Primary phloem is formed by the apical meristems (zones of new cell production) of root and shoot tips; it may be either protophloem, the cells of which are matured before elongation (during growth) of the area in which it lies, or metaphloem, the cells of which mature after elongation.

There are two types of phloem: Primary Phloem and Secondary Phloem. Primary Phloem: It is the type of phloem produced by the primary meristem of a vascular plant. Phloem that originates from the procambium during primary growth is known as primary phloem.

Phloem (/ ˈ f l oʊ. əm /, FLOH-əm) is the living tissue in vascular plants that transports the soluble organic compounds made during photosynthesis and known as photosynthates, in particular the sugar sucrose, [1] to the rest of the plant. This transport process is called translocation. [2] In trees, the phloem is the innermost layer of the bark, hence the name, derived from the Ancient ...

The primary phloem (Figure 6) is composed of sieve elements and fibres. Parenchyma cells are interspersed throughout. Sieve elements are longitudinal cells that transport food.

2021年7月23日 · The primary phloem is located in the primary plant body parts. It occurs towards the periphery as opposed to the secondary phloem that forms inner to the primary phloem. The primary phloem lacks a radial system, which occurs in the secondary phloem.

2022年10月14日 · 1. Occurs, as with xylem, as protophloem and metaphloem. Protophloem occurs in actively growing parts. It is stretched and becomes nonfunctional later, and even obliterated completely. The bicolateral vascular bundle of Cucurbita nicely shows primary phloem. 2. Only metaphloem is functional in vegetative plants. 3.

2017年2月13日 · Phloem Definition. Phloem is the complex tissue, which acts as a transport system for soluble organic compounds within vascular plants.

2024年2月27日 · The primary phloem is formed either during embryonic development from the procambium or in mature stems and roots from the vascular cambium. The primary phloem comprises components like sieve tubes, companion cells, and parenchyma cells.

2024年9月20日 · Phloem, an integral component of plants, functions similarly to the circulatory system in animals, playing a crucial role in the transportation of organic nutrients, particularly sugars made during photosynthesis.

The primary phloem can be divided into proto- and metaphloem, and if your section shows secondary xylem, it probably also contains secondary phloem. Sieve plates are specialized end walls. Try to find sieve plates in your material or images.