세대단축을 위한 장일조건에서 트리티케일의 생육특성

Growth Characteristics of Triticale under Long-day Photoperiod for Rapid Generation Advancement

Consumer demand for Triticale cultivars as a winter forage crop in Korea has been increasing because of its ability for high andstable yield. However, more than 10 years are required to develop new varieties with conventional breeding programs. A speed breedingsystem using long-day photoperiodic treatment has recently been suggested and applied in wheat and barley, but not in the triticale breedingprogram in Korea. To evaluate the availability of the established speed breeding system for triticale breeding programs in Korea, we usednine domestic triticale cultivars to investigate their growth characteristics under a 22 h photoperiod. The average days to heading (DTH) ofthe nine cultivars was 38 days, and Gwangyoung and Minpung showed the most delayed DTH at 42 days. Therefore, all nine triticale cultivarswere able to shorten the growth duration under the tested photoperiod condition. One productive tiller and more than 10 seeds were obtainedfrom each cultivar. The germination percentage was over 82% when the spikes were harvested 20 days after heading, dried, and chilled fora week to break dormancy. These results suggest that in Korea, the rapid generation advancement system with simple long-day photoperiodictreatment can be applied to triticale breeding programs to reduce the breeding time.