University of Salahaddin College of Education Biology department

Vascular tissue

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Halala Rahman Qadir M.Sc. Plant physiology

The objectives are:

Definition of vascular tissue

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Learning about Vascular tissue development

Types of vascular tissue

Definition of vascular tissue Vascular tissue: is a complex conducting

tissue, formed of more than one cell type, found in vascular plants. The primary components of vascular tissue are the xylem and phloem.

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Meaning of fruit There are two types of vascular tissue: xylem and phloem.

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1. Xylem Tracheids Vessel members Parenchyma2. Primary Xylem Protoxylem Metaxylem3. Secondary Xylem

Types of vascular tissue-xylem

Types of vascular tissue

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The xylem is principally a water transport tissue.  It moves water

and material dissolved in water from the roots to the leaves.

The xylem is composed of two tracheary elements.

Tracheary elements must die first before they assume their

ultimate function of transporting water and dissolvedmaterials.  

The xylem is composed of two tracheary

elements:  vessel elements and tracheids.

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Xylem tissue

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Types of vascular tissue-phloem1. Phloem Sieve Cells Sieve tube members Companion cells Phloem parenchyma2. Primary Phloem Protophloem Metaphloem3. Secondary Phloem

Phloem tissueThe phloem consists primarily of living cells.  A characteristic cell of

the phloem is the sieve tube member.Sieve tube members often transport food.

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Sieve plates appear when enzymes break up the ends of the tubes and connect the contents of neighboring cells.The phloem often has companion cells with it.  These cells aid in transport.

Phloem tissue

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Vascular tissue development

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Vascular Bundles with xylem & phloem

Maize or Corn – vein in cross section

Alfalfa – vein in cross section

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Transportation system in plants

1. Khan, Aslam (1 January 2001). Plant Anatomy And Physiology. Gyan

Publishing House.ISBN 978-81-7835-049-3. Retrieved 6 April 2013.

2. Peter A. Raven, Ray F. Evert, Susan E. Eichhorn (1999). Biology of

Plants. W.H. Freeman and Company. pp. 576–577. ISBN1-57259-

611-2.

3. Encyclopædia Britannica

4. http://en.wikipedia.org/wiki/Vascular_tissue

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References

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