The Effect of Sodium Azide on the Exudation and Oxygen Consumption of Excised Plant Roots

Stenlid, Göran

doi:10.1111/j.1399-3054.1948.tb07123.x

Cited by 25 publications

(5 citation statements)

References 14 publications

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“…Similarly, Stenlid (1948) found that azide increased exudation from excised roots while it reduced oxygen consumption. Similarly, Stenlid (1948) found that azide increased exudation from excised roots while it reduced oxygen consumption.…”

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confidence: 88%

Influence of Upward Water Translocation on Uptake of Ions in Corn Plants

Smith

1960

American Journal of Botany

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confidence: 88%

Influence of Upward Water Translocation on Uptake of Ions in Corn Plants

Smith

1960

American Journal of Botany

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“…The control segments were placed in distilled water during the conditioning period, then transferred to distilled water plus P32, adjusted to the desired pH. The concentrations of inhibitors used were based on observations of KELLY (4), LATIES (6), and STENLID (8). Stenlid observed that sodium azide completely inhibits respiration of barley and wheat roots at pH 4.5, but produces no inhibition at pH 7.0.…”

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confidence: 99%

Effects of Respiration Inhibitors on Accumulation of Radioactive Phosphorus by Roots of Loblolly Pine

Kramer

1951

Plant Physiol.

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The close correlation between mineral nutrient accumulation and metabolic activity of roots has become well established during the past two decades (3). This correlation is based largely on observations of the effects of aeration, temperature, and carbohydrate supply of the roots on accumulation of nutrients. It would be expected that substances inhibiting root respiration would inhibit the accumulation of minerals. In one of the few studies involving the use of respiration inhibitors MACHLIS (7) reported that cyanide and azide inhibited two-thirds of the respiration of barley roots and completely inhibited accumulation of bromide ion, and there was indirect evidence that potassium accumulation was inhibited. Iodoacetate and malonic acid also inhibited both respiration and salt accumulation of barley roots. LATIES (6) likewise reported that iodoacetate, malonic acid, and fluoride inhibit respiration of barley roots, but he did not study their effects on salt accumulation.No studies of this sort have been made on roots of woody species. A series of experiments was therefore performed to find whether or not respiration inhibitors reduce mineral accumulation in loblolly pine (Pinus taeda L.) roots as they do in barley roots. An attempt was also made to learn whether or not mycorrhizal roots react in the same manner as nonmycorrhizal roots. Since mycorrhizae represent a complex structure, consisting of both root tissue and fungal hyphae, it seemed possible that they might differ physiologically from those roots which have no fungus associated with them.Experiments with respiration inhibitors Roots were obtained from potted loblolly pine seedlings growing out of doors and from seedlings growing in a clearing in the forest. The root tips and segments bearing mycorrhizae were freed of foreign matter by gently brushing with a camel's hair brush in a shallow tray of distilled water. A total of 48 segments, each at least 2 cm. in length and bearing a healthy, growing tip, were selected and separated into four groups for the comparison of the various inhibitors. Since it was impossible to find 48 root tips of the same diameter, the tips were first divided into 12 groups, each containing four roots of approximately the same dimensions. One root from each group was then used in each treatment so the various sizes of roots were uniformly distributed among the four treatments. Roots bearing mycorrhizal branches were cut into segments 1 cm. in length and selected

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“…In the present experiments, treatment with sodium azide indicated that accumulation and inward movement of ions are separate processes. Similarly, Stenlid (1948) found that azide increased exudation from excised roots while it reduced oxygen consumption. Also, Russell et al (1953) found that azide, as well as other inhibitors, might reduce accumulation in barley roots while permitting increased transfer to the shoots of the plants.…”

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confidence: 88%

Influence of Upward Water Translocation on Uptake of Ions in Corn Plants

Smith

1960

American J of Botany

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Smith, Richard C. (Rutgers U., New Brunswick, N. J.) Influence of upward water trans location on uptake of ions in corn plants. Amer. Jour. Bot. 47 (9): 724–729. Illus. 1960.—Experiments were performed in which segments of corn roots were surrounded by a nutrient solution which contained radioactive phosphorus, while a second nutrient solution containing no phosphorus was caused to flow upward through the xylem. Results indicate that phosphorus moves radially across the root into the xylem in the absence of any radial water movement, but that increased rate of water movement upward through the xylem increases the rate of radial or inward movement of ions. Results of experiments in which root segments were treated with sodium azide suggest that the movement of phosphorus across the root is independent of, and in competition with, the process of phosphorus accumulation by the cells of the cortex.

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The Effect of Sodium Azide on the Exudation and Oxygen Consumption of Excised Plant Roots

Cited by 25 publications

References 14 publications

Influence of Upward Water Translocation on Uptake of Ions in Corn Plants

Influence of Upward Water Translocation on Uptake of Ions in Corn Plants

Effects of Respiration Inhibitors on Accumulation of Radioactive Phosphorus by Roots of Loblolly Pine

Influence of Upward Water Translocation on Uptake of Ions in Corn Plants

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