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导管分子的发育过程:

  1. 细胞壁木化增厚;
  2. 胞溶现象(液泡膜破裂,释放水解酶,原生质体解体);
  3. 端壁解体;
  4. 形成穿孔;

导管(环纹、螺纹、梯纹、网纹、孔纹)

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