The F₁ hybrid rapeseed (Brassica napus L.) exploits heterosis to deliver greater yield, stability, and uniformity than open-pollinated cultivars, making it suitable for large- scale cultivation. In Korea, cultivation is shifting from landscape and apiculture to expanding edible oil production and increasing the demand for paddy field-adapted hybrids. Using Mokpo-CGMS as the female and the pollen parent ‘09003-B-126-2-1-3,’ we developed the breeding line ‘Dangyo 80,’ which, after multi-environment evaluations of yield and oil quality against ‘Sunmang,’ was selected as a new cultivar ‘Areum. ’ ‘Areum’ exhibits growth habit type IV, yellow flowers, and a red seed coat. Its flowering and maturity times are comparable to ‘Sunmang. ’ Major growth indices did not differ significantly among cultivars; however, while ‘Areum’ showed slightly greater lodging susceptibility, it displayed higher resistance to Sclerotinia stem rot. Notably, in paddy fields ‘Areum’ achieved a higher plant density per square meter than ‘Sunmang’ which produced a 31% yield increase. In fatty acid composition, ‘Areum’ had higher oleic acid content (65% vs. 60%) and lower erucic acid (0.95% vs. 1.35%) than ‘Sunmang,’ indicating improved suitability for high-quality edible rapeseed oil production (Registration No. 9755).

Enhancing pod shatter resistance is essential for improving the mechanical harvesting efficiency of rapeseed (Brassica napus L.). This study aimed to evaluate pod shatter resistance in domestic breeding lines and genetic resources, as well as to investigate the relationship between shatter resistance and agronomic traits thereby providing foundational data for the development of shatter-resistant cultivars. Pod shatter resistance was assessed using the Random Impact Test for 105 accessions in 2022–2023 and 159 accessions in 2023–2024, with the Silique Shatter Resistance Index (SSRI) as the evaluation criterion. Most accessions exhibited susceptibility to pod shatter, whereas IT031375 showed high shatter resistance, identifying it as a promising resource for the development of shatter-resistant cultivars. Analysis of the relationship between weather conditions and pod shatter resistance revealed that longer sunlight exposure and lower precipitation during the growing stages contributed to improved pod development and shatter resistance. Furthermore, a correlation analysis between SSRI and agronomic traits demonstrated significant positive correlations with silique length (r=0.368, p<0.001) and weight (r=0.451, p<0.001). Increased silique length and weight are associated with enhanced pod wall development and seed weight, which are critical for improving yield and shatter resistance.