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protoxylem n.【植物;植物學】原生木質部。

protozoa

4 . the studies focused on the cnz of dianthus barbatus and saponaria offlcinalis seedlings applied two different vascular cylinder types , even through they both were “ “ - shape exarch and diarch haplostele , their patterns of protoxylem and m 此外,在商陸科的美洲商陸的子葉節區下部發現了一種具有雙大括號狀( “ { } ” )的維管柱類型。

In seed plants the protoxylem occurs at the innermost edge of the vascular bundles in stems , but external to the later - formed xylem in roots 在種子植物中,原生木質部發生在莖的維管束的最內方,但在根中,位于后生木質部的外方。

Annular thickening rings of thickening laid down on the inner wall of protoxylem vessels and tracheids 環狀加厚:原生木質部導管和管胞的內層環狀?厚。

It consists of the protoxylem ( formed first ) and metaxylem 包括原生木質部(最早形成的)和后生木質部。