INTERGENERIC HYBRIDIZATION AND C-BANDING PATTERNS IN HORDELYMUS (TRITICEAE, POACEAE)

Crosses of Hordelymus europaeus (2n = 4x = 28) with four genera in the Triticeae were attempted. Adult hybrids were obtained in combinations with Hordeum bogdanii (2x), Hordeum depressum (4x), and Secale cereal e (2x). The meiotic pairing was very low in the hybrids with H. bogdan ii and Secale cereale (0.12 and 0.30 chiasmata/cell, respectively), wh ereas high pairing (9.90 chiasmata/cell) was found in hybrids with H. depressum due to autosyndetic pairing of H. depressum chromosomes. The chromosome complement of Hordelymus europaeus comprised 16 metacentri cs, 8 submetacentrics, and 4 SAT-chromosomes. The Giemsa C-banding pat terns of the chromosomes were characterized by small to minute bands a t no preferential positions. It is hypothesized that Hordelymus europa eus may genomically be closest related to Taeniatherum and Psathyrosta chys spp.