初生木质部 primary xylem

互联网2013-11-14

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　　在茎尖或根尖的初生分生组织中原始形成层分化，向内分化为木质部，向外分化为韧皮部，其最初的部分分别称为原生木质部、原生韧皮部，进一步分化而继续形成的部分称为后生木质部和后生韧皮部，它们又分别称为初生木质部和初生韧皮部。这是以后由形成层活动形成的次生木质部和次生韧皮部的对应词。

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