Plant response to salinity
Plant roots are capable of detecting stressful concentrations of salt and sending this information to the shoots via calcium waves.
In the root these waves move through the cortical and endodermal cell layers at speeds of up to 400 µm/s, i.e., traversing several cells per second. This Ca2+ wave system correlates with the triggering of molecular responses in distant parts of the plant upon perception of localized (salt) stress. Such propagating Ca2+ waves provide a new mechanism for the rapid integration of activities throughout the plant body (Choi et al., 2014).
Fun fact, did you know Mars is covered in salt?
Below: Analysis of natural variation of plants to agricultural stresses such as salinity reveal new genetics or "accessions" of plants that are resistant to the stresses off future agro-ecosystems on Earth and /or on Mars.