It has not been clear how salt halts the growth of the plant-root system, until now. According to an international study published in the journal Plant Cell, an inner layer of tissue in the branching roots that anchor the plant is sensitive to salt and activates a stress hormone, which stops root growth. This is a microscope image of a branching root, the cell boundaries are in red and the GFP fluorescent signal marks the endodermis (José Dinneny) Salt...
