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Metaxylem

Definition

noun

The xylem that is last to form or develop, characterized by broader tracheary elements and weblike or pitted surfaces.


Supplement

The metaxylem forms later after protoxylem has formed. In a young stem, the protoxylem consists of tracheary element with annular or spiral thickenings, hence, capable of stretching or elongating (for stem growth). As the stem gets older, the stem stops elongating and the tracheary elements become more filled in.


Compare: primary xylem


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question about position of proto and meta xylem in plant

My guess is that as the name suggests, protoxylem is formed first and hence has more lignin deposition over time than the Metaxylem that forms later during a plant's growth. It is due to this that protoxylem has a narrower lumen due to excess lignification. As for their relative positions, ...

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by SauronTheConqueror
Thu Jan 21, 2010 3:33 pm
 
Forum: Botany Discussion
Topic: question about position of proto and meta xylem in plant
Replies: 1
Views: 2572

question about position of proto and meta xylem in plant

why protoxylem occur outside in roots and inside in stems and vice versa with metaxylem . is there any relation of them with the functions , then pls tell there separate functions

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by karanmaster0007
Thu Oct 22, 2009 1:32 pm
 
Forum: Botany Discussion
Topic: question about position of proto and meta xylem in plant
Replies: 1
Views: 2572

what are the functions of protoxylem and metaxylem ?

i am really stuck , and i want to know why in roots exarch conditions , and in stems endarch is found ? pls tell , urgent :? :? :? :? :? :? :mrgreen:

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by karanmaster0007
Thu Oct 22, 2009 1:28 pm
 
Forum: Botany Discussion
Topic: what are the functions of protoxylem and metaxylem ?
Replies: 1
Views: 2509


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