INIBIÇÃO DA ABSORÇÃO DE MAGNÉSIO PELO POTÁSSIO EM … · attributed to the depression on...
Transcript of INIBIÇÃO DA ABSORÇÃO DE MAGNÉSIO PELO POTÁSSIO EM … · attributed to the depression on...
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INIBIÇÃO DA ABSORÇÃO DE MAGNÉSIO PELOPOTÁSSIO EM PLANTAS DE MILHO
JOSÉ ALFREDO DA FONSECA(Engenheiro Agrônomo - UFSM)
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INIBIÇÃO DA ABSORÇÃO DE MAGNÉSIO PELO POTÁSSIO EM PLANTAS DE MILHO
AUTOR: José Alfredo da Fonseca ORIENTADOR: Prof. Egon José Meurer
RESUMO
A literatura tem relatado um efeito inibitório dopotássio sobre a absorção do magnésio, ocasionando diminuiçãono rendimento das culturas e da produção animal. Foram conduzidos dois estudos em solução nutritiva com a cultura domilho, visando estudar a cinética de absorção do magnésio edo potássio e o acúmulo destes nutrientes nos tecidos. Embaixas concentrações de magnésio na solução, o potássio, emconcentrações acima da sua Cmin (5,02 x 10" moles.m-3 de K),inibiu a absorção do magnésio pelas raizes de milho, diminuindo o Imáx de 3,02 x 10-5 para 4,60 x 10-7 µmoles deMg.m-1 de raiz.s-1 e aumentando a Km de 3,68 x 10" moles.-3para um valor superior a 8,40 x 10" moles.m-3. Em altas concentrações de magnésio na solução (> 720 x 10-3 moles.m-3)o potássio não inibiu a absorção do magnésio e o Imáx chegoua 1,70 x 10-4 µmoles de Mg.m-1 de raiz.s-1. Altas concentraçõesde potássio e relações K:Mg maiores que 1:1 promoveram diminuição na translocação do magnésio da raiz à parte aéreado milho, devido a diminuição do seu influxo nas raizes. Omagnésio em qualquer concentração no meio externo não inibiuo influxo do potássio.
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INHIBITION ON MAGNESIUM UPTAKE BY POTASSIUMIN CORN PLANTS"
AUTHOR: José Alfredo da FonsecaADVISER: Prof. Egon José Meurer
SUMMARY
Decrease in plant and animal production has beenattributed to the depression on magnesium uptake by potassium. Two experiments in nutrient solution were conducted to study uptake kinetic of magnesium and potassiumand their content in corn plant tissue. When external magnesium concentration was low, potassium concentrationhigher than Cmin (5.02 x 10-3'' moles.m-3 K) depressed magnesium uptake by corn plants by decreasing the Imax from 3.02 x 10-5to 4.60 x 10-7 µmoles Mg.m-1 root.s-1; and increasing Km from 3.68 x 10-3 moles.m-3 to values higher than 8.40x 10-3 moles.m-3. When magnesium concentration in solution was higher than 720 x 10-3 moles.m-3, potassium did not depress magnesium uptake and Imax reached 1.70 x 10-4 µmoles Mg.m-1 root.s-1. High potassium concentration in external solution and K/Mg ratios higher than 1:1 depressed magnesium translocation from root to shoot, due to lower magnesium influx into corn roots. Magnesium did not affect potassium absorption by corn plants.
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