Uncoupling of stomata and photosynthesis
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When CO2 concentration is elevated, photosynthesis reaches its maximum quickly, while transpiration declines gradually as the stomata slowly close. The closing of the stomata does not affect photosynthesis, suggesting CO2 diffuses into the leaf through other means besides the stomata. The theoretical Ci parameter used to relate photosynthesis, transpiration and leaf temperature is incorrect because the real internal CO2 concentration inside the leaf is independent of stomatal conductance and does not decline, keeping photosynthesis at a steady state. Charts should directly plot CO2 concentration against photosynthesis and transpiration separately.
Uncoupling of stomata and photosynthesis
- 1. 7/31/2021 387DOH_TEXT_0617987_31_07_2021_1_45.HTM file:///C:/Z/Dohot/DOH_TEXT_0617987/387DOH_TEXT_0617987_31_07_2021_1_45.HTM 1/3 Uncoupling of photosynthesis and transpiration When CO2 conentration is elevated, the Photosynthesis reaches the maximum almost insentaneously... And the transpiration, declines gradually. The stomata close slowly..During the closure of the stomata, the Photosynthesis remains in steady state. The stomata don't affect photosynthesis, suggesting that the CO2 diffuses not through the stomata. The theoretical Ci parameter, is calculated from transpiration, and related to photosynthesis and leaf temperature, however the real intercellular CO2 concentration is not related to stomata and doesn't decline, and so, the Photosynthesis remains in steady state...So, the Ci parameter is wrong, and there is no reason to present the Ci in the chart. The chart should be CO2 in the surroundings vs Photosynthesis and another chart the CO2 in the surroundings vs the transpiration..