Correlation between Internal Surface and Transpiration Rate in Mesomorphic and Xeromorphic Leaves Grown under Artificial Light

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Abstract
Transpiration rates of periwinkle (Vinca rosea) and oleander (Nerium oleander) plants grown under low intensity (86 to 300 ft.-candles) and high intensity (301-965 ft.-candles) of artificial light were measured when the plants were in the light intensity in which they were grown, when all plants were in low intensity, and when all plants were in high light intensity. The correlation coeffs. between transpiration rate and the internal/external surface ratios (R) ranged from +0.85 to +0.89 under the 3 conditions and were highly significant when all the plants were considered as a group. Oleander leaves had higher R''s and transpired more per unit internal surface than periwinkle leaves.