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#1
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photosynthesis as a sucking force factor
Hello,
I'm searching for any tip about the importance of photosynthetical utilisation of water in the whole sucking force of leaves. Does oxygen production contribute to the osmotic potential of xylem, and therefore to water absorption in roots? I don't need any quantitative information, a simple yes/no would satisfy me as long as it's based on facts. I'll be very grateful for your help Best regards, e. |
#2
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photosynthesis as a sucking force factor
Emilia Jarochowska schreef
I'm searching for any tip about the importance of photosynthetical utilisation of water in the whole sucking force of leaves. Does oxygen production contribute to the osmotic potential of xylem, and therefore to water absorption in roots? I don't need any quantitative information, a simple yes/no would satisfy me as long as it's based on facts. I'll be very grateful for your help Best regards, + + + Afraid I don't have any numbers, but I never heard that the water used up by photosynthesis is worth mentioning when compared to water lost in evaporation. PvR |
#3
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photosynthesis as a sucking force factor
Emilia Jarochowska wrote in message ...
Hello, I'm searching for any tip about the importance of photosynthetical utilisation of water in the whole sucking force of leaves. Does oxygen production contribute to the osmotic potential of xylem, and therefore to water absorption in roots? I don't need any quantitative information, a simple yes/no would satisfy me as long as it's based on facts. I'll be very grateful for your help Best regards, e. No, dissolved oxygen would not affect osmotic potential, which is a component of water potential. Dissolved solids, such as potassium ions or sugars such as sucrose do lower the osmotic potential. Water moves in the xylem in response to the water potential gradient. Movement is from higher to lower (more negative) water potential. Most of the oxygen is going to exit the stomata, not dissolve in the xylem anyway. The main association of photosynthesis with water transport in the xylem is that the opening of stomata, which is required for photosynthesis, creates a huge water potential gradient from the leaf intercellular spaces to the atmosphere. The leaf intercellular spaces have virtually 100% relative humidity and zero water potential. The atmosphere typically has a very negative water potential. The following webpage has the equation to calculate water potential from the relative humidity: http://www.decagon.com/tru_psi/water...al%20info.html David R. Hershey |
#4
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photosynthesis as a sucking force factor
David Hershey schreef
Most of the oxygen is going to exit the stomata, not dissolve in the xylem anyway. + + + Xylem is carrying water upwards and nothing much could dissolve in the water anyway, not against the current. PvR |
#5
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photosynthesis as a sucking force factor
David Hershey schreef
Most of the oxygen is going to exit the stomata, not dissolve in the xylem anyway. + + + Xylem is carrying water upwards and nothing much could dissolve in the water anyway, not against the current. PvR |
#6
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photosynthesis as a sucking force factor
David Hershey schreef
Most of the oxygen is going to exit the stomata, not dissolve in the xylem anyway. + + + Xylem is carrying water upwards and nothing much could dissolve in the water anyway, not against the current. PvR |
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