Absorção de magnésio por raízes destacadas de cultivares de tomateiro

Sacramento, Luís Vitor Silva do; Martínez, Herminia; Monnerat, Pedro Henrique; Oliveira, Laede Maffia de

doi:10.1590/s0103-90161999000300001

Cited by 2 publications

(1 citation statement)

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“…Therefore, Hermans and Verbruggen (2005) and Hermans et al (2004) observed that Mg deficiency affects the export of sucrose, leading to greater accumulation of starch in the plants, which was demonstrated in a study of Sacramento et al (1999) and Boaro et al (1997), where there was a decrease in the transport of photoassimilates from the source to the drain sites, with significant decrease in yield.…”

Section: Introductionmentioning

confidence: 83%

Efficiency of Magnesium Use by Common Bean Varieties Regarding Yield, Physiological Components, and Nutritional Status of Plants

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Moraes

et al. 2015

Communications in Soil Science and Plant Analysis

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The magnesium (Mg) use efficiency in the selection of common bean (Phaseolus vulgaris L.) varieties may contribute to increased nutritional status and grain yield. Therefore, the present study aimed to assess common bean varieties following the application of Mg regarding productivity (yield), soil fertility, physiological components, and nutritional status. The experiment was conducted in a completely randomized design in a 5 × 2 factorial scheme with three replicates. Five common bean varieties [BRS Estilo, IPR Tangará, IPR Campos Gerais (CG), IAPAR 81, and BRS Ametista] supplemented with two Mg concentrations [low (0 mg kg −1 ) and high (100 mg kg −1 )] using magnesium chloride (MgCl 2 ) as a source in an Ustoxix Quatzipsamment were assessed. The yield of shoot dry weight (SDW) and grains varied significantly between varieties and Mg rates. The high Mg concentration has negatively affected the yield of SDW and grains of variety IPR Tangará, and the opposite was observed for the other varieties. The physiological components associated with photosynthesis are directly related to the yield of SDW and grains. The concentrations of phosphorus (P), calcium (Ca), sulfur (S), and boron (B) in leaves and of S, B, iron (Fe), and manganese (Mn) in grains differed among the varieties and interactions of rates and varieties for B, indicating the presence of genetic factors in nutrient uptake.

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Section: Introductionmentioning

confidence: 83%

Efficiency of Magnesium Use by Common Bean Varieties Regarding Yield, Physiological Components, and Nutritional Status of Plants

Canizella

Moreira

Moraes

et al. 2015

Communications in Soil Science and Plant Analysis

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Influência do magnésio na absorção de manganês e zinco por raízes destacadas de soja

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Malavolta

Heinrichs

et al. 2003

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a influência do Mg na absorção do Zn e do Mn em quatro cultivares de soja. Utilizou-se a técnica de cinética de absorção por raízes destacadas. As raízes foram colocadas em frascos com as seguintes combinações: três doses de Mg (1,0, 3,0 e 6,0 mmol L -1 ) x cinco doses de Zn ou Mn (0,5, 1,0, 2,0, 5,0 e 10,0 µmol L -1 ), com três repetições. Com pipetador, foi colocado 14,8 MBq de radiozinco ou de radiomanganês. Após uma hora de exposição, as raízes foram lavadas e secadas em estufa; em seguida foram pesadas e determinou-se a radioatividade. Os valores foram convertidos em micromoles por grama de matéria seca. Foram estimadas as variáveis K m e V max pela equação de Lineweaver & Burk. As cultivares apresentaram comportamentos distintos na absorção de Mg, Mn e Zn; a inibição do Mg sobre o Zn e o Mn na soja é do tipo não competitiva, e as variáveis K m e V max comportaram-se de modo independente no processo de absorção.Termos para indexação: Glycine max, nutriente, inibição, carência mineral. Magnesium influence on manganese and zinc uptake by excised roots of soybeanAbstract -The objective of this work was to evaluate the influence of Mg in the absorption of Mn and Zn in four soybean cultivars. Excised roots were used in the assays of absorption kinetics. The roots were placed in solutions with the following combinations: three concentrations of Mg (1.0, 3.0 and 6.0 mmol L -1 ) x five concentrations of Zn or Mn (0.5, 1.0, 2.0, 5.0 and 10.0 µmol L -1 ), with three replicates. To each of these solutions 14.8 MBq of radiozinc or radiomanganese was pipetted. After one hour of exposure, the roots were washed, oven-dried, weighted, and the absorbed radioactivity determined. The obtained values were converted to micromoles per gram of dry matter. The K m and V max estimated values were determined by the Lineweaver & Burk transformation. The soybean cultivars showed an effect of non-competitive inhibition between Mg and Zn and between Mg and Mn. The cultivars had distinct behavior in absorption of Mg, Mn and Zn. The K m and V max values were mutually independent in the absorption process of roots.

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Absorção de magnésio por raízes destacadas de cultivares de tomateiro

Cited by 2 publications

References 4 publications

Efficiency of Magnesium Use by Common Bean Varieties Regarding Yield, Physiological Components, and Nutritional Status of Plants

Efficiency of Magnesium Use by Common Bean Varieties Regarding Yield, Physiological Components, and Nutritional Status of Plants

Influência do magnésio na absorção de manganês e zinco por raízes destacadas de soja

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