Der Einfluß von Adsorptionsvorgängen im Xylem auf die Calcium‐Verteilung in der höheren Pflanze

Isermann, K.

doi:10.1002/jpln.19701260302

Cited by 26 publications

(7 citation statements)

References 16 publications

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“…A preference for arginine adsorption was also found for tomato wood powder by Van Bel (1978). Similar findings for calcium (Biddulph et al 1961, Isermann 1970, Ferguson and Bollard 1976 led to the conclusion that the transport of calcium proceeds by ion exchange in the xylem rather than by mass fiow. However, as Van de Geijn et al (1978) stressed, this only holds if the ions are removed at the end (the sink), and supplied at the suggestion is consistent with the observation that nitrogen entrance of the exchange column (the source).…”

Section: Discussionsupporting

confidence: 62%

Uptake and Distribution of Nitrogen in Young Apple Trees after Application of Nitrate or Ammonium, with Special Reference to Asparagine and Arginine

Tromp¹,

Ovaa²

1979

Physiologia Plantarum

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Apple rootstocks M.7 were given either nitrate or ammonium at the end of September. Until the following June, total and protein nitrogen and the composition of the soluble nitrogen fraction were followed in the roots, stem‐bark, and new growth. Nitrogen from both sources was readily absorbed in roughly the same amounts. Absorption occurred in the autumn and especially in the following spring. Incorporation of the absorbed nitrogen took place exclusively in the young roots. Arginine and, to a lower degree, asparagine were by far the most abundant of the soluble amino compounds and reached levels far above those in the unfertilized trees. The asparagine/arginine ratio was rather high during the first few weeks after fertilization but then dropped steadily to a low winter level. During May and June there was a gradual decrease to very low levels, especially in the new growth. The data suggest that the absorbed nitrogen is incorporated into asparagine and that arginine is formed from asparagine if the supply of nitrogen exceeds the immediate needs. Throughout the experimental period, ammonium fertilization led to higher values of the asparagine/arginine ratio than did nitrate nutrition. This is explained in terms of an enhanced production of asparagine and a retarded conversion into arginine. It is argued that asparagine is the main translocation compound for nitrogen. The possibility is discussed that, in addition, arginine moves upwards by a process of exchange along the negatively charged walls of the xylem vessels.

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Section: Discussionsupporting

confidence: 62%

Uptake and Distribution of Nitrogen in Young Apple Trees after Application of Nitrate or Ammonium, with Special Reference to Asparagine and Arginine

Tromp¹,

Ovaa²

1979

Physiologia Plantarum

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“…Possibly such a mechanism may explain the obtained results. Isermann (1970) combined this model with massflow regulation of Ca^' *" translocation. He proposed that the exchange process dominates at low and massflow at high transpiration rates.…”

Section: Discussionmentioning

confidence: 99%

“…They made clear by the use of the Nernst potential that the concentration differences have been passively established. Isermann (1978) demonstrated that translocation of Ca^"^ in excised shoots of beans is stimulated by DNP. However, in intact plants DNP reduces Ca^"*" translocation to a negligible level (Tab.…”

mentioning

confidence: 99%

Uptake and translocation of calcium in cucumber

Bengtsson

1982

Physiologia Plantarum

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Uptake and translocation of Ca2+(45Ca) were compared with water translocation in 12‐day old intact plants and excised roots of cucumber (Cucumis sativus L. var. Cilla), which had been cultivated in nutrient solution. No immediate reduction of Ca2+ uptake was found when water translocation was reduced by excision of the shoot. In the presence of 2,4‐dinitrophenol Ca2+ translocation was reduced in the intact plants while water translocation was unchanged. It is suggested that regulation of Ca2+ uptake is primarily achieved in the root. The DNP‐sensitive mechanism of Ca2+ uptake was associated with the root and probably represented transport through the endodermis into the stele.

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“…Der Kationenaustausch hängt von der Kapazität negativ geladener Orte in den Xylemwänden ab, Kationen, die mit dem Transpirationsstrom herangeführt werden, im Austausch gegen andere Ionen zu adsorbieren (Kationenaustauschkapazität). Van de Geijn u. Petit (1979) (Isermann 1970). Der Kationenaustausch ist um so bedeutender, je langsamer der Fluss des Wassers im Xylem und je niedriger die Ca-Konzentration ist (Mix u. Marschner 1976b).…”

Section: Triebkräfteunclassified

Die Kalziumversorgung von Äpfeln in Abhängigkeit von pflanzlichen Regelungsvorgängen

Saure

2005

Erwerbs-Obstbau

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Der Einfluß von Adsorptionsvorgängen im Xylem auf die Calcium‐Verteilung in der höheren Pflanze

Cited by 26 publications

References 16 publications

Uptake and Distribution of Nitrogen in Young Apple Trees after Application of Nitrate or Ammonium, with Special Reference to Asparagine and Arginine

Uptake and Distribution of Nitrogen in Young Apple Trees after Application of Nitrate or Ammonium, with Special Reference to Asparagine and Arginine

Uptake and translocation of calcium in cucumber

Die Kalziumversorgung von Äpfeln in Abhängigkeit von pflanzlichen Regelungsvorgängen

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