Chemical nature of manganese in the leaves of manganese accumulator plants

Memon, Abdul Razaque; Yatazawa, Michihiko

doi:10.1080/00380768.1982.10433655

Cited by 23 publications

(14 citation statements)

References 18 publications

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“…The selection of oxalate, citrate, malonate, malate and succinate as possible Mn‐binding ions was based on papers on ligands associated with foliar Mn in accumulator plants (Memon & Yatazawa, 1982; González & Lynch, 1999; Harper et al. , 1999; Bidwell et al.…”

Section: Methodsmentioning

confidence: 99%

“…The aim here was to employ synchrotron XAS in a comparative study to screen a range of Mn (hyper)accumulators from that region, in order to elucidate their foliar Mn speciation and to investigate possible variation consistent with the spatial distribution of foliar Mn in these species. XAS was chosen because it is an in situ technique, in contrast to other far less direct methodologies that have previously been applied to some of the species under present investigation (Memon & Yatazawa, 1982; Bidwell et al. , 2002).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of foliar manganese (Mn) in Mn (hyper)accumulators using X‐ray absorption spectroscopy

et al. 2010

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Summary Plant hyperaccumulation of the essential nutrient manganese (Mn) is a rare phenomenon most evident in the Western Pacific region, and differs from hyperaccumulation of other elements. Mn hyperaccumulators employ a variety of species‐dependent spatial distribution patterns in sequestering excess foliar Mn, including primary sequestration in both nonphotosynthetic and photosynthetic tissues. This investigation employed synchrotron X‐ray absorption spectroscopy (XAS) in a comparative study of Mn (hyper)accumulators, to elucidate in situ the chemical form(s) of foliar Mn in seven woody species from Australia, New Caledonia and Japan. Foliar Mn was found to predominate as Mn(II) in all samples, with strong evidence of the role of carboxylic acids, such as malate or citrate, as complexing ligands. Overall, the X‐ray absorption near‐edge spectroscopy (XANES) and extended X‐ray absorption fine‐structure spectroscopy (EXAFS) data appeared weighted against previous observations that oxalate binds excess Mn in Mn‐(hyper)accumulating species.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of foliar manganese (Mn) in Mn (hyper)accumulators using X‐ray absorption spectroscopy

et al. 2010

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“…The method of successive extraction was adopted to obtain different chemical fractions of Mn (Memon & Yatazawa 1982). Basically, leaves were extracted with deionized water three times, centrifuged, and the supernatant was collected as the fraction of water‐soluble Mn.…”

Section: Methodsmentioning

confidence: 99%

Accumulation and detoxification of manganese in hyperaccumulatorPhytolacca americana

Dou

Chen

et al. 2009

Plant Biology

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Pokeweed (Phytolacca americana) has recently received much attention because of its ability to hyperaccumulate manganese (Mn). The internal mechanism of detoxification of Mn, however, is not fully understood. In the present study, we investigated Mn accumulation, subcellular distribution, chemical speciation and detoxification through oxalate in pokeweed. The plant accumulated excess Mn in the leaves, mainly in the water-soluble fraction, and over 80% of Mn was in a water-soluble form, while accumulation of excess Mn in the cellular organelle and membrane fraction caused phytotoxicity. In addition, pokeweed has an intrinsically high oxalate content. In all experiments, there was sufficient oxalate to chelate Mn in leaf water extracts at all different levels of Mn application. Phase analysis of X-ray diffraction detected oxalate-Mn chelate complexes, and gel chromatography further confirmed the chelation of Mn by oxalate. In conclusion, pokeweed accumulates excess Mn in the soluble fraction of leaf cells, most likely in vacuoles, in which detoxification of Mn could be achieved by chelation with oxalate.

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“…Mn is compartmentalized in either the cell walls of the epidermis, collenchyma, bundle sheath cells and/or vacuoles and, as such, it is isolated from metabolically active compartments such as the cytosol, mitochondria and chloroplast (Memon et al 1980(Memon et al , 1981Memon and Yatazawa 1982). Blamey et al (1986) and Horiguchi (1987) suggested that the oxidation of excess Mn in plant shoots may be alternative mechanism for plant Mn tolerance.…”

Section: Introductionmentioning

confidence: 98%

Distribution and mobility of manganese in the hyperaccumulator plant Phytolacca acinosa Roxb. (Phytolaccaceae)

Shi

Chen

et al. 2006

Plant Soil

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The distribution and mobility of manganese (Mn) in the hyperaccumulator plant species Phytolacca acinosa Roxb. (Phytolaccaceae) were investigated in a hydroponic system. The plants were exposed to 2 or 5 mM Mn for up to 28 days. For any given plant, the Mn content in the mature leaves (nos. 5-9) was always higher than that in the old (nos. 1-4) and young leaves (nos. 10-14). Within the different parts of a leaf, Mn was preferentially accumulated in the leaf marginal area, where the observed level was threefold higher than that in the midrib. Crosssectional analysis of the leaf revealed that the concentration of Mn was higher in the leaf epidermis than in the mesophyll. Cell fractionation analysis with P. acinosa leaves showed that most of the Mn (78.4%) was present in the final supernatant fraction (following centrifugation at 20,000 g for 45 min). The distribution of Mn in the leaves of P. acinosa was controlled mainly by the transpiration rate. Our investigation demonstrated that Mn was readily transported from the roots to shoots of P. acinosa but that it could not be remobilized readily after it reached leaves.

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Chemical nature of manganese in the leaves of manganese accumulator plants

Cited by 23 publications

References 18 publications

Characterization of foliar manganese (Mn) in Mn (hyper)accumulators using X‐ray absorption spectroscopy

Characterization of foliar manganese (Mn) in Mn (hyper)accumulators using X‐ray absorption spectroscopy

Accumulation and detoxification of manganese in hyperaccumulatorPhytolacca americana

Distribution and mobility of manganese in the hyperaccumulator plant Phytolacca acinosa Roxb. (Phytolaccaceae)

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