An official website of the United States government.

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Concept Breadcrumbs

Preferred Term:

Crassulacean acid metabolism

Biochemical pathway where the initial carbon fixation occurs in the outer mesophyll cells during the night when the stomates are open. When stomates are closed during the day, the C4 acids are transferred from vacuoles to the chloroplasts where the Calvin cycle occurs to produce glucose.
Concept Schemes:
Broader Concept:
Entry Terms:
  • CAM photosynthesis
  • CAM pathway
Download this Concept:
RDF/XMLCreated 2006-01-19, last modified 2017-05-26