Studies on Growth and Metabolism of Roots. VIII. Calcinm as a Growth Factor

Burström, Hans

doi:10.1111/j.1399-3054.1952.tb07534.x

Cited by 77 publications

(23 citation statements)

References 8 publications

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“…Membrane permeability may be increased if there is an insufficient supply of Ca (13,22). Calcium may be required for normal root and root hair development (17), cell multiplication and division (4), carbohydrate translocation (8), protein and nucleic acid synthesis (6,15), nitrate uptake and assimilation (11), and auxin transport (5), and may have some role in abscission (12).…”

mentioning

confidence: 99%

Effects of Calcium on the Photosynthesis of Intact Leaves and Isolated Chloroplasts of Sugar Beets

Terry¹,

Huston²

1975

Plant Physiol.

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Effects of calcium on photosynthesis in sugar beets (Beta vulgaris L. cv. F58-554H1) were studied by inducing calcium deficiency and determining changes in C02 uptake by attached leaves, electron transport, and photophosphorylation by isolated chloroplasts, and C02 assimilation by ribulose diphosphate carboxylase extracts. Calcium deficiency had no significant effect on leaf C02 uptake, photoreduction of ferricyanide, cyclic or noncyclic ATP formation of isolated chloroplasts, or on ribulose diphosphate carboxylase C02 assimilation, when the rates were expressed per unit chlorophyll. When expressed per unit leaf area C02 uptake increased by about 15% in low calcium leaves. The most noticeable effect of calcium deficiency was reduction in leaf area: low calcium had no effect on dark respiratory C02 evolution, on leaf diffusion resistance, or on mesophyll resistance to C02. We concluded that only small amounts of calcium are required for normal photosynthetic activity of sugar beet leaves.

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confidence: 99%

Effects of Calcium on the Photosynthesis of Intact Leaves and Isolated Chloroplasts of Sugar Beets

Terry¹,

Huston²

1975

Plant Physiol.

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“…In higher plants, Ca plays a key role in many cellular processes including cell division and cell enlargement (Hepler and Wayne, 1985;Kauss, 1987). Burstrom (1952) observed that Ca promotes cell enlargement rather than cell division in the root of wheat plant. In narrow tuberous root under a high Ca concentration, cell division activity may be low compared with cell elongation.…”

Section: Resultsmentioning

confidence: 99%

Effect of Calcium Concentration on the Shape of Sweet Potato (Ipomoea batatasLam.) Tuberous Root

Sulaiman

Sasaki

Shimotashiro

et al. 2004

Plant Production Science

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“…The experiments summarized in figure 2 cover undissociated acid concentrations ranging from 9.05 x 10-8 to 8.37 x 10-4, while those in figure 4 range from 5.42 x 10-6 to 1.40 x 10-4, giving an expansion of a portion of the curves of figure 2. As shown in figure 2, only the lower concentration range can be fitted significantly to the logarithm of undissociated 2,4-D concentration, with a sharp break in the curve for Chlorella and a less obvious change for navel orange leaves a"t a value corresponding to 9.50 x 10-5 M of undissociated acid.…”

Section: Fig 3 Photosynthesis and Respiration Of Washingtonmentioning

confidence: 99%

“…The concept of undissociated auxin as the controlling factor in pHgrowth curves has recently been challenged on the basis that the pH of the bathing medium controls the ionization of plant proteins and thus controls the response to added growth regulators (8). Burstr6m (9) suggests that calcium rather than undissociated auxin controls the response of root growth to pH, but he attributes this to a hardening of the cell wall by calcium, which counteracts the softening effect of auxin.…”

Section: Fig 3 Photosynthesis and Respiration Of Washingtonmentioning

confidence: 99%

Effect of 2,4-Dichlorophenoxyacetic Acid on Photosynthesis and Respiration

1954

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Early work with plant growth regulators offered only indirect evidence regarding their effect on photosynthesis. Mitchell et al. (15) showed that starved bean leaves exposed to light after they had been sprayed with a-naphthaleneacetic acid accumulated less starch, sugar, and dextrin than unsprayed leaves, and thus indicated the possibility of a decrease in photosynthesis. Freeland (13,14), measuring photosynthesis directly by gas exchange, found that 2,4-dichlorophenoxyacetic acid (2,4-D) and other plant growth regulators inhibited apparent photosynthesis in Anacharis and in bean leaves. In bean, 2,4-D in a concentration of 100 ppm caused an inhibition of photosynthesis amounting to approximately 20% over the 4-day experimental period; respiration was first inhibited and then stimulated during the same period. In Anacharis, 30 and 100 ppm of 2,4-D caused a decrease in the rate of photosynthesis, the reduction being greater at the higher concentration. Respiration was at first inhibited by 2,4-D, but showed a partial or complete recovery at the end of 48 hours. Rhodes (20) showed that 2-methyl-4-chlorophenoxyacetic acid reduced apparent photosynthesis of tomato plants.Nickell (16) reported stimulation of respiration of tumor tissue of Rumex acetosa at very low concentrations of 2,4-D, with progressive inhibition of respiration at higher concentrations. Growth of the tumor tissue responded to the application of 2,4-D in much the same manner as respiration.The dependence of the growth-promoting effect of naturally occurring auxin upon the concentration of the undissociated auxin molecule was established in 1934 (6), after Dolk and Thimann (12) had demonstrated that auxin activity was highest in an acid medium. This relationship has since been verified for synthetic plant growth regulators and other weak acids and bases by observing their effect in a variety of growth and respiration responses (2,4,5,21,22,23,25,26). Albaum et al. (1) showed that the relation of the pH of the medium to the effect of externally applied indoleacetic acid on Nitella was due to the penetration of the indoleacetic acid, the coincidence of the curves for penetration of indoleacetic acid and its dissociation, plotted against pH, indicating that it entered as the undissociated acid. 64The widespread use of 2,4-D in citrus culture for such purposes as increasing fruit size, delaying leaf and fruit abscission, and prolonging storage life of harvested fruit (24) has resulted in a situation in which a great deal of practical knowledge concerning the effects of the growth regulator on citrus is available, whereas little is known regarding the means by which 2,4-D alters the functioning of the plant to produce the observed responses. The present investigation is concerned with a quantitative study of the effect of 2,4-D on photosynthesis and respiration of citrus leaves and, for comparative purposes, its effect on the same processes in the unicellular green alga Chlorella pyrenoidosa. MATERIALS AND METHODSEXPERIMENTS WITH CITRUS LEAVES: To ...

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Studies on Growth and Metabolism of Roots. VIII. Calcinm as a Growth Factor

Cited by 77 publications

References 8 publications

Effects of Calcium on the Photosynthesis of Intact Leaves and Isolated Chloroplasts of Sugar Beets

Effects of Calcium on the Photosynthesis of Intact Leaves and Isolated Chloroplasts of Sugar Beets

Effect of Calcium Concentration on the Shape of Sweet Potato (Ipomoea batatasLam.) Tuberous Root

Effect of 2,4-Dichlorophenoxyacetic Acid on Photosynthesis and Respiration

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