环状加厚：原生木质部导管和管胞的内层环状増厚。

Annular thickening rings of thickening laid down on the inner wall of protoxylem vessels and tracheids.

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与健康组织相比。其管胞的长、宽和木射线高度均差异显著。

There are significant difference in tracheids' length and width and height of wood ray comparing with healthy tissues.

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吸器中管胞和筛管都是从吸器中央具有原形成层特性的细胞分化的，管胞的分化先于筛管，或同时进行。

The tracheid and sieve tube elements are all differentiated from the procambia in the center of the haustoria, and the former occurs prior to the latter.

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