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Lignin

Lignin

(Science: plant biology) organic substance which act as a binder for the cellulose fibres in wood and certain plants and adds strength and stiffness to the cell walls.

The chemical structure of lignin is composed of a complex polymer of phenylpropanoid subunits, laid down in the walls of plant cells such as xylem vessels and sclerenchyma. It imparts considerable strength to the wall and also protects it against degradation by microorganisms. It is also laid down as a defence reaction against pathogenic attack, as part of the hypersensitive response of plants. A complex polymer; the chief non-carbohydrate constituent of wood; binds to cellulose fibers to harden and strengthen cell walls of plants.A compound found in cell walls, and this non living component provides a structural function in xylem and bark in plants.


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What is pectin, hemicellulose and lignin and....???

... I know the primary cell wall of plants contains more amount of cellulose, pectin and hemicellulose and secondary cell wall contains more lignin, but I can't seem to understand their significance there...like what role, specific to only plant cell wall, in relation to their structure do ...

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by NarutardedNinja
Thu Sep 26, 2013 4:06 pm
 
Forum: Cell Biology
Topic: What is pectin, hemicellulose and lignin and....???
Replies: 1
Views: 860

Queries about botany Qs

My guess would be pectin http://en.wikipedia.org/wiki/Pectin http://en.wikipedia.org/wiki/Lignin http://en.wikipedia.org/wiki/Cellulose try to look here: http://www.botany.hawaii.edu/faculty/webb/BOT311/bot311-00/Roots/ApicalMeristems.htm from what I understood it seems ...

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by JackBean
Tue Jul 06, 2010 1:44 pm
 
Forum: Botany Discussion
Topic: Queries about botany Qs
Replies: 1
Views: 1869

Queries about botany Qs

Does the root cap originate from the quiscent centre or from the root epidermis? Also which one is a hydrated polymer- cellulose , pectin or lignin?

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by aleena1607
Tue Jul 06, 2010 10:35 am
 
Forum: Botany Discussion
Topic: Queries about botany Qs
Replies: 1
Views: 1869

Ferns and their life cycle

... typed life cycle of ferns in google, it'd be easier than asking some questions straight out of a book. As for the second part though, because the lignin is what gives the cell walls of the plants their rigidity, thus causing them to be able to hold more weight on itself. And if you can't figure ...

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by EronJonson
Fri Feb 26, 2010 2:20 am
 
Forum: Botany Discussion
Topic: Ferns and their life cycle
Replies: 7
Views: 7640

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 ...

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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: 2283
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