Uptake by plants

Many estimates of total terrestrial net primary production are available, ranging between 45.5 Pg C/yr (Lieth, 1972) and 78 Pg/yr (Bazilevich et al., 1970). Ajtay ef oZ. (1979) have revised the various estimates and methods involved, they also reassess the classifications of ecosystem types and the extent of the ecosystem surface area using new data and arriving at a total NPP of 60 Pg C/yr. Gross primary production is estimated to be twice net primary production, i.e., 120 Pg C/yr. This implies that about 60 Pg C/yr are returned to the atmosphere during the respiratory phase of photosynthesis. It is well known that carbon dioxide uptake by plants follows daily cycles most plants take up CO2... 

E. Bar Ness, Y. Hadar, Y. Chen, and A. Shanzer, Iron uptake by plants from microbial siderophores—a study with 7 nitrobenz-2oxa-1,3-diazole desferrioxamine as fluorescent ferrioxamine B analog. Plant Physiol. 99 1329 (1992). 

D. T. Clarkson, Factors affecting mineral nutrient uptake by plants. Amw. Rev. Plain Physiol. 36 77 (1984). 

EPA. 1979. Plutonium-239 and americium-241 uptake by plants from soil. Las Vegas, NV Environmental Monitoring and Support Laboratory, U.S. Environmental Protection Agency. EPA600/3-79-026. PB298-241. 

Livens FR, Horrill AD, Singleton DL. 1994. The relationship between concentrations of plutonium and americium in soil interstitial waters and their uptake by plants. Sci Total Environ 155 151-159. 

Specific Chemicals. Very few studies have tested directly the Influence of specific allelochemlcals on mineral uptake by plants. 

Direct uptake by plants and microorganisms. Microbial removal of metals Biological Metals... 

Verma, K.V., George, H.V., Singh, S.K., Singh, A., Juwarkar, A., and Singh, R.N., Modeling rhizofiltration Heavy-metal uptake by plant roots, Environmental Modeling and Assessment, 11, 387-394, 2006. 

Paterson S, Mackay D (1994) A model of organic chemical uptake by plants from soil and the atmosphere. Environ Sci Technol 28 2259-2266... 

Dissolved organic molecules have many acidic functions (hydroxol and carbonic groups) to complex trace elements and their compounds to form soluble chelates. This is one of the reasons why solubility and bioavailability of trace elements in the rhizosphere are higher than bulk soils. At the same time, many organic acids also directly dissolve trace elements and their compounds in soils. Plant-produced phytosiderophores facilitate elements, such as Fe and Zn, uptake by plants (Zhang et al., 1991 Romheld, 1991 Hopkins et al., 1998). However, Shenker et al. (2001) did not find significant uptake of the Cd-phytosiderophores complex by plant roots. 

Bradford G.R., Page A.L., Lund L.J., Olmstead W. Trace element concentrations of sewage treatment plant effluents and sludges Their interactions with soils and uptake by plants. J Environ Qual 1975 4 123-127. 

Haghiri F. Cadmium uptake by plants. J Environ Qual 1973 2 93-96. 

Kumar K, Gupta SC, Baidoo SK, Chander Y, Rosen CJ (2005) Antibiotic uptake by plants from soil fertilized with animal manure. J Environ Qual 34 2082-2085... 

Marine algae transform arsenate into nonvolatile methylated arsenic compounds such as methanearsonic and dimethylarsinic acids (Tamaki and Frankenberger 1992). Freshwater algae and macrophytes, like marine algae, synthesize lipid-soluble arsenic compounds and do not produce volatile methylarsines. Terrestrial plants preferentially accumulate arsenate over arsenite by a factor of about 4. Phosphate inhibits arsenate uptake by plants, but not the reverse. The mode of toxicity of arsenate in plants is to partially block protein synthesis and interfere with protein phosphorylation — a process that is prevented by phosphate (Tamaki and Frankenberger 1992). 

The availability of selenium to plants may be lessened by modem agricultural practices, eventually contributing to selenium deficiency in animal consumers. For example, fertilizers containing nitrogen, sulfur, and phosphorus all influence selenium uptake by plants through different... 

Sources of lead in soils and uptake by plants Lower Guadiana River basin, south Portugal and Spain... 

Sulfur enters the current geochemical cycle with the weathering of rocks and conversion to either S02 or S042 -bearing species, and subsequent uptake by plants and microorganisms and conversion into a variety of organic forms. Despite the... 

Schachtman DP, Reid RJ, Ayling SM (1998) Phosphorus uptake by plants from soil to cell. Plant Physiol 116 447-453. doi http //www.plantphysiol.org Schindler DW (1974) Eutrophication and recovery in experimental lakes implications for lake management. Science 184 897-899. doi http //www.sciencemag.org/cgi/content/abstract/184/4139/897 Schindler DW, Hecky RE, Findlay DL, Stainton MP, Parker BR, Paterson MJ, Beaty KG, Lyng M, Kasian SEM (2008) Eutrophication of lakes cannot be controlled by reducing nitrogen input results of a 37-year whole-ecosystem experiment. Proc Natl Acad Sci USA 105 11254-11258. doi http //www.pnas.org/content/105/32/l 1254.abstract Scott JT, Condron LM (2003) Dynamics and availability of phosphorus in the rhizosphere of a temperate silvopastoral system. Biol Fert Soils 39 65-73 Shane MW, Lambers H (2005) Cluster roots a curiosity in context. Plant Soil 274 101-125. doi http //dx.doi.org/10.1007/s 11104-004-2725-7... 

The different metal uptake by plants is accompanied by a different involvement of these trace metals and macronutrients in the biogeochemical cycles. A comparison of... 

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