When the sieve tube members appeared in protophloem, there were a lay of procambium bundle cells reserved between the sieve tube members and bundle sheath.
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释义
原生韧皮部筛管产生时,其外方尚保留1-2层原形成层细胞,当后生韧皮部和木质部开始分化时,此层细胞分裂。
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