Selected soil water tensions at phenological phases and mineral content of trace elements in rice grains – mitigating arsenic by water management

Silva, Jaqueline Trombetta da; Paniz, Fernanda Pollo; Sanchez, Fabiana e Silva; Pedron, Tatiana; Torres, Daiane Placido; Concenço, Fernanda Izabel Garcia da Rocha; Parfitt, J. M. B.; Batista, Bruno Lemos

doi:10.1016/j.agwat.2019.105884

Cited by 15 publications

(6 citation statements)

References 59 publications

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“…Unlike As, the values of Cd concentration were significant increased under sprinklers in reference to flooding irrigation, however, the limit of 0.2 mg kg −1 did not exceed by any management systems ( Figure 2 B). These results are coherent with several studies that also reported that water-saving irrigation reduces grain arsenic but enhances cadmium [ 24 , 62 ]. However, Spanu et al [ 17 , 28 ] who studied the effect of the irrigation method on the bioaccumulation of toxic elements in rice grain, indicated that sprinkler irrigation could be interesting management in order to reduce the Cd concentration in rice grain, although these authors observed that this result could depend on the crop year.…”

Section: Resultssupporting

confidence: 92%

Medium-Term Effects of Sprinkler Irrigation Combined with a Single Compost Application on Water and Rice Productivity and Food Safety

Peña

Martín-Franco

Fernández-Rodríguez

et al. 2023

Plants

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Traditional rice (Oryza sativa L.) management (tillage and flooding) is unsustainable due to soil degradation and the large amount of irrigation water used, an issue which is exacerbated in the Mediterranean region. Therefore, there is a need to explore rice management strategies in order to improve water-use efficiency and ensure its sustainability. Thus, field experiments were conducted to determine the medium-term effects of different irrigation and tillage methods combined with a single compost application on water and rice productivity, as well as food safety in a semiarid Mediterranean region. The management systems evaluated were: sprinkler irrigation in combination with no-tillage (SNT), sprinkler irrigation in combination with conventional tillage (ST), which were implemented in 2015, and flooding irrigation in combination with conventional tillage (FT), and their homologues (SNT-C, ST-C, and FT-C) with single compost application in 2015. In reference to rice grain yield, the highest values were observed under ST treatment with 10 307 and 11 625 kg ha−1 in 2018 and 2019 respectively; whereas between FT and SNT there were no significant differences, with 8 140 kg ha−1 as mean value through the study. Nevertheless, sprinkler irrigation allowed saving 55% of the total amount of water applied in reference to flooding irrigation. Furthermore, the highest arsenic concentration in grains was found under FT but it decreased with compost application (FT-C) and especially with sprinkler irrigation, regardless of tillage management systems. However, sprinkler irrigation favors the cadmium uptake by plants, although this process was reduced under SNT in reference to ST, and especially under amended compost treatments. Therefore, our results suggested that a combination of sprinkler irrigation and compost application, regardless of the tillage system, could be an excellent strategy for rice management for the Mediterranean environment in terms of water and crop productivity as well as food safety.

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Section: Resultssupporting

confidence: 92%

Medium-Term Effects of Sprinkler Irrigation Combined with a Single Compost Application on Water and Rice Productivity and Food Safety

Peña

Martín-Franco

Fernández-Rodríguez

et al. 2023

Plants

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“…The present study corroborates findings where As concentrations in rice grain did not increase under e[CO2]. Additional research may show that differences in As accumulation exists between rice varieties [62].…”

Section: Resultssupporting

confidence: 92%

“…However, in a monitoring study of total As concentration in rice grains from different Brazilian regions, concentrations ranged between <2.6 µg kg −1 and 630 µg kg −1 , indicating that rice grains were contaminated with values above the limit in the Rio Grande do Sul state [62]. The speciation study in the monitoring mentioned earlier indicated averages between 68 to 174 µg kg −1 of inorganic As in rice from the flooded system.…”

