Retention of Calcium-45 by Dogwood Trees

Thomas, William A.

doi:10.1104/pp.45.4.510

Cited by 7 publications

(2 citation statements)

References 15 publications

(21 reference statements)

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“…Whether Ca transfers can occur from tissues prior to senescence will depend on whether it is complexed or not in cell walls or even in oxalate crystals (Thomas, 1970). Thomas (1970) used 45Ca to show that internal redistribution of Ca did occur in Cornusflorida L. Calcium bound in oxalate crystals in plant tissues is also considered to be immobile (Thomas, 1970), however, this idea may need to be re-evaluated (Dahlgren et al, 1991).…”

Section: Nutrient Transfers From Roots Correlated To Distinct Soil Chmentioning

confidence: 99%

“…Thomas (1970) used 45Ca to show that internal redistribution of Ca did occur in Cornusflorida L. Calcium bound in oxalate crystals in plant tissues is also considered to be immobile (Thomas, 1970), however, this idea may need to be re-evaluated (Dahlgren et al, 1991). If the hypothesis proposed by Dahlgren et al (1991) is possible and the data in Table 2 are correct, then there may not only be a horizontal heterogeneous distribution of nutrients and roots spatially but a vertical distribution (e.g., by depth with soil horizons) that should be considered when studying ecosystems.…”

Section: Nutrient Transfers From Roots Correlated To Distinct Soil Chmentioning

confidence: 99%

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Roots, nutrients and their relationship to spatial patterns

Vogt

Asbjornsen

et al. 1995

Plant Soil

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Ecosystem sustainability and resilience after a disturbance may be regulated by processes occurring at smaller spatial scales. The matrix of different spatial environments are created by (1) individual plants that accumulate higher concentrations of specific nutrients, trace elements or defensive plant secondary chemicals and thereby modify the chemistry of their ecological space and/or rates of processes, (2) the presence of structures (e.g., coarse woody debris) that may buffer some micro-environments from disturbances by functioning as a hospitable environment or as a reservoir for mycorrhizal fungi to sustain them into the next phase of stand development, and (3) chemical changes in soils during soil development which may result in distinct soil chemical environments. The response of the plants or change in the sustainability of carbon and nutrient cycles may be expressed more strongly at this smaller ecological space of an individual plant and furthermore must be frequently examined separately by the above-and belowground space of that individual. This paper will present three case studies from temperate and tropical forest ecosystems which suggest the importance of studying plant growth and nutrient and trace element cycling by stratifying sampling to encompass the mosaic patterns of existing spatial variability within the ecosystem. The examples show how individual plant species are able to create ecologically distinct spatial environments because of their distribution patterns within the landscape, how nutrient transfers in roots respond to the chemical variations in the soil, and how roots and mycorrhizal fungi are able to maintain themselves in the mosaic of coarse woody debris remaining on a site after the elimination of aboveground tree biomass.

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Section: Nutrient Transfers From Roots Correlated To Distinct Soil Chmentioning

confidence: 99%

Section: Nutrient Transfers From Roots Correlated To Distinct Soil Chmentioning

confidence: 99%

Roots, nutrients and their relationship to spatial patterns

Vogt

Asbjornsen

et al. 1995

Plant Soil

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Investigations on Secondary Translocation of Root Absorbed ⁴⁵ Ca in Bean Plants

Wieneke¹

1973

J Plant Nutrition & Soil

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Einfluß von Chelatoren auf die Calcium‐Verlagerung im Sproß höherer Pflanzen

Isermann

1978

J Plant Nutrition & Soil

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Influence of chelating agents on calcium translocation in the shoots of higher plants Using 28‐day‐old plants and shoots of bush beans as well as isolated haulms of barley taken from the field 24‐hour experiments were carried out to investigate how equimolar additions of the chelating agents Na2H2 EDTA (EDTA) or citric acid to the 45CaCl2 uptake solution (0.5–1.0 mM/l) influenced Ca‐translocation in the shoot. The following results were obtained: If Ca2+ was taken up by the intact root system, equimolar additions of EDTA to the CaCl2‐uptake solution reduced Ca‐uptake, and therefore the translocation of Ca to and within the shoot was also lowered. Chelating agents favoured Ca‐translocation in the shoots only when Ca‐uptake as a chelate by the plasmalemma of the root cells was prevented using DNP or when the roots were by‐passed by injecting chelates or by removing the roots themselves. Additions of MgCl2 (0.5 mM/l) or DNP (10−5‐10−4 M/l) to the 45CaCl2 uptake solution (0.5 mM/l) of isolated shoots reduced the favourable effect of equimolar EDTA‐levels on Ca‐translocation because Mg2+ and DNP themselves increased Ca‐translocation. From the effects of Mg2+ and DNP it was concluded that the favourable influence of chelating agents on Ca‐translocation within the shoot can be explained on the one hand by the reduction in adsorption of Ca2+ on negatively charged cell walls of the xylem and on the other hand by the diminished accumulation and precipitation of Ca in the xylem‐surrounding tissue. On the basis of the results obtained here, stem injections of chelating agents or treatments which influence the content of native chelating agents in the plants appear to be possible starting points for the improvement of Ca‐translocation within the shoot.

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Retention of Calcium-45 by Dogwood Trees

Cited by 7 publications

References 15 publications

Roots, nutrients and their relationship to spatial patterns

Roots, nutrients and their relationship to spatial patterns

Investigations on Secondary Translocation of Root Absorbed ⁴⁵ Ca in Bean Plants

Einfluß von Chelatoren auf die Calcium‐Verlagerung im Sproß höherer Pflanzen

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Retention of Calcium-45 by Dogwood Trees

Cited by 7 publications

References 15 publications

Roots, nutrients and their relationship to spatial patterns

Roots, nutrients and their relationship to spatial patterns

Investigations on Secondary Translocation of Root Absorbed 45 Ca in Bean Plants

Einfluß von Chelatoren auf die Calcium‐Verlagerung im Sproß höherer Pflanzen

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Investigations on Secondary Translocation of Root Absorbed ⁴⁵ Ca in Bean Plants