Phosphate forms in plant and their internal buffering in five soybean cultivars
Differences among plants in their ability to support nutritional stress periods may be caused by a differential vacuole capacity of ion storage and release and may also depend on the intensity of nutrient re-translocation under such conditions. In five soybean cultivars, submitted to eight days of P deprivation, the dry matter production and the contents of three phosphorus (P) forms - inorganic (Pi), organic (Po), and acid-soluble total (Pts) of different plant organs were determined. Pi release velocity (RSPi) was estimated as the tangent to the equations obtained for Pi f(t) at the point t = 2 days (the mean point in the period of greatest Pi decrease), considering that -deltaPi/deltat expresses the rate of Pi release. The internal Pi buffering capacity (IBCPi) was calculated as the inverse of the RSPi. Cultivars' differences in size of the non-metabolic Pi pool, RSPi, and the ability to transport Pi from less to more actively metabolizing regions were evaluated. The preferential Pi source and sink compartments under limited P absorption conditions were also evaluated. The cultivar Santa Rosa showed the highest Pi storage ability when the external supply was high, and a more intensive release under low P supply conditions than IAC8 and UFV1. The cultivar Uberaba was superior to Doko in its ability to store and use Pi. In all cultivars, upper leaves and roots were the main sink of Pi stored in the middle and lower leaves. Roots and upper leaves showed larger RSPi and lower IBCPi values than middle and lower leaves.
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Sociedade Brasileira de Ciência do Solo
2005
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oai:scielo:S0100-068320050002000102005-06-30Phosphate forms in plant and their internal buffering in five soybean cultivarsMartinez,Hermínia Emília PrietoNovais,Roberto FerreiraRodrigues,Luciana AparecidaSacramento,Luis Vitor Silva do phosphorus phosphate fractions phosphorus deprivation nutritional stress Differences among plants in their ability to support nutritional stress periods may be caused by a differential vacuole capacity of ion storage and release and may also depend on the intensity of nutrient re-translocation under such conditions. In five soybean cultivars, submitted to eight days of P deprivation, the dry matter production and the contents of three phosphorus (P) forms - inorganic (Pi), organic (Po), and acid-soluble total (Pts) of different plant organs were determined. Pi release velocity (RSPi) was estimated as the tangent to the equations obtained for Pi f(t) at the point t = 2 days (the mean point in the period of greatest Pi decrease), considering that -deltaPi/deltat expresses the rate of Pi release. The internal Pi buffering capacity (IBCPi) was calculated as the inverse of the RSPi. Cultivars' differences in size of the non-metabolic Pi pool, RSPi, and the ability to transport Pi from less to more actively metabolizing regions were evaluated. The preferential Pi source and sink compartments under limited P absorption conditions were also evaluated. The cultivar Santa Rosa showed the highest Pi storage ability when the external supply was high, and a more intensive release under low P supply conditions than IAC8 and UFV1. The cultivar Uberaba was superior to Doko in its ability to store and use Pi. In all cultivars, upper leaves and roots were the main sink of Pi stored in the middle and lower leaves. Roots and upper leaves showed larger RSPi and lower IBCPi values than middle and lower leaves.info:eu-repo/semantics/openAccessSociedade Brasileira de Ciência do SoloRevista Brasileira de Ciência do Solo v.29 n.2 20052005-04-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832005000200010en10.1590/S0100-06832005000200010 |
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Martinez,Hermínia Emília Prieto Novais,Roberto Ferreira Rodrigues,Luciana Aparecida Sacramento,Luis Vitor Silva do |
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Martinez,Hermínia Emília Prieto Novais,Roberto Ferreira Rodrigues,Luciana Aparecida Sacramento,Luis Vitor Silva do Phosphate forms in plant and their internal buffering in five soybean cultivars |
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Martinez,Hermínia Emília Prieto Novais,Roberto Ferreira Rodrigues,Luciana Aparecida Sacramento,Luis Vitor Silva do |
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Martinez,Hermínia Emília Prieto |
title |
Phosphate forms in plant and their internal buffering in five soybean cultivars |
title_short |
Phosphate forms in plant and their internal buffering in five soybean cultivars |
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Phosphate forms in plant and their internal buffering in five soybean cultivars |
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Phosphate forms in plant and their internal buffering in five soybean cultivars |
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Phosphate forms in plant and their internal buffering in five soybean cultivars |
title_sort |
phosphate forms in plant and their internal buffering in five soybean cultivars |
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Differences among plants in their ability to support nutritional stress periods may be caused by a differential vacuole capacity of ion storage and release and may also depend on the intensity of nutrient re-translocation under such conditions. In five soybean cultivars, submitted to eight days of P deprivation, the dry matter production and the contents of three phosphorus (P) forms - inorganic (Pi), organic (Po), and acid-soluble total (Pts) of different plant organs were determined. Pi release velocity (RSPi) was estimated as the tangent to the equations obtained for Pi f(t) at the point t = 2 days (the mean point in the period of greatest Pi decrease), considering that -deltaPi/deltat expresses the rate of Pi release. The internal Pi buffering capacity (IBCPi) was calculated as the inverse of the RSPi. Cultivars' differences in size of the non-metabolic Pi pool, RSPi, and the ability to transport Pi from less to more actively metabolizing regions were evaluated. The preferential Pi source and sink compartments under limited P absorption conditions were also evaluated. The cultivar Santa Rosa showed the highest Pi storage ability when the external supply was high, and a more intensive release under low P supply conditions than IAC8 and UFV1. The cultivar Uberaba was superior to Doko in its ability to store and use Pi. In all cultivars, upper leaves and roots were the main sink of Pi stored in the middle and lower leaves. Roots and upper leaves showed larger RSPi and lower IBCPi values than middle and lower leaves. |
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Sociedade Brasileira de Ciência do Solo |
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2005 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832005000200010 |
work_keys_str_mv |
AT martinezherminiaemiliaprieto phosphateformsinplantandtheirinternalbufferinginfivesoybeancultivars AT novaisrobertoferreira phosphateformsinplantandtheirinternalbufferinginfivesoybeancultivars AT rodrigueslucianaaparecida phosphateformsinplantandtheirinternalbufferinginfivesoybeancultivars AT sacramentoluisvitorsilvado phosphateformsinplantandtheirinternalbufferinginfivesoybeancultivars |
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