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Crassulacean acid metabolism

Definition

noun

An elaborate carbon fixation pathway in which the stomata are open in cooler and more humid night-time hours, permitting the uptake of CO2 to be fixed and stored as a four-carbon acid (i.e. malate) so that during the hotter and drier day-time hours the CO2 is released providing the enzyme rubisco with high concentration of CO2 while the stomata are closed to reduce water loss through evapotranspiration.


Supplement

The pathway renders plants able to thrive and adapt in arid environments. CAM was first observed by the botanists, Ranson and Thomas, in the Crassulaceae family of succulents.


Word origin: from the Crassulaceae family of succulent plants where it was first observed.

Abbreviation: CAM.

Compare: C3 carbon fixation pathway, C4 carbon fixation pathway.
See also: CAM plant.


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CAM and fotorespiration

... C4 plants, but by a different process. Look up crassulacean acid metabolism for details.

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by Cat
Thu Mar 13, 2008 2:08 am
 
Forum: Cell Biology
Topic: CAM and fotorespiration
Replies: 3
Views: 2551

how do halophytes tolerate salty environments?

... under salinity; U. Lüttge. 17. Induction of Crassulacean acid metabolism by salinity &endash; molecular aspects; H.J. Bohnert. ...

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by Linn
Wed Nov 22, 2006 11:47 pm
 
Forum: Botany Discussion
Topic: how do halophytes tolerate salty environments?
Replies: 4
Views: 4078

what is CAM ?

Crassulacean acid metabolism (CAM) occurs in many plants that live in dry habitats. CAM plants ...

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by Methamphetamine
Sat Apr 01, 2006 8:59 am
 
Forum: Botany Discussion
Topic: what is CAM ?
Replies: 6
Views: 3395

<~ö All about cacti ö~>

Cacti don't release CO2 @ night. They use crassulacean acid metabolism (forgive my spelling). They, along with other succulents ...

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by uga hort nerd
Wed Nov 23, 2005 3:56 am
 
Forum: Botany Discussion
Topic: <~ö All about cacti ö~>
Replies: 24
Views: 10274


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