筛孔 sieve pore

互联网2013-11-15

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指筛区上存在的多数小孔。其直径胡桃为1.8—3.5微米，南瓜在5微米以下。筛孔中央由原生质贯穿，其周围为胼胝体所包围。随着筛管成分的老化，胼胝体数量增大，最后隔断原生质丝，并进而沉积在筛区的两个表面上，使筛孔闭塞。

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