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"Selenium in agriculture"
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Selenium-Containing Nanoformulations Capable of Alleviating Abiotic Stress in Plants
Climate changes cause various types of abiotic stress in plants, thus affecting plant growth and causing decline in yield. An urgent need exists to develop an environmentally friendly attitude based on principles of sustainable agriculture. Nanomaterials may improve plant growth and enhance crop productivity by handling the conditions considered stressful for plants in a sustainable and ecofriendly manner. Selenium (Se) has been put into the category of beneficial elements in plants. Se-enriched crops present a successful choice of dietary resource for Se-supplemented food and feed owing to their high bioavailability and accessibility. Researchers from distinct areas, including both nanoscience and plant science, should encourage emerging innovations that are linked with abiotic stress in crop production. The implementation of Se nanoparticles (SeNPs) is considered one of the predominating mechanisms by plants to ameliorate stressful conditions. Increasing evidence of earlier research revealed that SeNPs could enhance plant growth and development, nutrient bioavailability, soil fertility, and stress response while maintaining environmental safety. Meanwhile, some earlier studies reported that SeNPs might have a multilateral influence on plants dependent on diverse Se nanomaterial traits, doses, and plant species. More efforts are required to enhance the knowledge of how SeNPs impact crops exposed to different abiotic detrimental factors. In light of contemporary research challenges linked to SeNPs and the prolonged application of Se nanomaterials to plants, the aim of this review is elucidating the principal fruitful areas of SeNP exploration, comparisons with bulk Se, insights into mechanisms of abiotic stress alleviation in plants, existing research uncertainties, and practical challenges for SeNP applications under varying environments.
Journal Article
Synergistic Effects of Dysmorphococcus globosus on Selenium Enrichment and Astaxanthin Accumulation
Hidden starvation poses a critical threat to people’s nutritional status and overall health. Developing functional agriculture can alleviate hidden starvation. This study investigates organic selenium supplementation challenges and the antioxidant potential of high-value astaxanthin. The microalgal strain Dysmorphococcus globosus HY13 was cultured in medium containing sodium selenite, and the effects of different sodium selenite concentrations on the growth of HY13 were analyzed. Color change was the most obvious when the medium was supplemented with 1500 mg L−1 selenite, with samples showing an orange-red color. The conversion efficiency of inorganic selenium to organic selenium reached 99.23%. Similarly, under selenium stress conditions, the HY13 strain accumulated high levels of astaxanthin (up to 0.86 mg g−1 dry weight). Thus, D. globosus appears to efficiently convert inorganic selenium into organic selenium and synergistically accumulate high-value astaxanthin under selenium stress, emphasizing its potential applications in functional agriculture and nutritionally fortified product development.
Journal Article
Investigation into the Geological Origin and Influencing Factors of Selenium-Enriched Soil in Licheng, Jinan, Shandong Province
The geochemical classification of soils is crucial for the scientific development and utilization of land, particularly in the investigation of selenium-rich soils, which plays a guiding role in the cultivation layout of local selenium-rich agricultural products. This study involves the collection and analysis of over 6000 samples of soil, water quality, and crops from the entire area of Licheng District in Jinan City, Shandong Province. By analyzing the data in conjunction with the geochemical classification standards for soil nutrient levels, soil environmental geochemical levels, and comprehensive soil quality geochemical levels, we delineated a distribution area of selenium-rich soils covering 192.26 km2 in Licheng District, providing a bibliographic basis for the scientific planning of agriculture and forestry in the region.
Journal Article
Research on Topic Mining and Evolution Trends of Functional Agriculture Based on the BERTopic Model
Based on the BERTopic model, this study analyzes 15,744 scientific papers in the field of functional agriculture from 1995 to 2024 to uncover core themes and evolutionary trends in global functional agriculture, and particularly focuses on revealing the developmental trajectory in China. The results indicate that global functional agriculture research is characterized by diverse themes and intensive study, forming a multi-topic cross-network centered on plant chemical extraction and agricultural soil research, with a focus on food nutrition, human health, and environmental protection. By contrast, China’s functional agriculture research demonstrates a more focused and in-depth approach, concentrating on functional food development and agricultural environmental protection themes, with notable growth trends in areas such as selenium-enriched products and resistant starch. Combined with China’s agricultural development environment, this study makes the following suggestions for the development of functional agriculture in China: (1) Promoting interdisciplinary cooperation between functional agriculture and other technologies. (2) Developing agricultural products with Chinese characteristics and forming Chinese functional agricultural product brands. (3) Utilizing smart farming technology to boost functional agriculture.
