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Growth rings in granules developed under different environmental conditions. Scale bars on A and G represent 10 μm; all other scale bars represent 5 μm. A and B, Plant grown in 16 h of light at 18°C and 8 h of dark at 15°C. C and D, Plant grown in constant light and constant temperature (18°C). E and F, Microtuber grown in continuous darkness at 25°C for 12 to 16 weeks. G, Plant grown in 20 h of light at 18°C and 20 h of dark at 15°C.
