A sharp demarcation of adventive embryos from zygotic embryos cannot be drawn . 不定胚与合子胚之间不能划分出明显的界限。
2.
For long-term tissue cultures of domestic carrot the only requirement for adventive embryogeny was addition of an auxin . 栽培的胡罗卜进行长期组织培养时，对不定胚发生的唯一要求是加进植物生长素。
