Effects of Microplastic Pollution from Tire Wear on Growth of Rice at Tillering Stage
With the proliferation of automobile use,the environmental pollution problem caused by the large a-mount of tire wear particles(TWP)generated by the wear of automobile tires has received increasing attention.However,there are relatively few studies on the effects of tire wear particles on plant growth,and the mechanism of their effects is still unclear.In this paper,we used rice at the tillering stage as the test plant,and investigated the effects of TWP pollution on plant growth with different particle sizes(90,100,125,150 and 180 μm)and concen-trations(100,500,and 1 000 mg·L-1)through hydroponics experiments.The results showed that there was a sig-nificant concentration effect and no significant particle size effect of TWP on the growth of rice.TWP pollution had a significant inhibitory effect on aboveground indexes(root length,plant height,root weight,leaf weight,etc.)and root morphology(root length,root surface area,average diameter,root volume,number of apices,etc.)of rice.With the increase of TWP concentration,chlorophyll content was promoted and then inhibited,and CAT activity was promoted and then inhibited;TWP pollution promoted rice root and leaf SOD activity,but inhibited root vigor and root POD activity,and the higher the concentration,the more significant inhibition effect was;when the con-centration of TWP was 100 mg·L-1,the leaf POD activity of rice in all the treatment groups was inhibited,and when the concentration of TWP was 100 mg·L-1,all the rice leaf POD activities were inhibited,while at a TWP concentration of 500 mg·L-1,all the rice leaf POD activities in all the treatment groups were promoted,and when the concentration of TWP was 1 000 mg·L-1,the promotion effect was weakened.It can be seen that tire wear par-ticles significantly altered the antioxidant enzyme activities of rice,and at the same time induced the rice root stress response,which induced the stress response through the oxidative-antioxidant system of the plant root system and leaves.
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