Chloroplast fine structure in the japonica-2 maize mutant exposed to continuous illumination. 2. The white tissues.

Exposure to continuous illumination causes an enhancement of thylakoid swelling in the mesophyll chloroplasts of the white tissues of the japonica-2 maize mutant. In the bundle sheath plastids the effects of continuous illumination are striking and intriguing, because a regular honeycomb-like fret of membranes is formed from a provesicular body. No interpretation of this fret of membranes is, at present, possible.