Dictionary > Metaxylem

Metaxylem

Definition
noun
The part of the primary xylem that is last to develop from the procambium, and characterized by weblike or pitted surfaces and broader tracheary elements than the protoxylem
Supplement
In vascular plants, the major conducting tissues are xylem and phloem. The xylem tissues may be classified as primary or secondary depending on where they are derived. The primary xylem is the type of xylem produced from the primary growth. It differentiates into two parts: (1) protoxylem and (2) metaxylem. The protoxylem is the first one to form followed by the metaxylem (thus, the name). Both protoxylem and metaxylem are found in the primary vascular bundle, and involved in the conduction of water and minerals towards the apical shoot. They are produced by the procambium. Both of them contain tracheids, vessels, and parenchyma. However, the metaxylem has more tracheary elements than the protoxylem. Furthermore, the lumen of tracheary elements of the metaxylem is larger than that of the protoxylem. This makes the metaxylem more efficient in conduction than the protoxylem. The metaxylem also has few fibers, which are lacking in protoxylem. It is not capable of stretch (unlike protoxylem). However, it is not subjected to strain or stress.
Word origin: meta– (“later”) + xylem, from Greek xúlon (“wood”)
See also:


You will also like...

Ploidy
Polyploidy

Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howeve..

Population Growth and Survivorship
Population Growth and Survivorship

This lesson looks at population attributes, regulation, and growth. It also covers population genetics, particularly gen..

3D rendering of an antibody
Passive and Active Types of Immunity

Lymphocytes are a type of white blood cell capable of producing a specific immune response to unique antigens. In thi..

temperature - abiotic factor
Abiotic and Biotic Factors

This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..

mRNA
Protein Synthesis

Part of the genetic information is devoted to the synthesis of proteins. mRNA, a type of RNA, is produced as a transcri..

Genetics – Lesson Outline & Worksheets
Genetics – Lesson Outline & Worksheets

  Topics Modules Quizzes/Worksheets Description Introduction to Genetics Genetics – Definition: Heredity and ..

Related Articles...

No related articles found

See all Related Topics