Low pH Stress Induces the Accumulation of ROS By Increasing Production of Nitrate Reductase-Dependent NO in Rice Root Tips

Low pH stress is one of the major factors limiting crop production on acidic soils. It often coexists with metal ion toxicity and this makes it difficult to explore directly the effect of pH in acidic soils. So far, the mechanisms of low pH stress in rice is poorly understood. Two rice varieties with different low pH tolerance, Kasalath (low pH-tolerant) and Jinguoyin (low pH-sensitive), were selected to (i) study the relationship between low pH stress and the accumulation of nitric oxide (NO) and reactive oxygen species (ROS), and (ii) explore the regulatory relationship between NO and ROS under low pH stress.