Effect of salinity and its composition on the accumulation of selenium by alfalfa

Mikkelsen, Robert L.; Page, A. L.; Haghnia, G H

doi:10.1007/bf02371545

Cited by 54 publications

(24 citation statements)

References 11 publications

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“…presence of sulfur. This result is consistent with findings on Se uptake by other plant species such as alfalfa (Mikkelsen et al, 1988), saltgrasses (Enberg and Wu, 1995), and wheat (Grieve et al, 1999). Low EC levels in the sulfate salinity treatment (2.2 or 5.0 dS m −1 ) resulted in higher Se uptake in the leaves and seeds than did higher EC treatments.…”

Section: Resultssupporting

confidence: 91%

“…Selenium uptake by plants depends on many factors including substrate characteristics such as total salinity and the speciation of salt ions (Brown and Shrift, 1982;Läuchli, 1993;Wu, 1998). Because of similarities in chemical properties, significant reductions in Se uptake were found under sulfate-dominated salinity as compared with chloride salinity by many plant species including alfalfa (Mikkelsen et al, 1988), two saltgrass ecotypes (Enberg and Wu, 1995), and wheat (Grieve et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Composition of Irrigation Water Salinity Affects Growth Characteristics and Uptake of Selenium and Salt Ions by Soybean

Wang

Grieve

Suarez

2005

Journal of Plant Nutrition

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A greenhouse study was conducted to determine the effects of irrigation waters differing in salt composition on growth characteristics, salt ion and selenium (Se) accumulation, and distribution in plant components of the soybean (Glycine max L. Merr.) cultivar "Manokin." Plants were grown in sand cultures and irrigated with isoosmotic solutions containing (1) Cl − as the dominant anion, or (2) a mixture of salts containing equal molar amounts of SO 2− 4 and Cl − . Six treatments of each salinity type were imposed. Electrical conductivities of the irrigation waters ranged from 2.1 to 13.0 dSm −1 . Selenium (1 mg · L −1 , 12.7 µM) was added to all irrigation waters as Na 2 SeO 4 . Regardless of salinity type, soybean plants were generally taller under the low-salinity treatments in early vegetative stages of growth. Towards the end of vegetative stages and until final harvest, higher values of plant height, leaf area, and shoot dry weight were found at the intermediate salinity levels (5.0 and 9.2 dS m −1 ), and higher salinity in general led to increased soybean leaf chlorophyll on a unit-area basis. Shoot-to-root ratios decreased with increasing chloride salinity, while the ratios remained nearly constant under the sulfate salinity treatment. Plant uptake and accumulation of salt ions (Ca 2+ , Mg 2+ , Na + , Cl − ), K + , total phosphorus (p), and total sulfur (s) were generally not related to the type of salinity, except total S, where higher concentrations were found in leaves, stems, and roots in the sulfate than under the chloride salinity treatment. Selenium concentration in leaves and seeds was about 4 mg kg −1 at final harvest when irrigated with the sulfate-based saline waters. Under the chloride salinity treatment, Se level was found to be about three times higher in leaves and five times higher in seeds. In conclusion, different solution concentrations of SO 1073This article is a U.S. government work, and is not subject to copyright in the United States. D. Wang et al.decreased with increasing chloride salinity, high-sulfate salinity reduced Se uptake by "Manokin" soybean.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Composition of Irrigation Water Salinity Affects Growth Characteristics and Uptake of Selenium and Salt Ions by Soybean

Wang

Grieve

Suarez

2005

Journal of Plant Nutrition

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“…It has been shown that sulphate salinity drastically inhibits plant uptake of selenate (Bell, et al, 1992;Mikkelen et al, 1988;Wu and Huang, 1991). Chloride salinity has been observed to have much less effect on selenate uptake than sulphate salinity (Mikkelen et al, 1988;Shennan et al, 1990;Wu and Huang, 1991). Results from this study indicate that there is no inhibitory effect of I (as iodate) on plant uptake of selenate, suggesting that plant uptake of iodate is unlikely to be mediated by the selenate uptake system on the plant root plasma membrane.…”

