Seeds of the primary trisomics derived from cultivar 'Betzes' were planted in the greenhouse in 1996 for seed increase. A new trisomic plant with 2n=13 + 1 acro 6S^L + 1 acro 6L^S was isolated in a F₂ population from a cross between triplo 6 with chlorina f13 or B2-4. Of the 123 plants resulting from the selfing of this new plant, 72 had a chromosome constitution of 2n=13 + 1 acro 6S^L + 1 acro 6L^S; 23 plants had 2n=12 + 2 acro 6S^L + 2 acro 6L^S; and 28 plants with 2n=14. The plants having 2n=13 + 1 acro 6S^L + 1 acro 6L^S, may be considered as compensating diploids, with a short fragment at the centromeric region triplicated. Various compensating types in barley have been reported previously by Tsuchiya (1973) and Singh and Tsuchiya (1993).

References:

Tsuchiya, T. 1973. A barley strain with 2n=12 + 4 telocentric chromosomes (2 pairs). Cereal Research Communication, 1(3): 23-24.

Singh, R.J., and T. Tsuchiya. 1993. Cytogenetics of two novel compensating diploids in barley (Hordeum vulgare). Genome, 36: 343-349.