Abstract
Stepwise increases in fluorescent illuminance, imposed as a single variable in a controlled environment, induced progressive stomatal opening in 8 plant species, as evidenced by a consistent decrease in leaf diffusion resistance (R(L)), ranging from 15 to 70 sec cm(-1) in darkness to about 1 sec cm(-1) at approximately 40 kilolux. The minimum R(L) values were the same for the upper and the lower epidermis, provided that stomatal density was adequate. Saturation illuminance was not achieved in any species; extrapolation indicates that 50 kilolux would bring about full stomatal opening (R(L) </= 0.1 sec cm(-1)).In 4 species, reasonable agreement was obtained in a controlled environment between transpiration as measured by weight loss and that calculated from determination of (a) the difference in water vapor density from leaf to air, (b) the boundary layer resistance, and (c) the leaf diffusion resistance. This result confirms the physical validity of the resistance measurement procedure.
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Claims 5
Claim · model-written summary
Stepwise increases in fluorescent illuminance decreased leaf diffusion resistance in 8 plant species, from 15 to 70 sec cm(-1) in darkness to about 1 sec cm(-1) at about 40 kilolux.
Verbatim
e1“Stepwise increases in fluorescent illuminance, imposed as a single variable in a controlled environment, induced progressive stomatal opening in 8 plant species, as evidenced by a consistent decrease in leaf diffusion resistance (R(L)), ranging from 15 to 70 sec cm(-1) in darkness to about 1 sec cm(-1) at approximately 40 kilolux”
Claim · model-written summary
Minimum leaf diffusion resistance values were the same for the upper and lower epidermis when stomatal density was adequate.
Verbatim
e1“Stepwise increases in fluorescent illuminance, imposed as a single variable in a controlled environment, induced progressive stomatal opening in 8 plant species, as evidenced by a consistent decrease in leaf diffusion resistance (R(L)), ranging from 15 to 70 sec cm(-1) in darkness to about 1 sec cm(-1) at approximately 40 kilolux”
e2“The minimum R(L) values were the same for the upper and the lower epidermis, provided that stomatal density was adequate”
Claim · model-written summary
Saturation illuminance was not reached in any of the 8 plant species tested.
Verbatim
e1“Stepwise increases in fluorescent illuminance, imposed as a single variable in a controlled environment, induced progressive stomatal opening in 8 plant species, as evidenced by a consistent decrease in leaf diffusion resistance (R(L)), ranging from 15 to 70 sec cm(-1) in darkness to about 1 sec cm(-1) at approximately 40 kilolux”
e3“Saturation illuminance was not achieved in any species”
Claim · model-written summary
Extrapolation indicates that 50 kilolux would bring about full stomatal opening in the 8 plant species.
Verbatim
e1“Stepwise increases in fluorescent illuminance, imposed as a single variable in a controlled environment, induced progressive stomatal opening in 8 plant species, as evidenced by a consistent decrease in leaf diffusion resistance (R(L)), ranging from 15 to 70 sec cm(-1) in darkness to about 1 sec cm(-1) at approximately 40 kilolux”
e4“extrapolation indicates that 50 kilolux would bring about full stomatal opening”
Claim · model-written summary
Transpiration measured by weight loss showed reasonable agreement with calculated transpiration in 4 species in a controlled environment.
Verbatim
e5“In 4 species, reasonable agreement was obtained in a controlled environment between transpiration as measured by weight loss”