«Two weeks after flooding treatment with simulated salt water,
net photosynthetic rate of broccoli, kale, spinach, and tomato was reduced by 43 % to 67 %, transpiration rate by 35 % to 66 %, and stomatal conductance by 51 % to 82 %.»
Under these conditions the
rate may only slightly exceede the respiration
rate, so the
net photosynthetic production by the cells is actually very poor.