Abstract: Taking the cutting seedlings of grape variety ‘Ze-xiang’ as test materials, a hydroponic experiment was conducted to study the generation patterns of
endogenous nitric oxide (NO) and reactive oxygen species (ROS) in their roots and leaves, and the changes of root MDA content and root activity under the stress of cadmium chloride (CdCl₂). In the treatments 0-1 mmol·L^-1 of CdCl₂, the NO content and NOS activity in roots and leaves and the root activity all presented a tendency of increasing first and decreasing afterwards with increasing CdCl₂. At 0.01 mmol·L^-1 of CdCl₂, the NO content and NOS activity in roots increased by 51% and 63%, respectively; but at >0.1 mmol·L^-1 of CdCl₂, they decreased significantly. At 0.01 and 0.05 mmol·L^-1 of CdCl₂, the leaf NO content and NOS activity had the greatest increase; at 0.5 and 1.0 mmol·L^-1 of CdCl₂, the root O₂^-· generation rate and H₂O₂ and MDA contents increased significantly. At the same concentrations of CdCl₂, the O₂^-·  generation rate in leaves was much lower while the H₂O₂ content was much higher, compared with those in roots.

Key words: grape, CdCl₂, NO, ROS metabolize, BeijingTianjinHebei, resource environmental bearing capacity, driving factors, state space model, Tobit model.