Repeat at different lower CO2 concentrations by using different dilutions of a saturated solution. Graph the results placing CO2 concentration … This is the rate of photosynthesis at that particular concentration of CO2. The effect of changing the oxygen concentration from 21 to 2% on photosynthesis of wheat, sunflower, and soybean was investigated. Concentration of oxygen does not have any inhibitory role in C4 cycle. Oxygen. 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. Fig. 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. C3 plants show optimum photosynthesis at low oxygen concentration. The theoretical oxygen sensitivity assuming an ribulose bisphosphate (RuBP) regeneration limitation on net CO 2 assimilation (A) is shown as the thick grey curve. 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. The phenomenon is called “Warburg effect.” At a very high oxygen concentration, the rate of photosynthesis begins to decline in all the plants. The normal atmospheric concentration of oxygen is high enough to induce a lower rate of photosynthesis than obtains at lower concentration of oxygen. 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. C) C4 plants will have faster growth; C3 plants will be minimally affected. Abstract. Oxygen sensitivity is calculated as described in the text. Further, O 2 is a very poor substrate for this enzyme. The oxygen sensitivity of photosynthesis in Scrophularia desertorum and Populus fremontii growing naturally in a field near Reno, NV, USA. Oxygen inhibits the photosynthesis of C 3 plants at atmospheric CO 2 concentration (Warburg effect). PEP carboxylase has a lower K m for CO 2 than does Rubisco. C4 cycle requires 30 ATP molecules to synthesize one molecule of glucose. Abstract. Green plants and algae use light energy to make glucose and oxygen from carbon dioxide and water. Increased oxygen concentration has an inhibitory effect on C3 cycle. 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). 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