page_title: Thylakoid
hierarchical_section_title: Thylakoid
context_page_description: Thylakoids are membrane-bound compartments inside chloroplasts and cyanobacteria. They are the site of the light-dependent reactions of photosynthesis. Thylakoids consist of a thylakoid membrane surrounding a thylakoid lumen. Chloroplast thylakoids frequently form stacks of disks referred to as grana. Grana are connected by intergranal/ stroma thylakoids, which join granum stacks together as a single functional compartment.
context_section_description: Thylakoids are membrane-bound compartments inside chloroplasts and cyanobacteria. They are the site of the light-dependent reactions of photosynthesis. Thylakoids consist of a thylakoid membrane surrounding a thylakoid lumen. Chloroplast thylakoids frequently form stacks of disks referred to as grana (singular: granum). Grana are connected by intergranal/ stroma thylakoids, which join granum stacks together as a single functional compartment.
caption: Components of a typical chloroplast
  1 Granum
  
  2 Chloroplast envelope
  
  
  2.1 Outer membrane
  
  2.2 Intermembrane space
  
  2.3 Inner membrane
  
  3 Thylakoid   ◄ You are here
  
  
  3.1 Thylakoid space (lumen)
  
  3.2 Thylakoid membrane
  
  4 Stromal thylakoid
  
  5 Stroma
  
  6 Nucleoid (DNA ring)
  
  7 Ribosome
  
  8 Plastoglobulus
  
  9 Starch granule