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Secondary xylem

Definition

noun

The xylem formed as a result of secondary growth from vascular cambium.


Supplement

Secondary xylem is absent in non-woody plants and is present in trees and shrubs. Its cell walls are thickened by deposition of lignin, thereby, rendering mechanical support to such plants. Secondary xylem consists of large sized tracheids and vessels.


Compare: primary xylem


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Question on Xylem and Phloem; primary and secondary

... my question. "What is the difference in the formation of primary xylem and phloem versus secondary xylem and phloem?" What I put/am thinking, is that primary x&p is formed ...

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by naturalgoats
Wed Nov 23, 2011 7:43 pm
 
Forum: Botany Discussion
Topic: Question on Xylem and Phloem; primary and secondary
Replies: 2
Views: 5797

Transport In Plants

The first answer to the question: Both xylem and phloem are vascular tissues found in a plant. Xylem is a tubular structure ... also (ALFIERI, F. J., and R. F. EVERT. 1968. Seasonal development of the secondary phloem in Pinus. Am. J. Bot. 55, 518-528.) It consists of sieve cells , ...

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by kika
Tue Aug 02, 2011 10:40 am
 
Forum: Botany Discussion
Topic: Transport In Plants
Replies: 3
Views: 10308

Secondary walls in tracheary elements

I hope somebody can help me out here. I understand that secondary walls are laid in xylem tissue in one of the following ways: annular thickenings, helical thickenings, scariform thickenings, ...

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by botanygirl
Mon Nov 10, 2008 7:50 pm
 
Forum: Botany Discussion
Topic: Secondary walls in tracheary elements
Replies: 0
Views: 2650

need an answer

... several cell layers deep. Whereas the vascular cambium produces both secondary xylem(sapwood/heartwood) and secondary phloem(inner bark). Hope this helps :)

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by botanygirl
Thu Oct 25, 2007 2:47 pm
 
Forum: Botany Discussion
Topic: need an answer
Replies: 5
Views: 5251
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