protophloem

protophloem

1. OUYANG X Z,XIE S P,LI B J.Differentiation and ultrastructure of the protophloem seive elements of minor veins in the maize leaves:Changes in the protoplast[J].Acta Botanica Sinica,1998,40(1):14-21.

[4]欧阳学智,谢绍萍,李宝健.玉米叶片细麦原生韧皮部筛分子的分化和超微结构:原生质体的变化[J].植物学报,1998,40(1):14-21.

2. protophloem poles

原生韧皮部极

3. When the sieve tube members appeared in protophloem, there were a lay of procambium bundle cells reserved between the sieve tube members and bundle sheath.

原生韧皮部筛管产生时，其外方尚保留1-2层原形成层细胞，当后生韧皮部和木质部开始分化时，此层细胞分裂。

4. Protophloem The first-formed PRIMARY PHLOEM, differentiated from the procambium in the region just behind the meristem.

原生韧皮部：最早形成的初生韧皮部，由位于分生组织中的原形成层分化而来。

5. Portion of a protophloem sieve element at the stage of maturation.

另外可见到电子致密的多膜复合体（箭）。

6. mature protophloem element

成熟的原生韧皮部成分

7. A protophloem sieve element at an early stage of maturation,showing a nucleus at the onset of degeneration.

注意高尔基体发生某些变化，显示解体的迹象。

8. It consists of the PROTOPHLOEM (formed first) and METAPHLOEM.

由原生韧皮部（最早形成的）和后生韧皮部组成。

9. The PROTOPHLOEM and METAPHLOEM are primary tissues and derived from the procambium，while the secondary phloem is formed from the VASCULAR CAMBIUM.

苯丙氨酸是苯化合物以及像箭毒和吗啡等生物碱的前体。

10. Mature or almost mature protophloem sieve element.

质膜已发生局部解体。