Carbon sink strength of nodules but not other organs modulates photosynthesis of faba bean (Vicia faba) grown under elevated [CO₂] and different water supply

Summary Photosynthetic stimulation by elevated [CO 2 ] (e[CO 2 ]) may be limited by the capacity of sink organs to use photosynthates. In many legumes, N 2 ‐fixing symbionts in root nodules provide an additional sink, so that legumes may be better able to profit from e[CO 2 ]. However, drought not only constrains photosynthesis but also the size and activity of sinks, and little is known about the interaction of e[CO 2 ] and drought on carbon...