英语词典
The secondary phloem mother cell were divided and differentiated into sieve tube, companion cell, libriform fibre, parenchyma cell, and a few sclereid cells, The sieve tube and companion cell was originated from inequality mitosis of sieve mother cell.
维管形成层韧皮部母细胞分裂分化形成筛管、伴胞、韧皮薄壁细胞、韧皮纤维和少量的石细胞,筛管和伴胞来源于筛管母细胞的不均等有丝分裂。
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