Cytogenetics of Hybrids of Thinopyrum elongatum (2n =2x= 14, or 2n =4x=28) with Hordeum vulgare, Secale cereale and Triticum turgidum

Abstract

New hybrids of Thinopyrum elongatum (2n = 2x =14, EE and 2n = 4x = 28, E₁E₁E₂E₂) were obtained with Hordeum vulgare (2n = 2x =14, HH), Secale cereale (2n = 2x =14, RR), and Triticum turgidum (2n = 4x = 28, AABB) in a low frequency. The hybrids were somatically stable with 2n = 3x = 21 chromosomes for Th. elongatum/H. vulgare (E1E2H), Th. elongatum/S. cereale (E₁E₂R) and T. turgidum/ Th. elongatum (ABE). All hybrids had an intermediate phenotype of the parents and where possible to conduct meiotic analyses expressed a predominant univalent formation at MI, a relationship typical of distant hybrids. In Th. elongatum/ H. vulgare F₁ meiotic associations of 20.19 univalents suggest an alteration of the anticipated higher pairing possible due to autosyndesis of the E₁E₂2 genomes of tetraploid Th. elongatum. This may presumably be an influence of the H. vulgare genome.