‘Chaeheun’ is a mung bean cultivar developed to improve resistance to pod shattering and suitability for mechanical harvesting, while maintaining high sprout productivity. It was derived from a cross between ‘Dahyun,’ an erect plant-type cultivar, and IT273801, a genetic resource with strong pod-shattering resistance, in 2020. Segregating generations were advanced using the pedigree method, and the selected line was evaluated in an advanced yield trial in 2022 and in regional yield trials at three locations from 2023 to 2024. When sown in late June, ‘Chaeheun’ flowered on July 30 and matured on August 16, 1 and 2 days earlier than ‘Eowool,’ respectively. Plant height was 69 cm, 16 cm shorter than that of ‘Eowool,’ indicating better suitability for mechanical harvesting. The 100-seed weight was 4.9 g, and the mean grain yield was 2.57 ton ha-1, representing an 8% increase over ‘Eowool.’ Under indoor drying conditions, the pod-shattering rate was 13.5%, confirming improved resistance to shattering. In sprout evaluation, ‘Chaeheun’ showed a germination rate of 98.3% and a hard-seed rate of 0.8%. Hypocotyl length and thickness were 8.9 cm and 2.23 mm, respectively, and sprout yield reached 762%, which was 52 percentage points higher than that of ‘Eowool.’ These results indicated that ‘Chaeheun’ is a promising cultivar for mechanized production and sprout use (Registration No. 10766).
Chu et al. (Mon,) studied this question.