TRANSLOCATION OF C¹⁴‐LABELED PHOTOSYNTHATE IN NODULATED LEGUMES AS INFLUENCED BY NITRATE NITROGEN

Abstract

Translocation of C 14 ‐labeled photosynthate was studied in nodulated pea and subterranean‐clover plants which were grown either continuously without combined nitrogen or exposed to NaNO 3 in the nutrient solution for five days prior to C 14 O 2 assimilation. Supplying combined nitrogen decreased the proportion of photosynthate translocated to nodules with a corresponding increase in the proportion going to roots. Nodules on plants grown without combined nitrogen had a higher radioactivity than nodules on plants treated with sodium nitrate.