under what condition the affinity of rubp carboxylase for co2 and o2 ncrease ?
RuBP Carboxylase-Oxygenase (Ribulose- 1, 5-bisphosphate Carboxylase-Oxygenase) is also called RUBISCO. It is the most abundant enzyme complex found on the earth. It can act on the two substrates: Carbon dioxide ( for carbon dioxide assimilation into glucose during photosysntheis) and Oxygen ( causing photorespiration , decreasing the photosynthetic efficiency of plants) . The competition between their Carboxylase-Oxygenase activity is dependent upon the relative concentration of carbon dioxide and oxygen and affinity of RUBISCO for these gases. Fortunately, RUBISCO has more affinity (80 times more) for carbon dioxide than oxygen. Under higher concentration condition of carbon dioxide than oxygen, obviously RUBISCO shows its carboxylase activity . While, under very concentration condition of oxygen than carbon dioxide , RUBISCO may shows its oxygenase activity.