Intercropping of Gramineous Pasture Ryegrass (Lolium perenne L.) and Leguminous Forage Alfalfa (Medicago sativa L.) Increases the Resistance of Plants to Heavy Metals

Figure 5

The antioxidant enzyme system contents in shoots and roots of ryegrass and alfalfa under the monoculture and intercropping treatments. POD activity in shoots (a), POD activity in roots (b), CAT activity in shoots (c), CAT activity in roots (d), APX activity in shoots (e), and APX activity in roots (f). Bars are standard error (). Means followed by the same letter are not significantly different at of ryegrass and alfalfa with different treatments.

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