根的次生木质部导管大。
SKC1在木质部导管周围的薄壁细胞特异表达。
SKC1 is preferentially expressed in the parenchyma cells surrounding the xylem vessels.
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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