Spatially Heterogeneous Cadmium Exposure Reduces Toxicity in Soybean Through Complementary Root‐Sector Functions in Cadmium Defence and Nitrate Acquisition

Summary Statement Relative to uniform Cd exposure, spatially heterogeneous exposure recruits complementary soybean root‐sector functions: the high‐Cd sector concentrates Cd entry and defence, whereas the low‐Cd sector sustains nitrate acquisition and shows shoot‐connection‐dependent Cd efflux, together reducing whole‐plant Cd toxicity.