n.前形成層

The first formed xylem that differentiates from the procambium. 原生木質(zhì)部最先形成的木質(zhì)部，與原形成層不同

Primary xylem Xylem derived from the procambium in the young plant. 初生木質(zhì)部：指幼嫩植物中來源于原形成層的木質(zhì)部。

Primary phloem PHLOEM derived from the procambium in the young plant. 初生韌皮部：指幼嫩植物中來源于原形成層的韌皮部。

Cells of the procambium and ground meristem are more vacuolated than those of the protoderm. 原形成層和基本分生組織的細胞比原表皮層細胞更加液泡化。

Protophloem The first-formed PRIMARY PHLOEM, differentiated from the procambium in the region just behind the meristem. 原生韌皮部：最早形成的初生韌皮部，由位于分生組織中的原形成層分化而來。