Section: Discussionmentioning

confidence: 55%

“…Selenate is believed to be taken up by plant roots through a sulphate transport in the root plasma membrane (Abrams et al, 1990;Arvy, 1993), and therefore SeO 4 2− can compete with SO 4 2− . It has been shown that sulphate salinity drastically inhibits plant uptake of selenate (Bell, et al, 1992;Mikkelen et al, 1988;Wu and Huang, 1991). Chloride salinity has been observed to have much less effect on selenate uptake than sulphate salinity (Mikkelen et al, 1988;Shennan et al, 1990;Wu and Huang, 1991).…”

Section: Discussionmentioning

confidence: 99%

Interactions between selenium and iodine uptake by spinach (Spinacia oleracea L.) in solution culture

Zhu¹,

Huang²,

Hu³

et al. 2004

Plant and Soil

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Interactions between Se (as selenate) and I (as iodate) uptake by spinach plants (Spinacia oleracea L.) were studied under controlled conditions using solution culture. Spinach readily accumulated both Se and I in the edible parts, the leaves, with solution-to-leaf transfer factors ranging from 3.5 to 13.4. The distribution coefficients between leaves and roots ranged from 4.07 to 5.66 for I and 4.51 to 8.59 for Se. Selenium concentrations in plant tissues were unaffected by addition of I to the nutrient solution. Similarly, plant I concentrations were unaffected by addition of Se to the nutrient solution, except in nutrient solution with I at a concentration of 50 µM, in which addition of Se lowered shoot I concentrations significantly, but the effect was of low magnitude. These results indicate the possible feasibility of dual supplementation of plant growth substrates with Se and I to improve human nutrition where these two elements are deficient in the diet. The data also indicate the involvement of a positive feedback mechanism in the uptake of Se by spinach plants, since Se concentrations in leaves increased disproportionately with increasing Se concentration in the nutrient solution.

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“…Se uptake and its effect on growth of alfalfa as an important feed crop have been studied by many authors (Soltanpour and Workman 1980, Mikkelsen et al 1987, 1988. It was shown that alfalfa is highly susceptible to Se and toxicity can occur at contents below 100 µg Se g -1 (Shrift 1969).…”

Section: Introductionmentioning

confidence: 99%

The effects of selenate and sulphate supply on the accumulation and volatilization of Se by cabbage, kohlrabi and alfalfa plants grown hydroponically

Hajiboland¹,

Amjad²

2008

AFSci

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The effect of Selenium (Se) supplementation at five levels of 0 (control), 5, 10, 15, 20 µM in plants supplied with one of four concentrations of sulphur (S) including 0.05, 0.25, 0.5 and 1.0 mM was investigated in two varieties of Brassica oleracea (cabbage and kohlrabi) and alfalfa (Medicago sativa L.) in a hydroponic experiment. In severely S deficient plants (0.05 mM), Se acted as a toxic element, alfalfa was the most susceptible plant that died at this treatment. However, in plants supplied with near adequate (0.5 mM) or adequate (1.0 mM) S, Se acted as a growth promoting element. The most pronounced stimulation of growth was observed in cabbage and the lowest in alfalfa. Increasing S concentration in the medium, reduced Se uptake and transport. In contrast, S uptake and transport increased in response to Se addition. Se volatilization was higher in alfalfa than cabbage and kohlrabi when expressed on unit shoot dry weight or leaf area basis, but not when expressed per plant. Results suggested that Se supplementation of plants supplied with adequate S, not only had beneficial effects on plants growth but also can have application in enrichment of livestock fodder and human food.

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Effect of salinity and its composition on the accumulation of selenium by alfalfa

Cited by 54 publications

References 11 publications

Composition of Irrigation Water Salinity Affects Growth Characteristics and Uptake of Selenium and Salt Ions by Soybean

Composition of Irrigation Water Salinity Affects Growth Characteristics and Uptake of Selenium and Salt Ions by Soybean

Interactions between selenium and iodine uptake by spinach (Spinacia oleracea L.) in solution culture

The effects of selenate and sulphate supply on the accumulation and volatilization of Se by cabbage, kohlrabi and alfalfa plants grown hydroponically

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