Manganese Uptake by Excised Oat Roots

Page, E. R.; Dainty, J.

doi:10.1093/jxb/15.3.428

Cited by 30 publications

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“…Trebi 6.0 or greater, nylon bags containing analytical grade Bio-Rad AG1-X8 anion exchange resin in the OH-form were dipped into the solution (7). All salts used were chlorides of analyzed reagenit grade.…”

Section: Methodsmentioning

confidence: 99%

“…Su'bsequent experiments with red beet discs cionfirmed this interpretation (9). More recently, Page and Dainty (6) 'have reported -that the uptake of !Mn by excised oat rooits is nonmetabolic. Both the characteristic rapid initial uptake and the folllowing slower steadystate tuptake occturretd independentlly of metabolic .ac-tivity.…”

mentioning

confidence: 93%

“…Both the characteristic rapid initial uptake and the folllowing slower steadystate tuptake occturretd independentlly of metabolic .ac-tivity. 6.0 or greater, nylon bags containing analytical grade Bio-Rad AG1-X8 anion exchange resin in the OH-form were dipped into the solution (7). All salts used were chlorides of analyzed reagenit grade.…”

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confidence: 99%

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Manganese Absorption by Excised Barley Roots

1968

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Abstract. Short-term absorption studies with 5-day-old excised barley roots revealed that the basic aspects of Mn absorption were similar to those of other metab-olically absorbed cations. Following an initial non-metabolic equilibration with the root, Mn was absorbed for several hours at a slower steady-state rate comparable to that of other inorganic cations. Complete or nearly complete inhibition of the steady-state phase by low temperature, dinitrophenol, and azide provides strong evidence that Mn transport into this tissue was metabolically mediated. Within limits, the rate of transport was strongly dependent upon the concentrations of Mn and the hydrogen ions in the ambient solution. Absorption increased rapidly with increasing concentrations of Mn up to 1 meq per liter. Above this concentration, the rate leveled off, apparently due to a saturation of the transport mechanism. Within the physiologioal pH range in which Mn is soluble (below pH 7), absorption increased greatly with decreasing hydrogen-ion concentration.Altho,ugh numerous investigations of ion uptake by excised root tissue have been conducted, relative:ly 1little attention has been given to Mn. In 1934, Laine (4) studied the absorption of Mn and other ions by decapitated roots of Phaseoluts multiflorus. Analyses of both the exudate and the roots revealed an accumu,lation and retention of Mn by the roots. Using slices of carrolt tissue, Stiles and Skelding (10) found that Mn uptake occurred in 29 distinct phases, a rapid initial uptake followed by a pro,longed slower absorption. This 2-step process, characteristic of the uptake of other cations, was in(terpreted as consi,sting of the usual nonmetabo,lic and metabolic phases, respectively. Su'bsequent experiments with red beet discs cionfirmed this interpretation (9). More recently, Page and Dainty (6) 'have reported -that the uptake of !Mn by excised oat rooits is nonmetabolic. Both the characteristic rapid initial uptake and the folllowing slower steadystate tuptake occturretd independentlly of metabolic .ac-tivity. 6.0 or greater, nylon bags containing analytical grade Bio-Rad AG1-X8 anion exchange resin in the OH-form were dipped into the solution (7). All salts used were chlorides of analyzed reagenit grade.At the end of the absorption periood, the roots were coillected on a nylon screen and washed by pouring 3 4liters of distilled water over them. After drying overnight at 700, the roots were digested in nitric and perchloric acids and diluited to 100 ml. 527 www.plantphysiol.org on May 11, 2018 -Published by Downloaded from

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Section: Methodsmentioning

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Manganese Absorption by Excised Barley Roots

1968

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“…É absorvido na forma de Mn 2+ pelas raízes e acumulado nos compartimentos do apoplasto e simplasto em três frações distintas: a forma trocável, referente ao apoplasto, está adsorvida às cargas negativas na matriz péctica da parede celular; a forma lábil, associada ao Mn localizado no citoplasma; e a forma não-lábil, referente ao Mn depositado nos vacúolos (Munns et al, 1963;Page & Dainty, 1963;Wang, 2003).…”

Section: Introductionunclassified

Influência genotípica na absorção e na toxidez de manganês em soja

Lavres

Moraes

Cabral

et al. 2008

Rev. Bras. Ciênc. Solo

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“…Although the literature abounds with reports related to various aspects of ion uptake by plant tissues, it has only been recently that attention has been directed toward the micro-nutrient elements (1,3,14,18,22). The dearth of data on micro-nutrient absorption is no doubt duie at least in part to the fact that the physiological concentrations of these elements are qtuite low, as are their rates of absorption.…”

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Absorption of Copper, Zinc, and Manganese by Sugarcane Leaf Tissue

Bowen

1969

Plant Physiol.

164

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Abstract. The absorption of Cu21, Zn2', and Mn2' by leaf tissue of 4-month old sugarcane plants (Saceharum officinarum L., var. H53-263) has been investigated. After the "apparent free space" fraction was desorbed, the absorption of Cu2+, Mn2 , and Zn2+ yielded a curve typical of many ion uptake processes when measured as a function of the external concentration. However, only 1 absorption mechanism was evident for each cation. The pH optimum for Cu2+ and Zn2+ uptake was 5.0 to 6.0, whereas that for Mn2+ absorption was 4.5 to 6.0. Absorption was competitively inhibited by H4-, and this inhibition was reversible when 0.5 mM Ca2+ was present. Cu2+ and Zn2+ were absorbed through the same carrier sites, as concluded from their mutually competitive activities. Mn2+ was absorbed through a second, independent mechanism. Uptake of each cation was strongly inhibited by uncouplers of oxidative phosphorylation, by Amytal and Nembutal2, by 5 X 10-2 M succinate, and by ADP and P1. Absorption of Cu21, Zn2+, and Mn24 was concluded to be coupled to oxidative phosphorylation, and specifioally to energy-conservation Site I.

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Manganese Uptake by Excised Oat Roots

Cited by 30 publications

References 0 publications

Manganese Absorption by Excised Barley Roots

Manganese Absorption by Excised Barley Roots

Influência genotípica na absorção e na toxidez de manganês em soja

Absorption of Copper, Zinc, and Manganese by Sugarcane Leaf Tissue

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