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与受精卵具同样形态变化过程的植物体细胞形成的胚，亦称胚状体（ embryoid）。在自然状态下，柑桔类（ Citrus）的珠心细胞和珠被细胞可进行单性生殖，形成不定胚。此外有的经分离、培养的体细胞在一定培养条件下发挥全能性（ totipotency）而形成不定胚。不定胚可进一步发育成完全的植物体。胡萝卜（ Daucus carota）等一些植物可从其各部分的细胞培养成不定胚。不定胚的形成过程可区分为球状胚（ globular embryo）、心形胚（ heart shapedembryo）、鱼雷形胚（ torpedo embryo）等各个阶段。
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