Acquirement of the Ogura Cytoplasmic Male Sterile Lines and Genetic Studies during the Procedure of Their Creation in Chinese Cabbage-pak-choi (Brassica Campestris ssp. Chinensis Makino) and Turnip (B. Campestris ssp. Rapifera Sinsk)

• 白菜与芜菁Ogura雄性不育系的获得及其创建过程中的遗传学研究