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Untersuchungen mit der Röntgen-Mikrosonde über Verteilung und Transport von Ionen in Pflanzengeweben

II. Ionentransport nach den Früchten von Pisum sativum

Investigations on the distribution and transport of ions in plant tissues with the electron probe X-ray micronalyser

II. Long-distance transport of ions to pea fruits

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Summary

Translocation and distribution of K, Ca, Sr and P in the fruit stalk and pods of Pisum sativum were studied by means of the electron probe X-ray micronalyser.

Long-distance transport through the fruit stalk of K and P as well as of Ca and Sr takes mainly place in sieve tubes. Therefore the theory of Münch (1930) concerning the supply of substances via the phloem to seeds of weakly transpiring fruits is confirmed for several important ions. A fairly small Ca supply to the sieve tubes seems to be the reason that the transport of Ca in sieve tubes and its content in seeds are relatively low. Ca and Sr are also translocated in xylem vessels, mainly to the dorsal suture of the pods; there they accumulate as sulfate in the xylem tissues of the central vein.

In addition to the longitudinal translocation there is also a lateral transport outwards from the conducting tissues. The heaviest depositions of minerals are located in the cell walls of sclerenchyma outside of the vascular bundles. These depositions consist mainly of Ca-Sr-phosphate in the fruit stalk and the dorsal suture and of Ca-Sr-sulfate as well as K-phosphate in the ventral suture. The cortical cells of the fruit stalk contain some crystals of Ca-Sr-oxalate.

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Läuchli, A. Untersuchungen mit der Röntgen-Mikrosonde über Verteilung und Transport von Ionen in Pflanzengeweben. Planta 83, 137–149 (1968). https://doi.org/10.1007/BF00385018

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  • DOI: https://doi.org/10.1007/BF00385018

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