トウモロコシおよびナスにおける茎径変化,蒸散,気孔開孔率

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  • トウモロコシ オヨビ ナス ニ オケル ケイケイ ヘンカ ジョウサン キコウカイコウリツ

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Abstract

Changes in stem diameters of corn and egg-plant were measured by a micro-displacement detector. At the same time, transpiration rates (ml/10 min.) were estimated by an electric balance. Stomata of corn and egg-plant were also observed under microscope after the replicas of stomata had been made by giving a coat of nail polish to the leaves of corn and egg-plant. The following results were obtained. 1. The stems of both corn and egg-plant started to shrink when sunshine began, and they started to recover when sunshine reached maximum. In the night, the stem diameters increased. 2. Variation patterns of the transpiration rates in both plants were the same with that of solar radiation, and increases in the stem diameters changed with increases in transpiration rates. In the night, almost no transpiration was observed. 3. Percentage in the number of open stomata to total number of stomata showed positive correlation with the transpiration rate in both corn and egg-plant. In corn, almost all stomata were closed in the night, but in the case of egg-palnt, approximately a half of total number of stomata was open.

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