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1

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Nitrite in the root zone and its effects on ion uptake and growth of wheat seedlings (1993)

Zsoldos, Ferenc ; Haunold, Ernst ; Vashegyi, Ágnes ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 89 (1993), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The immediate and posteffects of various concentrations of NaNO2 on ion uptake of wheat (Triticum aestivum L. cv. GK Öthalom) seedlings were studied at different pH values. Without pretreatment, the higher the concentration of NaNO2 the greater was the decrease in uptake of K+ into the roots, both at pH 4 and pH 6. At pH 6 but not at pH 4 the reverse was true when the seedlings were pretreated with NaNO2. Due to the high Na+ content of the roots, an effect of Na+ in this process cannot be excluded. Nitrite was taken up by the roots more rapidly than nitrate. Nitrite at 0.1 mM in the medium induced the development of an uptake system for both NO−2 and NO−3 in wheat roots. At higher concentrations pretreatment with NO−2 decreased NO−3 uptake by the roots, but NO3 did not inhibit the uptake of NO2. The toxic effect of NO−2 was strongly pH dependent. Lower pH of the external solution led to an increased inhibition by NO−2 of both ion uptake and growth of seedlings. The inhibitory effect of NO−2 differed considerably for roots and shoots. The roots and especially the root hairs were particularly sensitive to NO−2 treatment.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1993.tb05225.x

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2

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The effects of phosphate supply on uptake of potassium ions, 2,4-D and atrazine by wheat and maize (1986)

Zsoldos, Ferenc ; Haunold, Ernst ; Vashegyi, Ágnes

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 68 (1986), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The uptake of the auxin-type herbicide 2,4-D and of the non-auxin-type atrazine into seedlings of maize (Zea mays L.cv. SZeTC 505) and wheat (Triticum aestivum L.cv. GK Szeged) was investigated, as were their effects on the growth and K+ uptake under different nutrient conditions. A brief incubation of the roots in 0.01 mM 2,4-D caused a marked herbicide influx only in the absence of Pi. Lowering the Pi concentration of the uptake solution led to an increased 2,4-D influx into the roots, thereby inhibiting K+ uptake, growth and dry-matter production of the plants. In the case of 0.01 mM atrazine, Pi-supply in the external solution influenced neither the herbicide uptake nor the growth of the plants.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1986.tb06611.x

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3

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Effects of sulfate and nitrate on K+ uptake and growth of wheat and cucumber (1990)

Zsoldos, Ferenc ; Haunold, Ernst ; Herger, Peter ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 80 (1990), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The uptake of K+ ion was studied in the roots of wheat (Triuicum aestivum L. cv. GK Szeged) and cucumber (Cucumis sativus L. cv. Budai csemege) seedlings grown in nutrient solution under nitrogen and sulfate stress conditions. Seedlings pretreated with 1 or 10 mM NaNO3, absorbed more K+ than those treated with 0.1 mM NaNO3. However, the posteffect of NaNO3 was considerably influenced by the Na2SO4, treatment. The results suggest that, at least partly, a feed-back regulation of K+ uptake may occur. However, due to the high Na+ contents of the roots, a Na+ effect in this process cannot be excluded. The growth and dry matter yields of the roots and shoots were strongly influenced by the SO2−/4 and NO−/3 supply of the plants. Appreciable differences were experienced between wheat and cucumber seedlings. The optimum SO2−/4 concentration of the growth solution for maximal growth varied considerably between the species, and was also different for the roots and the shoots in a given species.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1990.tb00062.x

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4

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Influence of 2,4-D and low pH on potassium, ammonium and nitrate uptake by rice roots (1982)

Haunold, Ernst

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 54 (1982), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The uptake of the auxin type herbicide 2,4-D into rice seedlings (Oryza sativa L. cv. Dunghan Shali) and its effects on the K+, NH+4 and NO3 ion uptake and the K+ content were investigated at different pH values. A short incubation of the roots in 0.01 mM 2,4-D caused a marked ion uptake inhibition only at low pH. The non-auxin type herbicide benthiocarb did not produce such an inhibitory effect. Lowering of the pH in the external medium led to an increased 2,4-D uptake by the roots. These results can be explained by the increased H+ permeability of the membranes, allowing a more rapid entrance of 2,4-D into the root cells, thereby inhibiting the active ion uptake. Rice roots not subjected to 2,4-D treatment responded to H+ stress with an increased anomalous K+ uptake and a decreased K+ content. With reference to the effects of pH changes on the ion and 2,4-D uptake, possible transport mechanism of NH+4 and 2,4-D are briefly discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1982.tb00578.x

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5

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Effects of pH Changes on Ion and 2,4-D Uptake of Wheat Roots (1979)

ZSOLDOS, FERENC ; HAUNOLD, ERNST

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 47 (1979), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The quantitative relationships between pH-dependent ion and 2,4-D uptake in winter wheat seedlings (Triticum aestivum L. cv. Yubileynaya 50) have been investigated. The movement of various ions (potassium, phosphate, nitrate and ammonium) and 2,4-D across the root membranes was monitored with radioactive and stable isotope tracer methods. It was found that the H+ ion concentration of the absorption solution strongly influences the 2,4-D uptake of the roots. Simultaneously, the 2,4-D uptake stimulates secretion of H+ into the absorption solution, that is, a H+ efflux can accompany the uptake of 2,4-D. This finding is consistent with the acid secretion theory of auxin and fusicoccin action. At pH 4 the 2,4-D uptake was much higher than at pH 6, thereby inhibiting the ion uptake and increasing the phytotoxicity in the plant. The results indicate that 2,4-D enters the root cells rapidly at the lower pH, mostly as undissociated molecules. With reference to the 2,4-D concentration in the roots at pH 4, a possible transport mechanism of the auxin herbicide is briefly discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1979.tb03193.x

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