Effects of lanthanum(III) on nitrogen metabolism of soybean seedlings under elevated UV-B radiation

Cao, Rui; Huang, Xiaohua; Zhou, Qing; Cheng, Xiao-ying

doi:10.1016/s1001-0742(07)60222-8

Cited by 21 publications

(8 citation statements)

References 17 publications

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“…GDH releases NH 3 by catalyzing the reversible conversion of 2-oxoglutarate and L-glutamate for the entry of ammonium into the organic cycle, and it is one of the few enzymes capable of that can be separately recycled to be used in respiration and amide formation, and carbon from amino compounds in the form of ketoacids and to enable the synthesis of compounds with low C/N ratios, respectively. The content and activity of GDH also increased under various stress conditions [18,39,40].…”

Section: Discussionmentioning

confidence: 87%

“…Photosynthesis was inhibited by Mn deficiency [13,[30][31][32], thus leading to the reduction of NR activity in Mn-deficient maize seedlings. Moreover, the previous studies demonstrated that added Ce was favorable to relieve the inhibition of N metabolism and photosynthesis under such stresses as Mg or Ca or Mn deficiency [17,18,33,34], which could partly explain the increase of NR activity by added Ce to maize seedlings under Mn deficiency.…”

Section: Discussionmentioning

confidence: 99%

“…Rare earths were demonstrated to improve the N metabolism of the peach plantlet, magnesium (Mg)-or calcium (Ca)-deficient spinach, and soybean seedlings under elevated UV-B radiation [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Manganese Deficiency and Added Cerium on Nitrogen Metabolism of Maize

Gong

Liu

et al. 2011

Biol Trace Elem Res

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Manganese is one of the essential microelements for plant growth, and cerium is a beneficial element for plant growth. However, whether manganese deficiency affects nitrogen metabolism of plants and cerium improves the nitrogen metabolism of plants by exposure to manganese-deficient media are still unclear. The main aim of the study was to determine the effects of manganese deficiency in nitrogen metabolism and the roles of cerium in the improvement of manganese-deficient effects in maize seedlings. Maize seedlings were cultivated in manganese present Meider's nutrient solution. They were subjected to manganese deficiency and to cerium chloride administered in the manganese-present and manganese-deficient media. Maize seedlings grown in the various media were measured for key enzyme activities involved in nitrogen metabolism, such as nitrate reductase, glutamate dehydrogenase, glutamine synthetase, and glutamic-oxaloace transaminase. We found that manganese deficiency restricted uptake and transport of NO(3)(-), inhibited activities of nitrogen-metabolism-related enzymes, such as nitrate reductase, glutamine synthetase, and glutamic-oxaloace transaminase, thus decreasing the synthesis of chlorophyll and soluble protein, and inhibited the growth of maize seedlings. Manganese deficiency promoted the activity of glutamate dehydrogenase and reduced the toxicity of excess ammonia to the plant, while added cerium relieved the damage to nitrogen metabolism caused by manganese deficiency in maize seedlings. However, cerium addition exerted positively to relieve the damage of nitrogen metabolism process in maize seedlings caused by exposure to manganese-deficient media.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

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Effects of Manganese Deficiency and Added Cerium on Nitrogen Metabolism of Maize

Gong

Liu

et al. 2011

Biol Trace Elem Res

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“…Since La may trigger both antioxidant and prooxidant effects depending on the time and concentration to which cells are exposed to it, this REE may modify plant metabolism, including amino acids and protein biosynthesis and turnover. Moreover, La influences N metabolism in soybean seedlings, since pretreatment with the La concentration considered optimal (20 mg L −1 ) increased the activity of the enzymes nitrate reductase (NR), GS, GOGAT, and glutamate dehydrogenase (GDH), and decreased the accumulation of nitrate and ammonium (Cao et al, 2007). This means that there was an efficient transformation of inorganic N into proteins promoted by the addition of La (Pang et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

Lanthanum Affects Bell Pepper Seedling Quality Depending on the Genotype and Time of Exposure by Differentially Modifying Plant Height, Stem Diameter and Concentrations of Chlorophylls, Sugars, Amino Acids, and Proteins

et al. 2017

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Lanthanum (La) is considered a beneficial element, capable of inducing hormesis. Hormesis is a dose-response relationship phenomenon characterized by low-dose stimulation and high-dose inhibition. Herein we tested the effect of 0 and 10 μM La on growth and biomolecule concentrations of seedlings of four sweet bell pepper (Capsicum annuum L.) varieties, namely Sven, Sympathy, Yolo Wonder, and Zidenka. Seedling evaluations were performed 15 and 30 days after treatment applications (dat) under hydroponic greenhouse conditions. Seedling height was significantly increased by La, growing 20% taller in Yolo Wonder plants, in comparison to the control. Similarly, La significantly enhanced shoot diameter, with increases of 9 and 9.8% in measurements performed 15 and 30 dat, respectively, as compared to the control. Likewise, La-treated seedlings had a higher number of flower buds than the control. An increase in the number of leaves because of La application was observed in Yolo Wonder seedlings, both 15 and 30 dat, while leaf area was augmented in this variety only 30 dat. Nevertheless, La did not affect dry biomass accumulation. La effects on biomolecule concentration were differential over time. In all varieties, La stimulated the biosynthesis of chlorophyll a, b and total 15 dat, though 30 dat only the varieties Sympathy and Yolo Wonder showed enhanced concentrations of these molecules because of La. Total soluble sugars increased in La-treated seedlings 30 dat. Interestingly, while most varieties exposed to La showed a reduction in amino acid concentration 15 dat, the opposite trend was observed 30 dat. Importantly, in all varieties evaluated, La stimulated soluble protein concentration 30 dat. It is important to note that while chlorophyll concentrations increased in all varieties exposed to La, both 15 and 30 dat, those of soluble sugars and proteins consistently increased only 30 dat, but not 15 dat. Our results confirm that La may improve seedling quality by enhancing some growth parameters and biomolecule concentrations, depending on the genotype, and time of exposure.

