous and fertile. The Rf genes on 1S(c) and 1Y(c) are named Rf-S(c)1 and 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. ciliaris. The second line also has another E. ciliaris chromosome designated A and lacks wheat chromosome 6A. This line is resistant to Puccinia recondita. The relationship between fertility restoration and nucleolar organizing regions is discussed.