in Anatomy of Flowering Plants by

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DIFFERENCE BETWEEN PROTOPHLOEM AND METAPHLOEM

Protophloem

Metaphloem

1. It is the firstly formed phloem.

1. It is the later formed phloem.

2. The elements of protophloem are slender and elongated.

2. The elements are wide, long and conspicuous.

3. It is subjected to stress due to elongation.

3. Metaphleom elements are not subjected to elongation.

4. Companion cells are rare or mostly absent.

4. All phloem elements like sieve tube cells, companion cells, phloem parenchyma and phloem fibres are present.

5.  Protophloem elements are simple in nature.

5. Metaphloem elements are complex in nature.

 

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