Section: Resultsmentioning

confidence: 90%

“…In a study comparing intermittent and continuous flooding, up to 24% reductions in As concentration were obtained in rice grains using an intermittent flood regime [61]. A study developed with different soil-water content to assess rice grains' toxic elements availability indicated lower concentrations of As in less saturated conditions [62]. An intermittent regime helps decrease As uptake, since oxygen can interfere with the bioavailability of As through the active root-associated microbiota involved in arsenic cycles [63]; this factor may be associated with our results.…”

Section: Resultsmentioning

confidence: 99%

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Effects of Elevated Atmospheric CO2 Concentration and Water Regime on Rice Yield, Water Use Efficiency, and Arsenic and Cadmium Accumulation in Grain

et al. 2021

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(1) Background: Elevated atmospheric CO2 concentration affects the growth and development of the rice crop. In Southern Brazil, rice is traditionally produced with continuous irrigation, implying a significant amount of water used. Besides, continuous flooding favors the uptake of toxic elements such as arsenic (As) and cadmium (Cd). In this work, one Brazilian rice cultivar (IRGA 424) was tested for the effects of elevated CO2 concentration and different water regimes on rice yield, and As and Cd accumulation in grain. (2) Methods: Rice was grown in two CO2 concentrations (400 and 700 µmol mol−1) and two irrigation regimes (continuous and intermittent). It was evaluated the number of tillers, plant height, aboveground dry weight (ADW), water use efficiency (WUE), rice yield components, and As and Cd concentration in rice grain. (3) Results: Rice plants were taller and had a higher WUE when cultivated at e[CO2]. The ADW and the rice yield component were not affected by CO2 levels nor water regimes. Intermittent flood regimes had a lower average As concentration. The Cd concentration in the samples in both growing seasons and all treatments was below the limit of quantitation (8.76 μg kg−1). (4) Conclusions: Enhanced CO2 concentration did not affect rice yield, increased the WUE, and reduced As concentration in grains. Regarding water management, the intermittent regime enhanced WUE and promoted a reduction in As concentration in grains.

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“…Note: The soils used in all treatments were prepared on the same day and under the same conditions. References [64][65][66][67][68][69]…”

Section: Supplementary Materialsmentioning

confidence: 99%

Selenium Biofortification Enhanced Grain Yield and Alleviated the Risk of Arsenic and Cadmium Toxicity in Rice for Human Consumption

Paniz

Pedron

Procópio

et al. 2023

Toxics

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Arsenic (As) and Cadmium (Cd) are toxic to rice plants. However, selenium (Se) has the potential to regulate As and Cd toxicity. The present study aimed to evaluate the co-exposure to As5+ and Se6+ species in two rice cultivars, BRS Pampa and EPAGRI 108. The plants were divided into six groups and cultivated until complete maturation of the grains, under greenhouse conditions. Regarding total As and inorganic As (i-As) accumulation in grains, the highest concentrations were found for BRS Pampa. For Se, EPAGRI 108 presented the highest concentration of inorganic and organic Se (i-Se and o-Se). The exposure assessments showed that Se biofortification can mitigate the As accumulation in rice and, consequently, the risk of As and Cd toxicity in grains for human consumption. The combined effect of As and Se in rice plants could represent an alternative to biofortify this food in a safe way and with a higher percentage of bioavailable Se. Although Se is able to mitigate As toxicity in rice plants, in the present study we showed that co-exposure in different cultivars under the same growing conditions may present different responses to As and Se exposure.

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Selected soil water tensions at phenological phases and mineral content of trace elements in rice grains – mitigating arsenic by water management

Cited by 15 publications

References 59 publications

Medium-Term Effects of Sprinkler Irrigation Combined with a Single Compost Application on Water and Rice Productivity and Food Safety

Medium-Term Effects of Sprinkler Irrigation Combined with a Single Compost Application on Water and Rice Productivity and Food Safety

Effects of Elevated Atmospheric CO2 Concentration and Water Regime on Rice Yield, Water Use Efficiency, and Arsenic and Cadmium Accumulation in Grain

Selenium Biofortification Enhanced Grain Yield and Alleviated the Risk of Arsenic and Cadmium Toxicity in Rice for Human Consumption

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