EEB428H1 Lecture Notes - Lecture 3: Crassulacean Acid Metabolism, Stomatal Conductance, Carbonic Anhydrase
22 Feb 2016
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300ppm are peak periods of interglacial and 180ppm troughs were glacial periods. Mean values ~96% bellow 280ppm, 240ppm (67%) In recent history, the mean ppm is lower than what we are experiencing now. Rising co2 has direct effects on stomatal conductance, mitochondrial, and rubisco carboxylation which increases net photosynthesis. This, combined with water availability has positive effects on the plants health and photosynthetic performance. Because of these direct effects, the carbon and water balance of plants is altered leading to secondary effects on growth, resource partitioning and defense compound synthesis. Reduced investment in photosynthetic protein is one of the characteristic acclimation responses of plants to high. Operate below co2 saturation, so co2 responsive. Suffer from photorespiration in warm temperature since rubisco is co2 sensitive. Use the c4 photosynthetic co2 concentrating mechanism. Crassulacean acid metabolism to concentration co2 around rubisco. Slow growth, but very high water use efficiency.
