Mechanisms of Manganese Acquisition by Roots from Soils

Marschner, H.

doi:10.1007/978-94-009-2817-6_14

Cited by 84 publications

(52 citation statements)

References 71 publications

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“…The results presented in this study are consistent with those presented earlier (Baxter and Osman, 1988;Marschner, 1988, Moraghan, 1979Wikoff and Moraghan, 1986;Zaharieva, 1986;Zaharieva et aI., 1988) for a significant decrease in Mn uptake with FeED-DHA applications to a calcareous soil. Baxter and Osman (Baxter and Osman, 1988) explained the inhibited Mn acquisition by soybean plants in the frame of Strategy I uptake model for Fe.…”

Section: Discussionsupporting

confidence: 94%

“…Considering Fe stress response mechanism of Strategy I, the peanut roots would be expected to increase plasma membrane reductase activity and net excretion of protons, and enhance the release of reducing compounds, mainly phenolics. These changes, which favour Fe mobilization in the rhizosphere, should also increase the solubility of soil Mn (Marschner, 1988;Moraghan, 1979;Romheld and Marschner, 1983). Higher accumulation of Mn by peanut plants, which we found in the zero-Fe-treatment may be due to soil-Mn availability being increased in the rhizosphere as a result of plant Fe stress response.…”

Section: Discussionmentioning

confidence: 65%

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Iron-manganese interactions in peanut plants as influenced by the source of applied iron

Zaharieva

1995

Iron Nutrition in Soils and Plants

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Section: Discussionsupporting

confidence: 94%

Section: Discussionmentioning

confidence: 65%

Iron-manganese interactions in peanut plants as influenced by the source of applied iron

Zaharieva

1995

Iron Nutrition in Soils and Plants

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“…The higher potential for Mn reduction than oxidation in the soil (Table 2) additional experiments: incubation of soil with addition of either only glucose or glucose and MnOj did not change the amount of exchangeable (reduced) Mn, and similarly soil incubation with additions of MnSO4 ^^^ glucose showed a higher potential for oxidation than for reduction (data not shown). Thus, depending on the prevailing oxidation stage of Mn in the rhizosphere soil, changes in rhizosphere microorganisms population may either increase or decrease the amount of available Mn (Mn^") in the rhizosphere (Marschner, 1988). In the present study, root colonization with the mycorrhizal fungi decreased the Mn^'^-reducing potential or the amount of reduced Mn in the rhizosphere soil and hence the availability of Mn for the plant.…”

Section: Discussionmentioning

confidence: 50%

“…The overall microbial Franson (1989) (Marschner, 1988). In addition, some of the microbial metabolites are also thought to be potential reductants of sparingly soluble Mn oxides (Uren, 1989).…”

mentioning

confidence: 99%

Effect of a vesicular–arbuscular mycorrhizal fungus and rhizosphere micro‐organisms on manganese reduction in the rhizosphere and manganese concentrations in maize (Zea mays L.)

1991

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SUMMARYMaize {Zea mays L. cv. Tau) plants were grown in a calcareous soil for six weeks in pots having separate compartments for growth of roots and vesicular-arbuscular (VA) mycorrhizal fungal hyphae. Soil was sterilized and either left non-inoculated (sterile treatment), or was inoculated with rhizosphere micro-organisms only (MO -VA) or with rhizosphere micro-organisms together with a VA mycorrhizal fungus [Glomus mosseae (Nicol. & Gerd.) Gerdemann & Trappe (MO-I-VA)]. Concentrations of Mn in roots and shoots, as well as exchangeable Mn in rhizosphere soil, decreased in the order MO -VA > MO-t-V.-^ > sterile treatment. In all treatments, the concentration of exchangeable Mn was lower in the rhizosphere soil (0-5 mm distance from the root surface) thati in the bulk soil (5-15 or 15-25 mm distance from the root surface). In the rhizosphere soil, the total microbial population was sitnilar in mycorrhizal (MO-l-VA) and non-mycorrhizal (MO -VA) treatments, but the proportion of Fe-or Mti-reducers was 20-to 30-fold higher in the non-mycorrhizal treatment, suggesting substantial qualitative changes in rhizosphere microbiai populations upon root infection with the mycorrhizal fungi. The Mn^'''-reducing potential (net balance between reduction and oxidation) in the rhizosphere soil was also distinctly lower in mycorrhizal treattnent compared to non-mycorrhizal tt-eatment.In the sterile treatment, low Mn*'^ -reducing potential and correspondingly low concentration of exchangeable Mn in soil, compared to the other treatments, indicates the importance of micro-organisms in Mn reduction in soil and acquisition of Mn by plants. Therefore, the lower Mn concentrations in mycorrhizal plants are most probably caused by a shift in composition and activity of rhizosphere micro-organisms. As a side effect of the treatments, improved soil aggregation, as indicated by soil adhering to the nylon net (facing hyphal compartments) after platit harvest, occurred in non-mycorrhizal and sterile treatments but not in the mycorrhizal treatment.

