Plants growing under high levels of heavy metal tend to develop biochemical and molecular mechanisms to tolerate the effect of heavy metal stress, but apparently differences of adaptability and resistance were found among different species and different varieties of plant. The solution cultivation experiment and the pot experiment (root bag method) were carried out to investigate the influence of Zn stress on plant growth, biomarkers, Zn uptake and accumulation, root exudates among four varieties of ryegras...