Stroma

Definition

The stroma is the fluid-filled space surrounding the grana (stacks of thylakoids) within the chloroplast where the "dark" reactions of photosynthesis (Calvin cycle) occur.

Related terms

Chloroplasts:

Organelles found in plant cells where photosynthesis occurs.

Grana:

Stacks of thylakoids located within the chloroplasts where light-dependent reactions occur.

Calvin Cycle:

The set of chemical reactions that take place in chloroplasts during photosynthesis, converting carbon dioxide into organic compounds.