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“…Microbial activity in the rhizosphere may increase or decrease the availability of Mn to plant roots depending on the proportion and activity of Mn oxidizing and reducing microorganisms (Marschner, 1988).…”

Section: Introductionmentioning

confidence: 99%

Direct and indirect effects of VA mycorrhizal fungi and rhizosphere microorganisms on acquisition of mineral nutrients by maize (Zea mays L.) in a calcareous soil

Kothari¹,

Marschner²,

Römheld³

1990

New Phytologist

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166

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SUMMARYMaize {Zea mays L.) was grown in a fertilized calcareous soil in pots which were separated by 30 /tm nylon nets into three compartments, a central one for root growth and two outer ones for hyphal growth. The treatments comprised of sterilised soil, either inoculated with rhizosphere microorganisms together with Glomus mosseae (Nicol. & Gerd.) Gerdemann & Trappe, with rhizosphere microorganisms alone, or non-inoculated (sterile control).In the mycorrhizal treatment concentrations of P and Zn were increased in shoot and roots, as was uptake of P and Zn per unit root dry weight or per unit root length. Copper concentration in roots of mycorrhizal plants, and total uptake and uptake per unit root dry weight or per unit root length of Cu was also increased. The higher acquisition of P, Zn and Cu in the mycorrhizal plants is ascribed to VA mycorrhiza per se (hyphal uptake and translocation to the host). Besides these direct effects, VA mycorrhizal fungi and rhizosphere microorganisms affected the acquisition of other nutrients mostly through alteration of root morphology. In both mycorrhizal and sterile treatments, the decreased concentrations of Ca and Si in the shoot but increased concentrations in the roots seem to be related to restricted apoplasmic solute transport across the endodermal barrier due to decreased number of lateral roots.The concentration of K in both shoot and roots, and Fe in shoot were lower in mycorrhizal plants due to reduced root length. Manganese concentration was also distinctly lower in both shoot and roots in mycorrhizal and sterile treatments, an effect which is attributed to the decrease in Mn reduction in the rhizosphere. Irrespective of nutrient, the uptake per unit root length was higher in mycorrhizal plants, probably due to hyphal contribution and increased supply of nutrients to the root surface by mass flow. Soil analysis indicates hyphal translocation of K but not Mg.The results demonstrate that effects of VA mycorrhizal infection on root morphology and rhizosphere microorganisms have to be considered in interpretations of mycorrhizal efFects on mineral nutrient acquisition.

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Mechanisms of Manganese Acquisition by Roots from Soils

Cited by 84 publications

References 71 publications

Iron-manganese interactions in peanut plants as influenced by the source of applied iron

Iron-manganese interactions in peanut plants as influenced by the source of applied iron

Effect of a vesicular–arbuscular mycorrhizal fungus and rhizosphere micro‐organisms on manganese reduction in the rhizosphere and manganese concentrations in maize (Zea mays L.)

Direct and indirect effects of VA mycorrhizal fungi and rhizosphere microorganisms on acquisition of mineral nutrients by maize (Zea mays L.) in a calcareous soil

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