highly significantP < 0.01
Correlation analyses Both the root biomass and shoot biomass showed a highly significant ( P < 0.01) positive correlation with the chlorophyll a content, chlorophyll b content, total chlorophyll content, carotenoid content, POD activity, SOD activity, CAT activity, and soluble protein content, while showed a highly significant ( P < 0.01) negative correlation with the MDA content ( Table 7 ).