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

Abstract

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

Acceleration of wheat breeding: enhancing efficiency and practical application of the speed breeding system

“…In contrast, the SB room, which is set at 22 °C during the day (22 h) and 17 °C at night (2 h) [ 17 ], can be modified to take advantage of natural environmental conditions to save energy and money on the installation and management of the controlled indoor growth room. Cha et al [ 7 , 18 ] reported a significant reduction in the days to heading (DTH) for spring wheat and triticale using a 22-h photoperiod with 10 h of natural sunlight and 12 h of artificial lighting.…”

Development of Speed-Breeding System for Korean Soybean Varieties [Glycine maxa (L.) Merr] Using LED Light Source

“…A new breeding method that goes beyond the limitations of these methods was developed, which is a speed breeding (SB) strategy (O'Connor et al 2013;Watson et al 2018;Voss-Fels et al 2019) that breeds variety in an indoor growing room using a light-emitting diode (LED) created in an environment similar to the light conditions in the field. It has been reported that the single seed descent (SSD) method was used to successfully breed spring wheat, durum wheat, and barley during a short breeding period under SB conditions (Ghosh et al 2018) and screening of quantitative traits in barley and wheat (Hickey et al 2017;Alahmad et al 2018), shortening of the breeding period of rice, amaranth, and soybeans using SB (Jahne et al 2020) and reducing growth period in wheat and triticale (Cha et al 2020;Cha et al 2021) were announced. However, only a few researches have published the results of a breeding method using SB.…”