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Protoxylem

Definition

noun

The first xylem to develop, characterized by narrow tracheary elements with annular, spiral or reticular thickenings.


Supplement

In young plants, the protoxylem in stems has very little secondary wall material as it is mostly involved in stretching or stem elongation.


Compare: metaxylem


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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 ...

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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: 2630

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: 2630

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: 2550


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