EMISSION OF SULFUR-DIOXIDE FORM SULFITE-TREATED BIRCH LEAVES

In the present paper, we report the emission of SO2 from 10 mM sulfite -treated birch (Betula papyrifera Marsh) leaves both in light and in t he dark. The emission reaches maximum at around 60 min during treatmen t. In some leaves, maximum emission is noticed even after 5 to 10 min of initiation of sulfite treatment. It is also observed in the presenc e of 3-(3,4-dichlorophenyl)-1-1 dimethylurea (DCMU). However, the emis sion rates are higher in light than in the dark or in the presence of DCMU. This emission is not observed with sulfate-treated leaves.