Effect of Irradiance on Partitioning of Photosynthate to Pea Root Nodules

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Abstract
Apparent N2 fixation and partitioning of recently formed 14C-photosynthate were compared in ''Alaska'' peas grown under 200, 500 or 800 .mu.E/m2 per s with plants grown under 500 .mu.E/m2 per s and exposed to 200, 500 or 800 .mu.E/m2 per s for 10 h. Plants grown under higher irradiance reduced more C2H2 and partitioned a greater fraction of translocated 14C-photoassimilate to root nodules than plants grown under lower light energy. Plants grown at 500 .mu.E/m2 per s and exposed to 200, 500 or 800 .mu.E/m2 per s for 10 h showed no significant difference in acetylene reduction or photosynthate partitioning. Irradiance levels may affect pea root nodule activity by long-term alterations of plant development rather than by a short-term increase in photosynthate translocated to root nodules.

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