Regulation of amino acid uptake in conifers by exogenous and endogenous nitrogen

Persson, Johanna; Näsholm, Torgny

doi:10.1007/s00425-002-0786-5

Cited by 66 publications

(45 citation statements)

References 32 publications

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“…Amino acids may constitute a significant part of the N absorbed by plants in terrestrial ecosystems, especially under low N conditions (Harrison et al, 2000;Nasholm et al, 1998Nasholm et al, , 2000Nasholm et al, , 2009Persson and Nasholm, 2002). Several amino acid transporters have been described in plants, conferring ability to absorb amino acids from the soil solution (Lipson and Nasholm, 2001).…”

Section: E Gioseffi Et Al: Organic and Inorganic N Interactions In mentioning

confidence: 99%

“…They each have different specificity and affinity for amino acids (Hirner et al, 2006;Lee et al, 2007;Svennerstam et al, 2008). Amino acid transporters are less well characterised in other species but it is well documented that amino acid uptake occurs in a wide range of species including gymnosperms (Nasholm et al, 1998;Persson and Nasholm, 2002), dicots (Ge et al, 2009;Kielland, 1994;Nasholm et al, 1998Nasholm et al, , 2000Streeter et al, 2000) and monocots (Biernath et al, 2008;El-Naggar et al, 2009;Henry and Jefferies, 2003;Jamtgard et al, 2008Jamtgard et al, , 2010Kielland, 1994;Lipson et al, 1999;Nasholm et al, 1998Nasholm et al, , 2000Nasholm and Persson, 2001;Schimel and Chapin, 1996;Streeter et al, 2000;Thornton, 2001;Thornton and Robinson, 2005;Yamagata and Ae, 1999). However, the importance and significance of organic N as a source of crop N under different management systems is still not well established.…”

Section: E Gioseffi Et Al: Organic and Inorganic N Interactions In mentioning

confidence: 99%

“…The existing knowledge about these interactions is mainly based on experimental approaches in which plants have been pretreated with amino acids and subsequently exposed to NO − 3 or NH + 4 or vice-versa (e.g. Persson and Nasholm, 2002). In most cases, inorganic N absorption is down-regulated following pre-treatment with amino acids, although the actual responses are quite variable and may also depend on the N form used during the pre-treatment (Thornton, 2004).…”

Section: E Gioseffi Et Al: Organic and Inorganic N Interactions In mentioning

confidence: 99%

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Interactions between uptake of amino acids and inorganic nitrogen in wheat plants

2012

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Abstract. Soil-borne amino acids may constitute a source of nitrogen (N) for plants in various terrestrial ecosystems but their importance for total N nutrition is unclear, particularly in nutrient-rich arable soils. One reason for this uncertainty is lack of information on how the absorption of amino acids by plant roots is affected by the simultaneous presence of inorganic N forms. The objective of the present study was to study absorption of glycine (Gly) and glutamine (Gln) by wheat roots and their interactions with nitrate (NO − 3 ) and ammonium (NH + 4 ) during uptake. The underlying hypothesis was that amino acids, when present in nutrient solution together with inorganic N, may lead to down-regulation of the inorganic N uptake, thereby resulting in similar total N uptake rates. Amino acids were enriched with double-labelled 15 N and 13 C, while NO − 3 and NH + 4 acquisition was determined by their rate of removal from the nutrient solution surrounding the roots. The uptake rates of NO − 3 and NH + 4 did not differ from each other and were generally about twice as high as the uptake rate of organic N when the different N forms were supplied separately in concentrations of 2 mM. Nevertheless, replacement of 50 % of the inorganic N with organic N was able to restore the N uptake to the same level as that in the presence of only inorganic N. Co-provision of NO − 3 did not affect glycine uptake, while the presence of glycine down-regulated NO − 3 uptake. The ratio between 13 C and 15 N were lower in shoots than in roots and also lower than the theoretical values, reflecting higher C losses via respiratory processes compared to N losses. It is concluded that organic N can constitute a significant N-source for wheat plants and that there is an interaction between the uptake of inorganic and organic N.

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Section: E Gioseffi Et Al: Organic and Inorganic N Interactions In mentioning

confidence: 99%

Section: E Gioseffi Et Al: Organic and Inorganic N Interactions In mentioning

confidence: 99%

Section: E Gioseffi Et Al: Organic and Inorganic N Interactions In mentioning

confidence: 99%

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Interactions between uptake of amino acids and inorganic nitrogen in wheat plants

2012

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“…더욱이 아미노산 트랜스포터가 몇 가지의 식물 종 에서 동정되었고, 아미노산 흡수의 메커니즘에 대한 연구 도 진행되고 있다 (Frommer et al, 1993;Montamat et al, 1999;Neelam et al, 1999;Persson and Nasholm, 2002;Persson and Nasholm, 2003;Zhou et al, 1999). 특히, …”

Section: 한편 많은 식물 종에서 시용한 아미노산을 비교적 높은unclassified

Effect of the Hydrolysate of Pigs Hoof on Plant Growth and Physico-chemical Properties

