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首页> 外文期刊>Plant and Soil >Copper uptake and translocation in chicory (Cichorium intybus L. cvGrasslands Puna) and tomato (Lycopersicon esculentum Mill. cv Rondy)plants grown in NFT system. II. The role of nicotianamine and histidine inxylem sap copper transport
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Copper uptake and translocation in chicory (Cichorium intybus L. cvGrasslands Puna) and tomato (Lycopersicon esculentum Mill. cv Rondy)plants grown in NFT system. II. The role of nicotianamine and histidine inxylem sap copper transport

机译：在NFT系统中生长的菊苣（菊苣（Cichorium intybus L. cvGrasslands Puna）和番茄（Lycopersicon esculentum Mill。cv Rondy）植物中的铜吸收和转运。二。烟碱胺和组氨酸木质部汁液铜转运的作用

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摘要

The effect of rooting media Cu concentration (0.05-20 mg Cu L-1) on amino acid concentrations and copper speciation in the xylem sap of chicory and tomato plants was measured using 6 week old plants grown in a nutrient film technique system (NFT). Irrespective of the Cu concentration in the nutrient solutions, more than 99.68% and 99.74% of total Cu in tomato and chicory xylem sap was in a bound form. When exposed to high Cu concentrations in the rooting media, amino acid concentrations in the sap increased. Relative to other amino acids, the concentrations of glutamine (Gln), histidine (His), asparagine (Asn), valine (Val), nicotianamine (NA) and proline (Pro) in tomato xylem saps, and His, gamma-aminobutyric acid (Gaba), glutamic acid (Glu), leucine (Leu), NA and phenylalanine (Phe) in chicory xylem saps showed the greatest increases. The data indicate that induced synthesis of some free amino acids as a specific and proportional response to Cu treatment. For a single complexation amino acid, the solution Cu(2+)concentration vs pH titration curve for NA at 0.06-0.07 mM was most similar, closely followed by His at 0.5-0.6 mM, to the solution Cu(2+)concentration behaviour in both tomato and chicory xylem sap. It is concluded that increased Cu concentrations in the rooting media induced selective synthesis of certain amino acid which include NA, His, Asn and Gln which have high stability constants with Cu. NA and His have the highest binding constants for Cu and the concentrations of NA and His in chicory and tomato xylem saps can account for all the bound Cu carried in the sap.
机译：使用在营养膜技术系统（NFT）中生长的6周龄植物测量生根培养基Cu浓度（0.05-20 mg Cu L-1）对菊苣和番茄植物木质部汁液中氨基酸浓度和铜形态的影响。 。无论营养液中的Cu浓度如何，番茄和菊苣木质部汁液中总Cu的99.68％和99.74％都是结合形式。当在生根培养基中暴露于高浓度的铜时，汁液中的氨基酸浓度增加。相对于其他氨基酸，番茄木质素液中谷氨酰胺（Gln），组氨酸（His），天冬酰胺（Asn），缬氨酸（Val），烟碱胺（NA）和脯氨酸（Pro）的浓度以及His，γ-氨基丁酸的浓度菊苣木质部汁液中的谷氨酸（Gaba），谷氨酸（Glu），亮氨酸（Leu），NA和苯丙氨酸（Phe）表现出最大的增长。数据表明，诱导的某些游离氨基酸合成是对Cu处理的特异性和成比例反应。对于单个络合氨基酸，溶液中Cu（2+）浓度与pH滴定曲线的关系在0.06-0.07 mM处与溶液Cu（2+）浓度行为最为相似，紧随其后的是在0.5-0.6 mM处的His。在番茄和菊苣木质部树液中。结论是生根介质中铜的浓度增加会诱导某些氨基酸的选择性合成，这些氨基酸包括与铜具有高稳定性常数的NA，His，Asn和Gln。 NA和His对Cu的结合常数最高，菊苣和番茄木质部汁液中NA和His的浓度可以解释汁液中所有结合的Cu。

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