GENOME RELATIONSHIPS AMONG ELYTRIGIA (=AGROPYRON) ELONGATA, E. STIPIFOLIA, "E. ELONGATA 4x," E. CAESPITOSA, E. INTERMEDIA, AND "E. ELONGATA 10x"

Abstract

Hybrids were obtained from the crosses Elytrigia elongata (Host) Holub × "E. elongata 4x", E. stipifolia Czern. ex Nevski × "E. elongata 4x," "E. elongata 4x" × E. caespitosa (C. Koch) Nevski, and E. intermedia (Host) Nevski × E. caespitosa. "Elytrigia elongata 10x" was crossed with four ditelosomic additions of E. elongata telosomes to Triticum aestivum L. em. Thell. Elytrigia intermedia was crossed with ditelosomic addition of "E. elongata 10x" telosome 7e11α to T. aestivum. The S genome of E. stipifolia appears to be related only very remotely to the E genome of E. elongata. "Elytrigia elongata 4x" has two modified E genomes, which are designated Es and Esc. The genomes of E. caespitosa, tentatively designated X15 and X15c, are related to each other; both are considered to be distantly related to the E genome. Elytrigia intermedia has two genomes, designated N and N1, that are distantly related to the E genome and one genome of an unknown origin tentatively designated X4. It is suggested that "E. elongata 10x" has at least two genomes that are related to the E. genome.