It was indicated, from the endogenous hormone change in the course of mature embryos of welsh onion regeneration, that auxin had phase effect: it affected actively in the start-up stage of callus inducing with its high concentration;

• 大葱成熟胚再生过程中内源激素含量的变化试验表明,生长素对大葱的离体再生表现为阶段效应,在愈伤组织诱导的启动阶段含量很高,有积极作用;