Untersuchungen über das Vorkommen von Plasmodesmen in den Epidermisaussenwänden

Lambertz, Peter

doi:10.1007/bf01938294

Cited by 108 publications

(21 citation statements)

References 7 publications

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“…Plants were grown as previously described to study the degree of stomatal closure as it affected the uptake and translocation of 2,4-D. The experiment was run at 30°C, relative humidity 30 % 3 % and the plants were harvested PLANT PHYSIOLOGY (17) should be given due consideration (20). The (lirect involvement of these ectodesmata in the penetration of foliarly applied herbicides or nutrients has not as yet been shown; they may function more efficiently at higher humidities in absorption phenomenion.…”

Section: Leaves Of Plants Treatedmentioning

confidence: 99%

Effects of Temperature and Humidity on Foliar Absorption and Translocation of 2,4-Dichlorophenoxyacetic Acid and Benzoic Acid

Pallas

1960

Plant Physiol.

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Little is known concerning the effect of humidity on the absorption of foliarly applied materials or their subsequent translocation. It is generally believed that the higher the humidity at any one temperature, the larger the amount of a foliarly applied material that penetrates the leaf per unit time. Most of the evidence for such an effect has been obtained indirectly. Koontz and Biddulph (16) found that the amount of phosphorus translocated from a given compound seemed to be related to the drying time of the solution on the leaf. By adding glycerine to the treatment solution, the translocation of P32 from an application of KH,PO4 solution was increased. Other workers have reported increased penetration of foliarly applied materials by additives which increase moisture retention. The recent review by Currier and Dybing (7) covers this work. It has been suggested that thin aqueous films on the leaf surface are important in promoting the absorption of nutrient sprays, the existence of the film depends upon the vapor pressure gradient at the leaf surface (4).In general, increasing temperature, within physiological limits, has been found to result in increased penetration. Rice (19) using red kidney bean plants studied the absorption of the ammonium salt of 2,4-D. He found that the amount absorbed was positively correlated with temperature over a three-level range of 46 to 580 F, 79 to 820 F and 86 to 920 F. Other workers using soybeans as the test plant found that with increasing temperature, there was an increase in the absorption of the sodium salt of 2,4-D (5,10). Barrier and Loomis (2) reported a temperature effect on the absorption of 2,4-D by soybean seedlings, but no effect upon the absorption of P32. Increased rates of absorption with increasing temperature have been reported for Co60 (9) temperature or humidity gave an increase in absorption of the maleic hydrazide. The preponderance of evidence to date indicates a maximum in translocation over the range of 20 to 300 C. At temperatures below and above this range translocation is reduced (2, 12, 22). MATERIALS AND METHODSSelected seed of Phlaseolus vulgaris L. var. Red Kidney was used. Seeds were germinated at 250 C in Vermiculite saturated with distilled water. All temperatures reported are accurate within ± 10 C and relative humidities are accurate to + 3 % as measured by a hair hygrometer calibrated periodically with a hand phychrometer. Forty to 42 hours after sowing, 90 germinated seeds with radicles between 1.5 cm and 1 cm long were selected and planted in 4 inch pots containing Yolo clay loam soil fertilized with 16 ppm N and 6 ppm P on an oven dry weight basis. After subirrigation the pots were transferred to a growth chamber where they remained at 250 C until the 5th day after sowing, when the lights were turned on at 5:30 A.M. At this time the beans were in the crook stage. Subsequent growth conditions were: 1 5Y2 hours light, temperature 250 C, relative humidity 60 to 76 % and 8/2 hours dark, temperature 15°C, relative humidity 85 to 95 %. Lig...

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Section: Leaves Of Plants Treatedmentioning

confidence: 99%

Effects of Temperature and Humidity on Foliar Absorption and Translocation of 2,4-Dichlorophenoxyacetic Acid and Benzoic Acid

Pallas

1960

Plant Physiol.

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“…Ectodesmata occur in taxonomically very different groups (LAMBERTZ 1954) and in nearly all parts of the plant (LAMBERTZ 1954, SCHNEPF 1959, STRUGGER 1957. However, they are mostly found in special parts of the plant, e.g.…”

Section: B) Ectodesmatamentioning

confidence: 99%

“…Whereas the normal form is thread-like, band-like, or cone-shaped, some more special forms such as mushroom-and pencil-like shapes may occur (FRANKE 1962). It is remarkable that the ectodesmata do not run from cellumen to cuticle, which may be explained partly by a more or less strong imbibition of the cell wall (LAMBERTZ 1954), but also seem to be dependent on the object and on external factors (SCHNEPF 1959).…”

Section: B) Ectodesmatamentioning

confidence: 99%

“…Contrary to this we find SCHNEPF'S (1959) observation that ectodesmata in electron microscopy are to be found as small bundles consisting of fine fibrils, but no differentiation in lamellas could be detected. Consequently the plasmatic origin of the ectodesmata might be doubted, the more so as plasmodesmata can be indicated with the mercury-sublimate method, at least if they occur in the sub-epidermal layer and in the anticlinal cell walls (LAMBERTZ 1954, FRANKE 1960.…”

Section: B) Ectodesmatamentioning

confidence: 99%

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Cuticula of leaves and the residue problem

Linskens

Heinen

Stoffers

1965

Residue Reviews / Rückstands-Berichte

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“…Sie unterscheiden sich dadurch von den Plasmodesmen, die als Plasmastrfinge benachbarte Protoptasten durch die Innenw~inde hindurch verbinden. Von diesen weichen die Ektodesmen weiterhin darin ab, dass mit spezifischen Nachweisverfahren, in erster Linie mit der Sublimatmethode (Schumacher, 1942;Lambertz, 1954;Schnepf, 1959), nur Ektodesmen, nicht aber Plasmodesmen sichtbar gemacht werden k6nnen, die ihrerseits besonderer Nachweismethoden bedfirfen.…”

Section: Introductionunclassified

Ektodesmenstudien. V. Mitteilung: Über das Vorkommen ektodesmenartiger Strukturen in Innenwänden

Franke¹

1970

Netherlands Journal of Plant Pathology

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Untersuchungen über das Vorkommen von Plasmodesmen in den Epidermisaussenwänden

Cited by 108 publications

References 7 publications

Effects of Temperature and Humidity on Foliar Absorption and Translocation of 2,4-Dichlorophenoxyacetic Acid and Benzoic Acid

Effects of Temperature and Humidity on Foliar Absorption and Translocation of 2,4-Dichlorophenoxyacetic Acid and Benzoic Acid

Cuticula of leaves and the residue problem

Ektodesmenstudien. V. Mitteilung: Über das Vorkommen ektodesmenartiger Strukturen in Innenwänden

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