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| Effects of nano-selenium synthesized by microorganisms sprayed on leaf surfaces on cadmium selenide absorption in rice |
| Received:May 12, 2023 |
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| KeyWord:microbial synthesis of nano-Se;selenium;cadmium;inorganic selenium;organic selenium;rice |
| Author Name | Affiliation | E-mail | | HE Jianyong | Guangxi Key Laboratory of Agricultural Environment and Agricultural Product Safety, School of Agriculture, Guangxi University, Nanning 530000, China | | | QIN Huisong | Guangxi Key Laboratory of Agricultural Environment and Agricultural Product Safety, School of Agriculture, Guangxi University, Nanning 530000, China | | | JIANG Daihua | Guangxi Key Laboratory of Agricultural Environment and Agricultural Product Safety, School of Agriculture, Guangxi University, Nanning 530000, China | dhjiang2008@gxu.edu.cn | | HUANG Xuejiao | Guangxi Key Laboratory of Agricultural Environment and Agricultural Product Safety, School of Agriculture, Guangxi University, Nanning 530000, China | | | LI Chunxiu | Guangxi Key Laboratory of Agricultural Environment and Agricultural Product Safety, School of Agriculture, Guangxi University, Nanning 530000, China | | | WANG Yizhen | Guangxi Key Laboratory of Agricultural Environment and Agricultural Product Safety, School of Agriculture, Guangxi University, Nanning 530000, China | | | HUANG Zhigang | Guangxi Key Laboratory of Agricultural Environment and Agricultural Product Safety, School of Agriculture, Guangxi University, Nanning 530000, China | | | ZHU Zhengjie | School of Baise, Baise 533000, China | |
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| Abstract: |
| This study aimed to investigate the effects of microbial synthesis of nano-Se(B) on the absorption of cadmium selenide in rice and grain enrichment of Se on Cd reduction. The effects of microbial synthesis SeNPs sprayed with 5(B5), 10(B10), and 20(B20) mg·L-1 on the absorption and transport of cadmium selenide in rice were studied through a pot experiment. Further, the effects of Se enrichment and Cd reduction on rice grains with inorganic Se(S) and organic Se(M) spray were compared. Compared with no Se(CK), S, and M treatments, B5, B10, B20 treatment increased Se content by 227.52%-366.46%, 3.38%-23.31%, and 30.54%-42.57%, and decreased Cd content by 10.14%-55.07%, 4.08%-36.37%, and 9.03%-40.77%, respectively. The effect of Se enrichment on Cd reduction was in the order B>S>M>CK. In B treatment, the best effect of Se enrichment on Cd reduction was observed with a 20 mg·L-1 spray. Further, no significant difference in Se and Cd absorption between high-and low-Se rice varieties was observed. Compared with CK treatment, B treatment promoted the accumulation of Cd in cell wall and vacuole components, reduced the accumulation of chloroplast and mitochondrial components, promoted the accumulation of Se in cell wall and chloroplast components, and reduced the accumulation of mitochondria and vacuole components in rice leaves. The principal component analysis and Pearson correlation matrix showed a negative correlation between Se and Cd content in each part of rice (P ≤ 0.01). Compared with CK, M treatments, the bio-enrichment coefficients of Se in B treatment were increased by 20.63%-264.70%, 20.37%-32.86%, respectively, in the order S>B>M>CK. CK and B5, B10, B20 treatments reduced the Cd enrichment coefficients of rice by 9.10%-25.10%, 5.70%-9.65%, and 10.64%-22.10%, respectively, in the order CK>M>S>B. The Se transfer coefficient of rice was in the order root-stem2O2. The effect of high-Se rice varieties(Tai Fengyou 208) on improving the activity of antioxidant enzymes and the content of antioxidant substances in rice leaves was higher than that of low-Se rice varieties(Gui Yefeng). Therefore, SeNPs synthesized by microorganisms sprayed on the leaf surface have more significant advantages in regulating the absorption and transport of Se and Cd in rice, enriching Se, and reducing Cd in grain. |
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