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Effects of polypropylene microplastics on the growth and ecophysiological characteristics of soybean(Glycine max)and peanut(Arachis hypogaea L.)
Received:October 17, 2022  
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KeyWord:polypropylene microplastic;bearing type;functional trait;biomass accumulation;physiological response;grain quality
Author NameAffiliationE-mail
JIANG Juntao College of Life Science and Bioengineering, Shenyang University, Shenyang 110044, China
CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China 
 
CHEN Hongwei College of Life Science and Bioengineering, Shenyang University, Shenyang 110044, China  
YAN Xinzhu Northeastern University at Qinhuangdao, Qinhuangdao 066001, China  
DENG Jiaojiao CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China  
WEI Zhanbo CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
Engineering Laboratory for Green Fertilizer, Chinese Academy of Sciences, Shenyang 110016, China 
 
ZHOU Wangming CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China  
ZHOU Li CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China  
YU Dapao CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China  
WANG Qingwei CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China wangqingwei@iae.ac.cn 
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Abstract:
      Although microplastic pollution of farmland has significant effects on crop growth, data regarding the responses of the physiological and ecological characteristics, yield, and quality of different functional types of crops to soil microplastics are limited. Therefore, we selected two major crop species, Glycine max(aboveground-bearing)and Arachis hypogaea L.(belowground-bearing), as the plant materials and carried out an in situ addition experiment of polypropylene microplastics(0%, 0.4% addition). Our results demonstrated that the interaction between microplastics and crop type had a significant impact on the growth and physiological and ecological characteristics of the crops, especially on the morphological structure of the whole plant, biomass accumulation and distribution, and grain quality. The addition of polypropylene microplastics significantly reduced the total biomass, aboveground biomass, relative growth rate, and 100-grain weight of both crops, with soybean decreasing by 13.61%, 14.07%, 13.23%, and 7.84% respectively, and peanut decreasing by 17.10%, 18.64%, 16.12%, and 11.98%, respectively. Moreover, the addition of polypropylene microplastics clearly reduced the belowground biomass and the soluble sugar content of peanut, and the chlorophyll content of soybean by 15.77%, 25.51%, and 5.74%, respectively. On the contrary, the addition of polypropylene microplastics increased the leaf area ratio and soluble sugar content of soybean by 28.07% and 25.82%, respectively. It can be seen that the addition of polypropylene microplastics had major adverse effects on the growth and yield of both crops, but especially on peanut. This study provides key data supporting the impact of soil microplastic pollution on crop yield and quality, and also provides a theoretical basis for future breeding of superior varieties.