Untersuchungen Über die Höhe des Wurzelwiderstandes und die Bedeutung Aktiver Wurzeltätigkeit Für die Wasserversorgung der Pflanzen

Köhnlein, Ernst

doi:10.1007/bf01911417

Cited by 34 publications

(11 citation statements)

References 8 publications

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“…RENNER (1929) showed clearly that this resistance is considerable. KOEHNLEIN (1930), KRAMER (1933) and BREWIG (1937) corroborated his observations. The most striking fact is, that this resistance is not a constant one but depends on various circumstances.…”

Section: General Introductionsupporting

confidence: 75%

“…The other possibility may be that in this case the resistance of the root tissue against the water current diminishes. KOEHNLEIN (1930) observed that at stronger suction the suction tension in the vessels was more effective but that it was not possible to get the same efficiency when the outer solution was at 0°C. He suggested, therefore, that the first possibility mentioned by j03T Was the right one.…”

Section: General Introductionmentioning

confidence: 99%

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The Regulating Influence of Transpiration and Suction Tension on the Water and Salt Uptake by the Roots of Intact Vicia Faba Plants

Brouwer

1954

Acta Botanica Neerlandica

126

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Section: General Introductionsupporting

confidence: 75%

Section: General Introductionmentioning

confidence: 99%

The Regulating Influence of Transpiration and Suction Tension on the Water and Salt Uptake by the Roots of Intact Vicia Faba Plants

Brouwer

1954

Acta Botanica Neerlandica

126

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“…The sap will flow easily back and forth in a section when it is slightly tilted. atmospheres, or even more (6,18,20,21,27,29,30,35,38 (20,30,36,38), which sometimes gave a tension of several atmospheres. As will be shown, however, these experiments did not necessarily mean that the vessels were involved.…”

mentioning

confidence: 99%

“…709 from the Woods Hole Oceanographic Institution, Woods Hole, Massachusetts. 3 Present address: The Johnson Foundation, University of Pennsylvania, Philadelphia, Pennsylvania. atmospheres, or even more (6,18,20,21,27,29,30,35,38). Various other potometer experiments have been performed on undetached branches or stems of trees and bushes (20,30,36,38), which sometimes gave a tension of several atmospheres.…”

mentioning

confidence: 99%

The Rise of Sap in Tall Grapevines.

1955

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The common northern grapevine (Vitis labrusca L.) grows rather abundantly in the wooded area around Woods Hole, Massachusetts. It frequently grows as a liana, climbing high in various trees, and attaining heights of 17 to 18 meters. In the winter the vessels of the stem and branches are filled with gas and usually contain no sap. With the warm weather in April and MIay, and before the leaves are outs the vines become full of sap which drips out from the slightest cut in the wood of stem or twigs. The vessels are so wide and so closely packed together that one can see the light through a piece of vine 2.5 cm long, and one can easily blow air through a meterlong section. The sap will flow easily back and forth in a section when it is slightly tilted. atmospheres, or even more (6,18,20,21,27,29,30,35,38 (20,30,36,38), which sometimes gave a tension of several atmospheres. As will be shown, however, these experiments did not necessarily mean that the vessels were involved. Kramer (22) found that the transpiration rate in intact tomato and sunflower plants was more than 20 times greater than the rate at which a vacuum pump could pull sap up through the stump. Bode (6) found that, when he wilted shoots of Syringa by closing the cut end with wax, the decrease in diameter of the twig and individual vessels was greater than could be effected by a vacuum pump. Crafts (10) produced a break in the sap in the intact vessels of wilted Ribes plants by lightly tapping the vessels. The ends of the broken sap columns retracted rapidly, indicating cohesion before the break, provided no air entered. A study of the injection rate of dye solutions into the vessels of various trees led Preston (32) to estimate that cohesion of up to three atmospheres may exist in at least some vessels.Arcichovskij and his collaborators (1, 2, 3) determined the concentration of sucrose which would neither gain nor lose volume when in contact with the exposed cambium. This was done by a potometer or by observing the absence of optical streaking (Schlieren). The results reflected beautifully the diurnal transpiration cycle and showed also a correlation with height. It was assumed that the osmotic pressure of the test solution equalled the sap pressure in the xylem. A birch tree had, accordingly, sap tensions as high as almost -37 atmospheres and a desert tree gave the staggering figure of -

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“…Again it is interesting to note that single excised onion roots under constant conditions will do the same without artificially applied suction during consecutive two-hour intervals. KOHNLEIN (10) and others have also applied suction to topped plants and obtained an increase in exudation; it may be that a similar increase in magnitude would have been manifested by the excised root tissue over a period of time under constant external conditions without the application of the suction pump. BREWIG (3), however, calls attention to the gradual decline of rate of exudation following excision of roots of Vicia faba; he maintains that in his experiments the role of "bleeding" can be ascertained only if measured immediately after cutting.…”

Section: Direction Of Transport In Isolated Contiguous Segmentsmentioning

confidence: 96%

Water Balance in the Onion Root: Relation of Volume Intake to Volume Exudate of Excised Roots and Isolated Root Segments

Rosene¹

1941

Plant Physiol.

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Untersuchungen Über die Höhe des Wurzelwiderstandes und die Bedeutung Aktiver Wurzeltätigkeit Für die Wasserversorgung der Pflanzen

Cited by 34 publications

References 8 publications

The Regulating Influence of Transpiration and Suction Tension on the Water and Salt Uptake by the Roots of Intact Vicia Faba Plants

The Regulating Influence of Transpiration and Suction Tension on the Water and Salt Uptake by the Roots of Intact Vicia Faba Plants

The Rise of Sap in Tall Grapevines.

Water Balance in the Onion Root: Relation of Volume Intake to Volume Exudate of Excised Roots and Isolated Root Segments

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