THE FLUX OF ATMOSPHERIC H2S TO SPINACH LEAVES CAN BE AFFECTED BY THE SUPPLY OF O-ACETYLSERINE

H2S can be actively taken up and metabolized by plant leaves and at hi gh atmospheric concentrations, its flux to shoots was limited by the i nternal resistance of the leaves to H2S. Feeding of O-acetylserine, th e substrate for O-acetylserine sulfurylase, to detached leaves resulte d in a decreased internal resistance of the leaves, and hence an incre ased H2S flux to the leaves. This demonstrated that the flux of H2S to leaves is determined by its metabolism.