An Exploration of Growth and Selenium Enrichment of Selenium-enriched Rice

[Objectives]To explore the effects of selenium fertilizer on rice growth and selenium enrichment.[Methods]Using high-quality rice varieties as experimental materials,exogenous selenium fertilizer was sprayed at two critical periods of tillering stage and full heading stage to explore the effects of different selenium treatments on rice agronomic traits,leaf SPAD value and yield.[Results]Spraying selenium fertilizer could promote the growth of rice,and the selenium enrichment effect in the aboveground parts of the plant was obvious.The selenium content of rice(milled rice)was 0.04-0.07 mg/kg.[Conclusions]This study lays a foundation for the promotion of suitable leaf fertilizers in Zhaoqing City,and is expected to promote the cultivation and promotion of selenium-enriched rice.

Research Progress of Selenium-enriched Agricultural Crops and Horticultural Crops in China

Selenium（Se） is one of the essential trace elements required by humans and animals. It will cause diseases for humans and animals when Se is excessive or lack in the environment.The research status of selenium-enriched agricultural crops and selenium-enriched horticultural crops, functional mechanism and application status of selenium, and the latest progress in the study of selenium enrichment were summarized in this paper.

High-quality Development of Selenium-enriched Industry in Guangxi Driven by Scientific and Technological Innovation

As the largest natural selenium-enriched soil area in China,Guangxi has achieved a leapfrog development in its selenium-enriched industry through the implementation of major scientific and technological projects driven by selenium-enriched innovation.The selenium-enriched industry has also become a new force in the poverty alleviation industry in Guangxi,making remarkable achievements.While summarizing and sorting out the effective measures and effects of scientific and technological innovation driving the development of selenium-enriched industry,the present paper analyzed some shortcomings and problems in the high-quality development of the selenium-enriched industry driven by the scientific and technological innovation.Finally,in view of the problems,it came up with pertinent recommendations and countermeasures,to better promote high-quality development of the selenium-enriched industry and boost the rural revitalization.

Standardized Production Technology of Selenium-enriched Hylocereus undatus(pitaya) in Natural Selenium-rich Areas

With the adjustment of the tropical and subtropical fruit industry organizations in southern China, the Hylocereus undatus(pitaya) industry is growing rapidly in subtropical Guangxi and other places. Guangxi is also the largest natural selenium-rich region in the country, and selenium-enriched pitaya is increasingly sought after by the general public. This paper described in detail the selection of selenium-enriched pitaya production fields, key planting techniques and core selenium enrichment techniques, with a view to providing technical guidance for the standardized production of selenium-enriched pitaya and providing technical support for improving the quality and efficiency of pitaya production in natural selenium-rich areas.

Selenium Enriched Trionyx sinensis : A New Choice for the Sustainable Development Model of Modern Agriculture

Based on the analysis of the current situation and existing problems of traditional Chinese soft shelled turtle(Trionyx sinensis)breeding industry,combined with the fact that selenium enriched functional agriculture is the future demand of mankind,this paper put forward the necessity of developing selenium enriched Chinese soft shelled turtles and promoting the sustainable development of modern agriculture:the development of selenium-enriched Chinese soft-shelled turtle is the need of the consumer market for food safety,the need to reduce the production cost of soft-shelled turtles and improve the production efficiency of soft-shelled turtles,the need to enrich the Chinese soft-shelled turtle market,and the need to promote the sustainable development of modern agriculture(fishery).

Nano-selenium controlled cadmium accumulation and improved photosynthesis in indica rice cultivated in lead and cadmium combined paddy soils

Selenium nanoparticles(Se NPs) are less toxic and more biocompatible than selenite or selenate. However, studies involving spraying with Se NPs for reducing accumulation of cadmium(Cd) and lead(Pb) in rice grains have been rarely reported as yet. Herein, indica rice seedlings cultivated in Cd + Pb-spiked paddy soils(denoted as positive control) were sprayed with Se NPs sols for four times from tillering to booting stage. Compared to positive control, 50–100 μmol/L Se NPs downregulated Cd transporters-related genes such as Os LCT 1, OsH MA 2 and Os CCX2 in leaves and OsLCT1, Os PCR1 and Os CCX2 genes in node I at filling stage. Meanwhile, Se-binding protein 1 was distinctly elevated, involving the repression of Cd and Pb transportation to rice grains. Se NPs also differentially improved RuBP carboxylase and chlorophylls especially some key genes and proteins involving photosynthetic system. Besides, 25–50 μmol/L Se NPs diminished reactive oxygen species overproduction from NADPH oxidases whereas boosted glutathione peroxidase, reducing protein carbonylation in rice seedlings. However, the antioxidant isozymes and oxidatively modified proteins were slightly rebounded at 100 μmol/L. Se contents were noticeably elevated and confirmed to exist as selenomethionine in the rice grains following all the treatments by Se NPs. Thus, the optimal dosage of Se NPs for foliar application is 50 μmol/L, which significantly decreased Cd accumulation, improved photosynthesis and Se enrichment whereas caused no distinct reduction of Pb in the grains. Thus, an appropriate dosage of Se NPs can be conducted to decrease Cd accumulation, improve photosynthesis, and organic Se contents in rice grains.