Desert plants are not adapted to survive in saline/ aquatic conditions.
Plants are conformers/stenothermal/cannot maintain constant internal environment/temperature/osmotic concentration of the body fluids affects kinetics of enzymes through basal metabolism/activity and other physiological functions of the organisms.
Detailed Answer :
In mangroves the soil is deficient of oxygen because of the presence of excess of water in it. Mangroves plants develop special apogeotropic root called Pneumatophores for respiration as an adaption. Such an adaption is not found in desert plants therefore they are not found in mangroves.
