Similarities and differences between aluminium toxicity and phosphorus deficiency in sorghum (Sorghum bicolor) plants

Keltjens, Willem G.; Loenen, E. van

doi:10.1007/978-94-009-0585-6_66

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…Unlike Keltjens and Loenen (1990) working with sorghum in nutrient solutions where P diffusion to roots is not limited by solid phases, the present results in VR soil showed that the absorption and/or translocation of P were allowed only when Al toxicity was removed, since it was not observed higher concentrations of P in plants as a result of impaired growth in the unlimed treatments. Therefore, the data suggest that Al toxicity was the main constraint in VR soil, since P application was only effective if Al toxicity was overcome by lime.…”

Section: Plant Growth and Nutrient Element Availabilitycontrasting

confidence: 73%

Effect of liming and phosphate application on sudangrass growth and phosphorus availability in two temperate acid soils

Fernandes¹,

Coutinho

1999

Communications in Soil Science and Plant Analysis

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A pot experiment was carried out in the greenhouse with two loamy sand Dystric Cambisols derived from schist to investigate the effect of liming and phosphorus (P) application on plant growth and P availability and its assessment by four soil test methods: 0.01M calcium chloride (CaCl 2 ), cation anion exchange membrane (CAEM), Egnér-Riehm, and Olsen procedures. Soils were first incubated for two weeks with lime at four levels, depending on their content of exchangeable aluminum (Al). Phosphorus was added at two rates (75 and 150 mg P kg -1 ) and the incubation proceeded for an additional two-week period. Sudangrass (Sorghum sudanenses cv. Tama) was then planted and harvested four weeks later. During incubation and plant growth, soils were maintained at 70% of field moisture capacity. Although pH value and soil extractable P in original soils were similar, the results showed a significant difference on the effect of liming and P application. Acidity was the major limitation for DM yield in the soil with the highest amount of 855 Downloaded by [The University of Manchester Library] at 23:40 03 January 2015 856 FERNANDES AND COUTINHO exchangeable Al, while P availability was the main constraint in the other soil. Liming above pH (0.01M CaCl 2 ) 5.3-5.5 did not increase DM yield in either soil and showed a negative effect on one soil (9.7 to 6.9 and 10.2 to 7.8 g pot -1 ). Phosphorus content and uptake by sudangrass increased with liming, revealing a positive effect of lime on the availability of P to plants. Added P showed a lower efficiency in the soil with highest amounts of Al compounds. Soil tests performed after the execution of the pot experiment showed variable tendencies to predict P availability, according to the nature of the procedures and soils. Soluble-P in 0.01M CaCl 2 increased with the rise of soil pH. Extractable CAEM-P and Egnér-Riehm-P also increased with liming, but reflected the soil depletion caused by plant uptake. Extractable Olsen-P presented the most inconclusive results, suggesting the limitation of this method for acid soils which have been limed.

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Section: Plant Growth and Nutrient Element Availabilitycontrasting

confidence: 73%

Effect of liming and phosphate application on sudangrass growth and phosphorus availability in two temperate acid soils

Fernandes¹,

Coutinho

1999

Communications in Soil Science and Plant Analysis

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“…On the contrary, higher concentrations will just be the result of impaired growth. Effects of Al stress and P deficiency on nutrient uptake, proton efflux and root respiration were similar (Keltjens & Loenen, 1990). Suppressed ionic (Ca 2+ ) net uptake might be the result of the enhanced leakage of plasma membranes due to a shortage of phospholipids as induced by deficient P supply or the malfunctioning of Al-saturated phospholipids in the presence of Al 3+ .…”

Section: Resultsmentioning

confidence: 80%

Aluminium toxicity in winter wheat

Szabó

Gyimes

Véha

2015

Acta Universitatis Sapientiae, Alimentaria

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Abstract. Aluminium is the most frequent metal of the earth crust; it occurs mainly as biologically inactive, insoluble deposit. Environmental problems, industrial contaminations and acid rains increase the soil acidity, leading to the mobilization of Al. Half of the world's potential arable lands are acidic; therefore, Al-toxicity decreases crop productivity. Wheat is a staple food for 35% of the world population. The effects of Al-stress (0.1 mM) were studied on winter wheat; seedlings were grown hydroponically, at acidic pH. After two weeks, the root weight was decreased; a significant difference was found in the P-and Ca-content. The shoot weight and element content changed slightly; Al-content in the root was one magnitude higher than in the shoot, while Al-translocation was limited. The root plasma membrane H + -ATPase has central role in the uptake processes; Al-stress increased the Mg 2+ -ATPase activity of the microsomal fraction.

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