Journal Article
Phytoremediation of selenium contaminated soil at Smith Ranch-Highland In-Situ Uranium mine
Selenium is an essential trace element for humans and animals but toxic at higher levels. Phytoremediation can be a cost effective, environmentally friendly, and sustainable method for removal of Se contaminants from soil. Field and greenhouse studies were conducted to develop a strategy to use phytoremediation to mitigate high selenium levels in a soil to which high selenium process water was added. Plant species evaluated were: Brassica napus (canola), Brassica juncea (Indian mustard), Stanleya pinnata (Prince’s plume), Kochia scoporia (Kochia). In a greenhouse study, we found incorporation of organic matter into soil with Se hyperaccumulator plant Stanleya pinnata removed significant amount (29%) of Se from the soil in a four-month period. Selenium concentration in tested plant tissue ranged between 5.5 to 79.6 mg kg-1. A two year field study was conducted at Smith Ranch In-Situ Uranium Mine with six treatments and six replications arranged in randomized complete block design. Treatments comprised of Brassica napus (Canola), Brassica napus with Astragalus cicer (Milk vetch), Astragalus cicer, Astragalus cicer with organic matter, Brassica juncea (Indian mustard) and control with no plants. In the field, Se content in the soil prior to planting ranged from 2.58 mg kg-1 to 3.96 mg kg-1 and two years after initiation of the study, ranged from 0.002 to 0.003 mg kg-1. No significant difference was observed among the tested plants in Se accumulation capacity and in biomass production. Plant biomass production and Se accumulation into plant biomass was not high to account for soil Se removal. Two alternative hypotheses were developed to explain the loss of Se, 1) Se leaching in to deeper horizon, 2) Se volatilization due to methylation. Data collected support the second hypothesis.
Dissertation
Assessment on the Coupling Effects of Drip Irrigation and Se-Enriched Organic Fertilization in Tomato Based on Improved Entropy Weight Coefficient Model
Selenium (Se) is an essential micronutrient for human beings and plants are the current main sources of Se element in Asian diet. Therefore a feasible way to increase people’s Se intake is to increase Se content in plants. In this paper, we focus on how the tomato (Solanum Lycopersicum) yield and quality are influenced by the effect of irrigation amount, Se-enriched and high-calcium organic fertilizer and compound fertilizer amount respectively. The results from a two-year experiment show that the combination of Se-enriched organic fertilizer and compound fertilizer can significantly increase the tomato yield comparing with the use of NPK organic or compound fertilizer. It is also shown that by applying more Se-enriched and high-calcium organic fertilizer the contents of Se, Lycopene, Vitamin C (Vc) and soluble sugar in tomato fruit can be increased considerably. It was found that the highest Se content was achieved using 100% Se-enriched organic fertilizer combined with irrigation at 100% in 2016 and 100% Se-enriched organic fertilizer with irrigation at 80% in 2017. Deficit irrigation (80%) can help to increase Water Use Efficiency (WUE) and the Se and VC contents in tomato yield. Therefore in order to improve the Se-enriched tomato yield and quality, it is suggested to apply 100% Se-enriched organic fertilizer and adopt the deficit irrigation at 80%.
Journal Article
Diet deficient wheat
Reduced pollution may be partly to blame. \"A general deficiency of selenium in UK soils, and reduced atmospheric deposition from fossil fuel burning are probably the most important contributory factors,\" says Professor Steve McGrath of Harpenden-based Rothamsted Research.
Magazine Article
Recommendations for Sustainable Development of Selenium-enriched Functional Agriculture in Guangxi under the New Normal
Taking Scientific Outlook on Development as the guiding principle, this paper introduced the principles of innovation, coordination, green, openness and sharing. Based on gifted advantages of selenium-enriched soil and selenium-enriched industry development in Guangxi, it discussed current practice, stressed green, ecological, characteristic demonstration, transformation and upgrading, and targeted poverty alleviation. Finally, it came up with perspective, practical, and operational strategies and recommendations for development of selenium-enriched industry, to provide reference for sustainable development of selenium-enriched functional industry in Guangxi.
Journal Article
Effect of foliar spraying of organic and inorganic selenium fertilizers during different growth stages on selenium accumulation and speciation in rice
AimsMost crops are supplemented with selenium (Se) through the exogenous addition of inorganic Se fertilizer. There is a lack of in-depth research on organic Se fertilizers. Meanwhile, the dosage range between human Se deficiency and Se toxicity is narrow, so the Se content of agricultural products needs to be controlled within a reasonable interval.MethodsSe accumulation and speciation in rice were analyzed and compared during three different growth stages (late tillering stage, initiate heading stage, and full heading stage) using three Se fertilizers: selenite, fermented Se, and potassium selenocyanoacetate (Se-AAF) via the foliar application.ResultsThe Se content in rice sprayed with organic Se fertilizer was controlled in the relatively safe range and met the human Se supplement requirement compared to the sprayed sodium selenite, which was too high of a dose. The percentage of organic Se and protein Se in brown rice was found to be similar in all three Se fertilizers. The highest organic Se content of 91.57% was found in the grain of rice at the full heading stage by spraying Se-AAF. The main Se species in the grain was selenomethionine (SeMet), which reached 80% of the total Se. Se-methyl selenocysteine(SeMeCys) was found only in Se-AAF. The grain quality showed that all three Se fertilizers increased the consistency of gelatinization.ConclusionsAppropriately delaying the spraying time and selecting organic Se fertilizer as the Se source can help to produce green and safe selenium-rich rice.
Journal Article