原生木质部,是指根的初生木质部的发育为外始式。其外方,也就是靠近中柱鞘的部位,是最初成熟的部分,它是由管腔较小的环纹或螺纹导管组成。
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.
可在原生木质部和初始后生木质部的管胞和导管中见到。
It is found in protoxylem and first metaxylem tracheids and vessels.
在茎原生木质部和次生木质部的形成过程中可以看到这种类型的分化。
Basipetal differentiation is seen in the formation of proto-and metaxylem in the stem.
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