油菜의 脂肪酸組成 改良育種에 關한 硏究 第17報 油菜突然變異 誘發에 依한 M₂ 集團의 脂肪酸組成과 低 Linolenic acid 系統選拔

Breeding for Improvement Fatty Acid Composition in Rapeseed, Brassica napus L. ⅩⅦ. Selection of Low Linolenic Acid Mutants and Variation of Fatty Acid in M₂ Generation

This experiment was conducted to select useful mutants in three rape varieties, Naehanyuchae, youngsanyuchae and Mokpo 59, with gamma-ray(30KR) mutagen and to observe on they fatty acid composition as compard with their mother varieties in M₂ generation. The pedigree breeding for improvement fatty acid composition in rapeseed with ()-erucic acid gene did not decrease linolenic acid content. But the gamma ray (30KR) treatment created mutants with lower linolenic acid as compared with their mother varieties. General investigation found that the gamma-ray induced lower palmitic and stearic acid composition of but higher linoleic and oleic acid composition. The eicosenoic acid with long chain was higher in the mutants than that in their mother varieties. The low linolenic acid lines, YE-MB-50, in M₂ generation revealed a good quality fatty acid composition or oleic and linoleic acid exhibiting 94.4% and 94.8%, respectively. Thus, the gamma-ray treatment to rape seed is desirable for mutation breeding to develope low linolenic, high oleic and linoleic acid variety.