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“…Now that the Lns are relatively available for biological functions, it may be that as plants continue to evolve while exposed to increasingly REE-rich topsoil environments, they are adapting to use certain REEs for specific metabolic and physiological processes, hence the hyperaccumulation in Carya, and especially in tetraploid Carya. Observations that certain REEs can increase photosynthesis, chlorophyll content, and nitrogen metabolism (Cao et al, 2007;Weiping et al, 2003;Xue and Yang, 2005;Yin et al, 2009), replace Ca 2+ in stomatal regulation (Xue and Yang, 2005), affect abscissic acid (ABA)-induced gene expression (Dagenbeek et al, 2000;Rock and Quatrano, 1996), replace Ca in photosystem-II (Hong et al, 2002a(Hong et al, , 2002bWang et al, 2003), replace Mg in the porphryin ring of chlorophyll (Hong et al, 2002a;Wei et al, 2005;Weiping et al, 2003), increase activity of nitrate reductase (Song et al, 2003) and glutamine synthase and glutamate dehydrogenase (Song et al, 2003;Wan et al, 2004), and improve plant growth (Boyko et al, 2011) of certain species is evidence that REEs might be beginning to be incorporated into the biology of certain species. The relatively high tolerance of most species to REEs might also be evidence of active positive biological roles.…”

Section: Potential Of a Physiological Role For Rare-earthmentioning

confidence: 99%

The Rare-earth Metallome of Pecan and Other Carya

Wood¹,

Grauke²

2011

J. Amer. Soc. Hort. Sci.

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We report the composition of the rare-earth (REE) metallome component of the foliar ionomes of pecan (Carya illinoinensis) and other North American Carya and how accumulation of specific REEs relate to ploidy level and to accumulation of essential divalent nutrient elements. REE accumulation within the foliar ionomes of 12 Carya species, growing on a common site and soil, indicates that REEs accumulate according to the Oddo-Harkins rule with Ce, La, Nd, and Y (Ce > La > Nd > Y) being the dominant REEs with accumulated concentration typically being La > Ce > Nd > Y > Gd > Pr > Sm > Dy > Er > Yb > Ho > Tb >Tm > Sc >Lu. Carya species quantitatively differ in accumulation of REEs with all but C. aquatica accumulating at much greater concentrations than non-Carya tree species and with tetraploid Carya accumulating to approximately twice the concentration as diploid Carya. Carya tomentosa was an especially heavy accumulator of REEs at 859 μg·g−1 dry weight, whereas C. aquatica was especially light at 84 μg·g−1. Accumulation of REEs was such that any one element within this elemental class was tightly linked (generally r ≥ 0.94, but 0.81 for Ce) to all others. Accumulation of REEs is negatively correlated with Ca accumulation and positively correlated with Mn and Cu accumulation in diploid Carya. In tetraploid Carya, accumulated Mg, Ca, and Fe is positively associated with foliar concentration of REEs. Total concentration of REEs in pecan's foliar ionome was 190 μg·g−1, about equivalent to that of Mn. Circumstantial evidence suggests that one or more of the physiochemically similar REEs increases physiological plasticity and subsequent adaptive fitness to certain Carya species, especially tetraploids. Because all tetraploid Carya are high REE accumulators and are native to more xeric habitats than diploids, which typically occupy mesic habitats, it appears that REEs might play a role in Carya speciation and adaptation to certain site-limiting environmental stresses. REEs appear to play an unknown metabolic/physiological role in pecan and most Carya species, especially tetraploids; thus, their nutritional physiology merits further investigation.

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Effects of lanthanum(III) on nitrogen metabolism of soybean seedlings under elevated UV-B radiation

Cited by 21 publications

References 17 publications

Effects of Manganese Deficiency and Added Cerium on Nitrogen Metabolism of Maize

Effects of Manganese Deficiency and Added Cerium on Nitrogen Metabolism of Maize

Lanthanum Affects Bell Pepper Seedling Quality Depending on the Genotype and Time of Exposure by Differentially Modifying Plant Height, Stem Diameter and Concentrations of Chlorophylls, Sugars, Amino Acids, and Proteins

The Rare-earth Metallome of Pecan and Other Carya

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