Han¹,

Cho²,

Jeon³

2011

Korean Journal of Soil Science and Fertilizer

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This study was conducted to find the physico-chemical properties and the amino acid content of the pigs hoof hydrolysate, keratin protein and to investigate its fertilizer effect on the growth of crops. The keratin proteins such as pigs hoof were alkali-hydrolyzed to produce the hydrolysates. The chemical properties of the hydrolysate of pigs hoof was 6~7 of pH and 10~15 dS m -1 of EC. Total amino acid contents released from the pigs hoof were 10.18%, respectively. The pot experiment was carried out for the cultivation of lettuce. The treatment design of these pot cultivation was composed of Control (compost + NPK), PHH-0.5, PHH-1.0, PHH-2.0 (×2,000 ; 1,000 ; 500 diluted solution of pig hoof hydrolysate). After lettuce cultivation, the pH values in all treatment soils were decreased than those in initial soils, and the exchangeable cation value was higher than that of control. In all PHH treatments, lettuce growth was better in the leaf length by 6~16% and the leaf width by 4~15% than in control. Therefore, the PHH solutions manufactured by hydrolysis process had plenty of amino acids, and among them PHH had the most abundant nutrients and amino acids with highest growth and yield effect on lettuce.

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“…Experiments of amino acid uptake from incubation solutions [26,27] and soils [28,27], using many plant species representing a wide variety of plant types, have shown that rates of organic N uptake can be high compared with that of inorganic N in these ecosystems. This conclusion took into account free amino acid concentration in soils and root uptake kinetics [6,19,14].…”

Section: Bromeliads and Orchidsmentioning

confidence: 99%

Absorção e assimilação de uréia pela bromélia epífita com tanque Vriesea gigantea

Cambuí¹

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A todos os colegas de laboratório, do IBUSP e do Instituto de Botânica, que estiveram envolvidos no desenvolvimento deste trabalho.Ao Rosário, alunos e professores do Laboratório de Ficologia do IBUSP, por estarem sempre dispostos a ajudar, seja doando N líquido, seja emprestando equipamentos ou reagentes.A toda a equipe do laboratório, técnicos, colegas de trabalho, todas as pessoas que direta ou indiretamente me ajudaram durante o desenvolvimento deste trabalho.Aos professores, técnicos e alunos do Laboratório de Biologia Molecular da USP, pelas dicas valiosas, pelos ensinamentos teóricos e práticos, além da disponibilização de equipamentos e reagentes.A todos os funcionários do IBUSP que permitiram, direta ou indiretamente, o desenvolvimento deste trabalho.Ao Erich, pelo amor, carinho e dedicação, mesmo estando na maioria das vezes tão longe.Obrigada pelo companheirismo, pela confiança, paciência e preocupação constante. Agradeço por estar sempre disposto a me ajudar, das mais diversas maneiras, desde lavando vidrarias ou macerando plantas, até nas discussões dos meus resultados.À minha família, pelo amor incondicional, paciência e apoio em todos os momentos. Por serem exemplos de caráter e de dedicação. Obrigada por me oferecem todas as oportunidades para que eu chegasse onde estou hoje. E tenham certeza que sempre terei comigo seus mais preciosos ensinamentos de vida.A todos aquele aqui não mencionados, mas que me auxiliaram na execução deste trabalho. INTRODUÇÃO GERALO hábitat epifítico representa um ambiente altamente dinâmico, sujeito a variações temporais e espaciais de intensidade luminosa, disponibilidade de água e de nutrientes (Nadkarni e Primack, 1989;Reich et al., 2003), sendo por muitos considerado um dos ambientes mais áridos e inférteis já ocupados pelas plantas vasculares. Embora se estime que aproximadamente 10% de todas as plantas vasculares sejam epífitas, poucos táxons estão representados nesse ambiente, na sua grande maioria monocotiledôneas. Mais de 30% das plantas pertencentes a esse clado são epífitas, enquanto meros 2% das dicotiledôneas se qualificam como tal.Dentre as monocotiledôneas, grande destaque tem a família Bromeliaceae, segunda maior representante em número de espécies epífitas dentro das angiospermas (Benzing, 1987). Devido ao seu pronunciado epifitismo e importância ecológica em muitas comunidades tropicais e subtropicais do Novo Mundo, por muitos anos essa família tem atraído a atenção de pesquisadores. Dentre os maiores interesses está a elucidação das diversas adaptações que permitem as bromélias viver em habitats tão incomuns. Exemplos são os trabalhos publicados por Benzing e Renfrow (197la, b), Benzing (1973), Benzing et al. (1976), Benzing et al. (1978), Nyman et al (1987), Zotz e Andrade (1998), Inselsbacher et al. (2009), dentre muitos outros, que documentaram a existência da combinação de especializações funcionais e estruturais únicas bastante efetivas para lidar com esse ambiente usualmente seco e estéril.De acordo com diversos autores, a ocorrência de tric...

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Regulation of amino acid uptake in conifers by exogenous and endogenous nitrogen

Cited by 66 publications

References 32 publications

Interactions between uptake of amino acids and inorganic nitrogen in wheat plants

Interactions between uptake of amino acids and inorganic nitrogen in wheat plants

Effect of the Hydrolysate of Pigs Hoof on Plant Growth and Physico-chemical Properties

Absorção e assimilação de uréia pela bromélia epífita com tanque Vriesea gigantea

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