Moreover, a decreasing trend with the increment of PS-MP concentration was observed, suggesting that low levels of PS-MPs had a minimal impact on plant root exudation.
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The Combined Toxic Effects of Polystyrene Microplastics and Arsenate on Lettuce Under Hydroponic Conditions.
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The sentences
On Day 10, the overall chlorophyll of lettuce in the group with PS-MP addition alone showed an increasing trend, and the chlorophyll concentration of P20 was lower than that of P5, which increased by 13.34% (1.3 SPAD units, P20) and 27.08% (3.37 SPAD units, P5), respectively, compared with CK, indicating that PS-MPs had a certain positive effect.