A reassessment of genome relationships between Thinopyrum bessarabicum and T. elongatum of the Triticeae

摘要: Chromosome pairing and chiasma frequency in diploid (2n = 2x = 14; JE genomes), amphidiploid (2n = 4x = 28; JJEE), triploid (2n = 3x = 21; JJE) hybrids between Thinopyrum bessarabicum JJ) T. elongatum EE) were analyzed. The (JE) showed a mean of < 0.01V + 0.30IV + 0.28III + 4.98II + 1.97I with 8.36 chiasmata per cell. was rather poor, most bivalents being rod-shaped; some clearly hetero-morphic loosely paired (probably pseudochiasmate). sterile, showing the reproductive isolation parental species. JJE had chromosome configuration < 0.01VI + 0.06IV + 1.53III + 5.46II + 5.20I 13.45 Chromosomes duplicated genome JJ preferential pairing, forming mostly ring two or even three each, as parent; chromosomes E remained univalents. Thus, chromosom...