1: Response of carboxylation to CO 2 for wheat (Triticum aestivum) at 1% and 21% O 2, upper and lower solid lines respectively, selected from the minimum of Michaelis-Menten equation (-.- lines), for the transitional rates and equation 39 (-- lines) for step 2 limitation. ryuichi ishii, toshiroh takehara, yoshio murata, shigetoh miyachi, effects of light intensity on the rates of photosynthesis and photorespiration in c3 and c4 plants, biological solar energy conversion, 10.1016/b978-0-12-500650-7.50025-8, (265-271), (1977). Oxygen sensitivity is calculated as described in the text. At a very high oxygen concentration, the rate of photosynthesis begins to decline in all the plants. This means that, at relatively low concentrations of CO 2 , the delivery of carbon into photosynthesis products is more efficient than in C3 plants and oxygenation doesn’t occur. The phenomenon is called “Warburg effect.” PEP carboxylase has a lower K m for CO 2 than does Rubisco. Concentration of oxygen does not have any inhibitory role in C4 cycle. B) C3 plants will have faster growth; C4 plants will be minimally affected. C 4 photosynthesis has a number of distinct properties that enable the capture of CO 2 and its concentration in the vicinity of Rubisco, so as to reduce the oxygenase activity of Rubisco, and hence the rate of photorespiration. Oxygen. Repeat at different lower CO2 concentrations by using different dilutions of a saturated solution. What would be the expected effect on plants if the atmospheric CO2 concentration was doubled? A) All plants will experience increased rates of photosynthesis. Graph the results placing CO2 concentration … The gas should be checked to prove that it is indeed oxygen - relights a glowing splint. Increased oxygen concentration has an inhibitory effect on C3 cycle. The effect of oxygen on photosynthesis depends on plant species and on some internal and environmental conditions. The effect of changing the oxygen concentration from 21 to 2% on photosynthesis of wheat, sunflower, and soybean was investigated. Abstract. C4 cycle requires 30 ATP molecules to synthesize one molecule of glucose. Oxygen inhibits the photosynthesis of C 3 plants at atmospheric CO 2 concentration (Warburg effect). This is demonstrated by the work of McAlister and Myers (1940) showing the effect of high and low concentrations of oxygen on the rate of photosynthesis of wheat plants. Abstract. 4. C) C4 plants will have faster growth; C3 plants will be minimally affected. 11: C3 cycle requires 18 ATP molecules to synthesize one molecule of glucose. The theoretical oxygen sensitivity assuming an ribulose bisphosphate (RuBP) regeneration limitation on net CO 2 assimilation (A) is shown as the thick grey curve. The normal atmospheric concentration of oxygen is high enough to induce a lower rate of photosynthesis than obtains at lower concentration of oxygen. 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