Abstract
Translocation of photoassimilated 14CO 2 by individual leaves of Agropyron smithii was stimulated by exposure of tillers to 200 μg m −3 SO 2. In response to increased sink demand of expanding leaves, labeled leaves exposed to SO 2 exported an average of 12% more carbon than control leaves. The relative concentration and relative partitioning of 14C in developing leaves was 177 and 153% greater, respectively, in tillers on the SO 2 treatment than in control tillers. Below-ground 14C concentrations were greater in SO 2-exposed tillers only on the early-growing-season sampling date. The concurrent increase in translocation to above-ground sinks in tillers exposed to SO 2 and of relative rhizome 14C concentration indicates a stimulation in reproductive and leaf growth with 200 μgm −3 SO 2. Productivity, photosynthetic, and 14C-partitioning responses were compared in monitoring the subtle effects of low-level SO 2 exposure.
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