pith mother cell 髓母细胞
There was hypha in 1- 10layers cell of surface in young tumour-body base. Grown tumour-body formed periderm, vascular bundle and a lot of pith cells.
幼期的瘤状体基部表面1—10层细胞内含菌丝，长大的瘤状体形成周皮，内部形成大量维管束和髓；
But outer pith cell of hollow center potato was bigger than that of normal one, and the cell wall was thicker. But the wall of pith cell was thiner than that of normal one.
空心块茎环髓区细胞壁厚度比健康块茎的厚，而心髓区细胞壁厚度则比健康块茎的薄；
Latent root primordium was not found in shoots in test tubes. The induced root primordium which originated from the division and differentiation of pith ray cell developed into the adventitious roots.
并对四倍体刺槐无性系试管苗不定根的发育过程进行了解剖观察，结果表明试管苗嫩梢无潜伏根原基，不定根由诱生根原基发育形成，诱生根原基源于髓射线细胞的分裂和分化。
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