Seasonal changes in Cu, Mn, Zn and Co concentrations in soil in the root‐zone of barley (<i>Hordeum vulgare</i> L.)

Lineman, D. J.; Sinclair, A. H.; Mitchell, Madeline

doi:10.1111/j.1365-2389.1989.tb01258.x

Cited by 43 publications

(21 citation statements)

References 19 publications

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“…The key role of root exudates in increasing Mn or Cu solubility has been previously reported (Bromfield, 1958;Charlanes, 1960;Nielsen, 1976;Godo and Reisenauer 1980;Jauregui and Reisenauer, 1982;Linehan et al, 1989;Merckx et al, 1986;Mench et al, 1987;Uren, 1981), using batch systems, pot and field plants. However, available data are mainly derived from graminaceous species, and in general the effect of root exudates and microbial products could not be easily distinguished.…”

Section: Discussionmentioning

confidence: 99%

“…As a result, concentrations of Cu, Zn, Mn and Co in the soil solution increase when plants are present (Linehan et al, 1989). Root exudates may influence nutrient solubility and uptake indirectly through their effects on microbial activity, rhizosphere physical properties and root growth patterns, and directly by acidification, chelation, precipitation and oxidation-reduction reactions (Uren and Reisenauer, 1988).…”

Section: Introductionmentioning

confidence: 99%

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Mobilization of cadmium and other metals from two soils by root exudates of Zea mays L., Nicotiana tabacum L. and Nicotiana rustica L.

1991

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Soluble root exudates were collected from three plants (Nicotiana tabacum L., Nicotiana rustica L. and Zea mays L.), grown under axenic and hydroponic conditions, in order to study their metal-solubilizing ability for Cd and other cations (Cu, Fe, Mn, Ni, Zn). Nicotiana spp. and Zea mays L. root exudates differed markedly in C/N ratio, sugars vs. amino acids ratio and organic acids content. Metals from two soils were extracted with either root exudate solutions, containing equal amounts of organic carbon, or distilled water as control. In the presence or absence of root exudates, the solubility of Fe and Mn was much higher than of the four other metals tested. Root exudates increased the solubilities of Mn and Cu, whereas those of Ni and Zn were not affected. Root exudates of Nicotiana spp. enhanced the solubility of Cd. The extent of Cd extraction by root exudates (N. tabacum L. > N. rustica L. > Zea mays L.) was similar to the order of Cd bioavailability to these three plants when grown on soil. An increase in Cd solubility in the rhizosphere of apical root zones due to root exudates is likely to be an important cause of the relatively high Cd accumulation in Nicotiana spp.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mobilization of cadmium and other metals from two soils by root exudates of Zea mays L., Nicotiana tabacum L. and Nicotiana rustica L.

1991

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“…This difference reflected the fact that Vanessa had almost 4 times higher maximum uptake capacity (V max ) per unit root DW compared to Antonia, while there was no difference in the K m value, which ranged from 2.7 to 5.4 nM ( Table I). The identification of a HATS for Mn, operating in the low nanomolar range, is new and highly relevant for Mn acquisition by plants because the Mn concentration in bulk soil solution normally is in the low micromolar range (Linehan et al, 1989). Diffusion limitation may further reduce the Mn 21 concentration in the rhizosphere to a level considerably below that in the bulk soil solution, thereby increasing the importance of effective uptake in the low nanomolar range.…”

Section: Discussion Kinetics For Mn Influxmentioning

confidence: 99%

Differential Capacity for High-Affinity Manganese Uptake Contributes to Differences between Barley Genotypes in Tolerance to Low Manganese Availability

Pedas¹,

Hebbern²,

Schjøerring³

et al. 2005

Plant Physiology

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There is considerable variability among barley (Hordeum vulgare) genotypes in their ability to grow in soils containing a low level of plant available manganese (Mn). The physiological basis for the tolerance to low Mn availability is unknown. In this work, Mn 21 influx and compartmentation in roots of the Mn-efficient genotype Vanessa and the Mn-inefficient genotype Antonia were investigated. Two separate Mn transport systems, mediating high-affinity Mn 21 influx at concentrations up to 130 nM and lowaffinity Mn 21 influx at higher concentrations, were identified in both genotypes. The two genotypes differed only in high-affinity kinetics with the Mn-efficient genotype Vanessa having almost 4 times higher V max than the inefficient Antonia, but similar K m values. Online inductively coupled plasma-mass spectrometry measurements verified that the observed differences in highaffinity influx resulted in a higher Mn net uptake of Vanessa compared to Antonia. Further evidence for the importance of the differences in high-affinity uptake kinetics for Mn acquisition was obtained in a hydroponic system with mixed cultivation of the two genotypes at a continuously low Mn concentration (10-50 nM) similar to that occurring in soil solution. Under these conditions, Vanessa had a competitive advantage and contained 55% to 75% more Mn in the shoots than did Antonia. Subcellular compartmentation analysis of roots based on 54 Mn 21 efflux established that up to 93% and 83% of all Mn was present in the vacuole in Vanessa and Antonia, respectively. It is concluded that differential capacity for high-affinity Mn influx contributes to differences between barley genotypes in Mn efficiency.

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“…The soil was immediately sieved (<6 mm) and soil solution removed from 200 g of field moist soil using a centrifugation technique (2000 g for 1 h at 15°C) (Linehan et al 1989). P release through plant and microbial cell rupture has been reported to be minimal at such speed (Zabowski, 1989).…”

Section: Soil and Fertilber Treatmentsmentioning

confidence: 99%

Phosphorus fractions in soil solution: Influence of soil acidity and fertiliser additions

Vaz¹,

Edwards²,

Shand³

et al. 1993

Plant Soil

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The influence of soil acidity and phosphorus fertilization on phosphorus fractions and dissolved organic carbon (DOC) in soil solution was quantified experimentally in an iron humus podzol. Soil solution was isolated by centrifugation from top-and sub-soil samples. Total dissolved phosphorus (TDP), dissolved reactive phosphorus (DRP), dissolved organic phosphorus (DOP) and DOC increased as soil pH and P status increased. DOP was the fraction present at the highest concentration (0.080-0.464 mg P L -1) for the majority of samples. DOC and DOP concentrations which remained relatively constant down the soil profile were also highly correlated. Soluble organic P compounds may make a significant contribution to plant available soil P particularly for soils with low fertility levels. The relatively high DOP concentrations (ca 0.227mg P L -l) found throughout the soil profile have important consequences with regards to P leaching and plant nutrition.

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Seasonal changes in Cu, Mn, Zn and Co concentrations in soil in the root‐zone of barley (Hordeum vulgare L.)

Cited by 43 publications

References 19 publications

Mobilization of cadmium and other metals from two soils by root exudates of Zea mays L., Nicotiana tabacum L. and Nicotiana rustica L.

Mobilization of cadmium and other metals from two soils by root exudates of Zea mays L., Nicotiana tabacum L. and Nicotiana rustica L.

Differential Capacity for High-Affinity Manganese Uptake Contributes to Differences between Barley Genotypes in Tolerance to Low Manganese Availability

Phosphorus fractions in soil solution: Influence of soil acidity and fertiliser additions

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