Under water shortage conditions, intercropping increased the IWUE of castor bean in relation to monocropping, due mainly to an increase in A and the consequent increase in carboxylation efficiency and maintenance of transpiration rates, as shown by the significant correlation between these variables (R = 0.
Regarding carboxylation efficiency (Figure 5 d-f), a smiliar behave to liquid photosynthetic net was observed, and the reduction in A/Ci ratio is probably due to damage in the biochesmistry reactions of photosynthesis.
We fitted the A versus internal carbon concentration (C) data following Ethier and Livingston (2004) version of Farquhar's model (Farquhar, von Caemmerer, & Berry, 1980) to extract different leaf biochemical parameters: maximum rate of carboxylation ([V.
Many studies have used stomatal conductance as a reference parameter which explain the gradual response to water stress which first acts as a partial closure leading to a metabolic adjustment through limited generation of ribulose-l, 5-bisphosphate (RuBP) and thereafter as the drought stress progressed, the closure of stomatal leads to reduced photochemistry and then carboxylation efficiency (Rennenberg et al.
26] Disruption of the glycocalyx therefore causes capillary leakage and predisposes the endothelial cells to oxidative stress-induced disruption, when endothelial cell tight junctions may be damaged by mechanisms such as protein modification, thiol-oxidation, phosphorylation, nitration and carboxylation during sepsis.