| Comments |
"The cylindrical stacks
of appressed membranes correspond to the grana
structures described by A. Meyer. The non-stacked
thylakoids are known as stroma thylakoids, because
they are in direct contact with the stroma. According
to this definition, the top and bottom membranes of
the grana stacks are also stroma thylakoids. Mature
chloroplasts may contain 40 to 60 grana stacks with
diameters of 0.3 to 0.6µm. The number of thylakoids
per stack in mature thylakoids varies from
<10 in high
light chloroplasts to as many as 100 thylakoids in the
extreme shade plant
Alocasia macrorhiza
(Goodchild et al. 1972)." |