Accumulation, mobilization, and transformation of selenium in rice grain provided with foliar sodium selenite

Farooq, Muhammad Umer; Tang, Zhichen; Zhao, Rui; Liang, Yuanke; Zhang, Yujie; Zheng, Ting; H, Hla; Ye, Xiaoying; Jia, Xiaomei; Zhu, Jianqing

doi:10.1002/jsfa.9502

Cited by 37 publications

(25 citation statements)

References 41 publications

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“…However, the selenium content of selenium-free rice could increase significantly by increasing selenate concentration, which was consistent with the previous results [10,27]. selenium-rich hybrid rice was more sensitive to changes in selenate concentration treatment.…”

Section: Discussionsupporting

confidence: 92%

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Quick selenium accumulation in selenium-rich rice and its physiological changes in selenium environment

Liang¹,

Mu²,

Su³

et al. 2019

Preprint

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Background: The element selenium (Se) deficiency is recognized as a global health problem. Improving Se accumulation in rice grain is an important issue for human health. But Se is both essential and toxic for plants, with a narrow margin between deficiency and toxicity and the mechanism for Se accumulation and tolerance in selenium-rich rice plants remains unknown. Results: In this study, we investigated the phenotypical, physiological and biochemical changes of selenium-rich rice exposed to different stages of Se concentrations. Results showed that selenium-rich rice can accumulate more Se from the root in low selenate environment comparing with selenium-free normal rice. Besides, excessive selenate caused phytotoxic effects on selenium-rich rice plants by inducing chlorosis, dwarfness, reduced antioxidant contents, and exacerbating oxidative stress. Furthermore, both phosphate transporter OsPT2 and sulfate transporters OsSultr1;2 can contribute to selenite uptake in rice. Conclusions: Based on the results, selenium-rich red rice is more sensitive to Se and the best Se concentration for selenium-rich rice is 20μM in the root environment. Such findings can be used to direct and evaluate the toxic effects of Se contamination on selenium-rich rice in the field. To draw a sound conclusion, long-term field trials are still required, including risks and benefits analysis for various management strategies.

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Section: Discussionsupporting

confidence: 92%

“…To determine the Se content, we used the atomic fluorescence spectrophotometer (RGF-6800, Bo Hui Co., Ltd, Beijing, P. R. China) as previously described [26,27]. To determine the anthocyanins content, we used the Shimadzu UV-visible spectrophotometer according to the previously described [11].…”

Section: Measurements Of Selenium and Anthocyanins Contentmentioning

confidence: 99%

Quick selenium accumulation in selenium-rich rice and its physiological changes in selenium environment

Liang¹,

Mu²,

Su³

et al. 2019

Preprint

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“…Using heterosis [23], the material was cross-bred over years of generations in order to have a bioaccumulation effect on Se. The breeding process of these lines can be seen in our published reports [24,25]. The Se-rich rice groups 2057A/R881 and 5097A were tested by the Rice Testing Centre of the Ministry of Agriculture, and the Se content in polished rice was found to have accumulated 0.069 mg kg −1 and 0.14 mg kg −1 (GB/T 5009.93-2010), respectively, which meets the national standard for a Se-rich paddy: that is, 0.04–0.30 mg kg −1 (GB/T 22499-2008).…”

Section: Methodsmentioning

confidence: 99%

Cross-Talk between Cadmium and Selenium at Elevated Cadmium Stress Determines the Fate of Selenium Uptake in Rice

et al. 2019

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Cadmium (Cd) is a well-known metal imposing threats to human health, and it can be accumulated in polished rice over the permitted range of 0.2 mg kg−1 (GB 2762-2017). It has been reported that selenium (Se) application decreases Cd uptake. Se-rich diets have gained attention recently, but the potential of Se-rich rice in mitigating Cd stress needs further investigation. In this study, a pot experiment in the field was conducted to assess the influence of environmental factors and exogenous split application of Se on the nutritional status of rice under Cd stress. The results indicated that the increased fertilizer treatment in soil bulk linearly increased the metal content in rice grains. Approximately 50–70% of metal was recovered in rice tissues, while 5–20% of the metal that was applied leached down into the soil. A Se concentration of 0.4 mg kg−1 could significantly improve the total Se content in grain and mitigate Cd toxicity (1 mg kg−1) below the permitted range. Panicles and roots were more active for total Se accumulation in Se-rich and non-Se-rich rice, respectively. Polishing and milling operations can significantly reduce the Cd content, as rice bran in rice tissues accumulated most of the metal’s residues. The late matured rice cultivars consumed more heat units, and more metal contents were found in them. Collectively, it was found that Se can mitigate Cd toxicity, but the rice cultivation at T2 (high Cd; 2 mg kg−1 and Se; 1 mg kg−1) increased the metal uptake capability and health-risk index in polished rice, with its Se content heightened over permitted range of 0.04 to 0.30 mg kg−1 (GB/T 22499-2008). However, further molecular studies are required, in order to completely access the inverted Se accumulation behavior in rice tissues at high Cd soil stress.

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“…An atomic fluorescence spectrophotometer was applied to determine the Se content as described previously [47, 48]. Briefly, after grinding into fine powder, 0.5 g samples were weighted and filled into a glass vial containing a pre-prepared solution of 9 ml HNO 3 and 1 mL HClO 4 .…”

Section: Methodsmentioning

confidence: 99%

Quick selenium accumulation in the selenium-rich rice and its physiological responses in changing selenium environments

Liang

Yang

et al. 2019

BMC Plant Biol

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BackgroundThe element selenium (Se) deficiency is thought to be a global human health problem, which could disperse by daily-supplement from Se-rich food. Increasing the accumulation of Se in rice grain is an approach matched to these nutrient demands. Nonetheless, Se is shown to be essential but also toxic to plants, with a narrow margin between deficiency and toxicity. Notably, the regulatory mechanism balancing the accumulation and tolerance of Se in Se-rich rice plants remains unknown.ResultsIn this study, we investigated the phenotypical, physiological, and biochemical alterations of Se-rich rice in the exposure to a variety of Se applications. Results showed that the Se-rich rice was able to accumulate more abundance of Se from the root under a low Se environment comparing to the Se-free rice. Besides, excessive Se led to phytotoxic effects on Se-rich rice plants by inducing chlorosis and dwarfness, decreasing the contents of antioxidant, and exacerbating oxidative stresses. Furthermore, both phosphate transporter OsPT2 and sulfate transporters OsSultr1;2 may contribute to the uptake of selenate in rice.ConclusionsSe-rich red rice is more sensitive to exogenous application of Se, while and the most effective application of Se in roots of Se-rich rice was reached in 20 μM. Our findings present a direct way to evaluate the toxic effects of Se-rich rice in the Se contaminated field. Conclusively, some long-term field trial strategies are suggested to be included in the evaluation of risks and benefits within various field managements.

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Accumulation, mobilization, and transformation of selenium in rice grain provided with foliar sodium selenite

Cited by 37 publications

References 41 publications

Quick selenium accumulation in selenium-rich rice and its physiological changes in selenium environment

Quick selenium accumulation in selenium-rich rice and its physiological changes in selenium environment

Cross-Talk between Cadmium and Selenium at Elevated Cadmium Stress Determines the Fate of Selenium Uptake in Rice

Quick selenium accumulation in the selenium-rich rice and its physiological responses in changing selenium environments

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