[Tree stomatal infiltration and SO2 injury and protection effect of ABA]

This paper deals with relation between tree stomatal infiltration and SO2 injury and the protection effect of ABA. Experiments of SO2 smoking to the selected trees were carried out and the data were collected in the field. The results show that stomatal infiltration was a comparably constant index for certain tree species. The infiltration of trees is negatively correlated with the combine extent of chlorophy, but not obviously. The index is also positively correlated with K+ efflux in leaf(r = 0.92, alpha < 0.01). In the experiment of SO2 smoking, the effect on infiltration of same species under different SO2 concentration was little, less than one grade, while K+ efflux increased with the increment of SO2 amount absorbed by the leaves. When the leaves were sprayed with ABA solution, the higher the ABA solution concentration was, the lower the K+ efflux was. When leaves sprayed with ABA solution were smoked with 2.5 mol.L-1 for four hours, the infiltration of leaves with 30 mol.L-1 ABA solution dropped 1.5-3 and K+ concentration decreased 36.5%-54.8% on leaves. It indicates that the ABA solution on leaves has remarkable effect of protection of SO2 injury.