| Popis: |
Background: Rice is a salt-sensitive crop, and salinity is a major negative constraint on rice production, while light has a major positive effect on plant growth and development. How plants integrate the external salinity and light signals remains poorly understood. Results: Here, we demonstrated that light exposure enhanced the cation (Na+, K+, H+, and Ca2+) efflux from the rice (Oryza sativa L.) root for both salt-free and NaCl-treated rice. Surprisingly, net flux of Na+, J(Na+), in NaCl-treated rice was inverted in the light-on state. This inverted light-inducible J(Na+) signal suggests crosstalk between salt stress and light signals, with salt stress interfering with Na+ transport via down regulation of the light receptors. PPI network of this crosstalk suggested that there were key players, phytochrome A and B, phototropin 1A and 1B, and 2 at the bridging group and AKT1 potassium channel, monovalent cation/H+ antiporter and Na+/K+ antiporter (SOS1) at the interface between bridging group and cation transport group. Conclusions: Crosstalk between light and salt stress caused the inverted light-inducible J(Na+) signals. Phytochrome A and B, phototropin 1A and 1B, and 2 at the light-responding group and AKT1 potassium channel, monovalent cation/H+ antiporter and Na+/K+ antiporter (SOS1) at salt-stress responding group play an important role in this unique inverted light-inducible J(Na+) switch, which offers a new paradigm to understand the crosstalk between salt-stress and light signals. |
