ORIGINAL RESEARCH
Influence of Br24 and Gr24 on the Accumulation and Uptake of Cd and As by Rice Seedlings Grown in Nutrient Solution
Bo Xu 1  
,  
Jinyong Yu 1
,  
Yangyang Guo 1
,  
Jing Ding 2  
,  
Yanhui Chen 1  
,  
 
 
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1
Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environmental Sciences, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
2
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
CORRESPONDING AUTHOR
Jing Ding   

State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing,, 100085 Beijing, China
Online publish date: 2019-05-03
Publish date: 2019-07-08
Submission date: 2018-07-13
Final revision date: 2018-09-09
Acceptance date: 2018-09-10
 
Pol. J. Environ. Stud. 2019;28(5):3951–3958
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ABSTRACT
Plant hormones are trace organic molecules that play important roles in plant growth, development and stress resistance. 24-epibrassinolide (Br24) and strigolactones (Gr24) were reported to alleviate the toxicity of heavy metals and restrict their translocation into plants. In this study, the effects of Br24 and Gr24 with or without iron plaque (IP) induction on the uptake and accumulation of cadmium (Cd) and arsenic (As) were examined in rice seedlings exposed to 6-day treatments of 2 mg L-1 Cd or 5 mg L-1 As in nutrient solution. The results showed that the growth of rice seedlings was decreased by Cd or As treatment, but Br24 or Gr24 with or without IP alleviated this adverse effect. Br24 or Gr24 can improve root length, average diameter, surface area, and volume, and tip the number of roots of rice plants with or without IP. Cadmium contents in rice shoots were significantly reduced by Br24 with IP or Gr24, but Cd accumulation and translocation from root to shoot were not decreased. The interaction of Br24 or Gr24 and IP dramatically increased As contents in rice root, and reduced As translocation from root to shoot. Br24 or Gr24 with IP induction significantly increased Fe content, but decreased the contents of mineral elements (Mn, Cu and Zn) in rice plants. Our results suggested that the exogenous application of Br24 or Gr24 could be advantageous against the toxicity of Cd or As, and a potential way to effectively inhibit Cd or As uptake by rice plants.
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ISSN:1230-1485