St. M. TSVETKOV
Dobroudja Agricultural Institute, BG-9520 General Toshevo, Bulgaria
TSVETKOV, St. M., 2002. Triticale Mexitol 1 (2n = 6x = 42) – a joint breeding product of CIMMYT – Mexico and Dobroudja Agricultural Institute – Bulgaria. Bulg. J. Agric. Sci., 8: 493–497
The production of 42-chromosome triticale of intensive type with short stem and high productivity became possible for the first time in Bulgaria on the basis of the joint breeding programme of CIMMYT-Mexico and DAI-Bulgaria. The result from this co-operation was the creation of triticale Mexitol 1 (2n = 6x = 42). This cultivar originated from a bulk population in F3 – F5 between winter and spring triticale with origin from CIMMYT-Mexico. Systematically it belongs to the 42-chromosome triticale of the wheat type (X Triticosecale Wittmack). In 1976, at the Dobroudja Agricultural Institute-General Toshevo, Bulgaria for the first time a record yield of 11620 kg/ha grain was obtained, the yield from the winter wheat cultivar Sadovo 1 being 8500 kg/ha. In triticale Mexitol 1 a considerable progress was achieved in stabilizing the meiosis in PMC (32.28 % mean percent of meiotic disturbances, that of AD-Winter-USA being 48.93 %).
The high productivity of Mexitol 1 is very favourably combined with very high lysine content as % from grain protein. Averaged for 2 years, the lysine content in the grain of Mexitol 1 amounted to 3.93 %, that of wheat Sadovo 1 being 2.82 %, of barley No 468 – 3.01 %, and of rye No 59 – 3.02 %. The mean lysine yield of Mexitol 1 was 34.700 kg/ha, that of the wheat cultivar Sadovo 1 being 21.700 kg/ha. In trails for feeding of chicken broilers it was established that when substituting 25 and 50 % of the maize with grain from triticale Mexitol 1, the biological value of the mixed forage increased, as a result of which a higher increase per nutrition substance unit was obtained.