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Plant and Cell Physiology, 1962, Vol. 3, No. 1 83-94
© 1962

Article

TRANSPORT OF CATIONS FROM COTYLEDON TO SEEDLING OF THE EMBRYONIC PLANTS OF VIGNA SESQUIPEDALIS1

HISASHI OKAMOTO

Biological Institute, Faculty of Science, Nagoya University Nagoya

Decrease of dry material, water, potassium and divalent cations in the cotyledon (catabolic organ and accumulation of these substances in the seedling (anabolic organ) were traced during the germination stage of Vigna sesquipedalis, cultured at 15°, 25° and 30° in the dark on the sand with the supply of tap water. One half of the divalent cations finally accumulated in the seedling came from the root, whereas most of the potassium from the cotyledon. Practically all the calcium in the cotyledon remained untransported, while 90% of K stored in the cotyledon was transported into seedling. As for divalent cations other than Ca, 50–60% of the total divalent cations was transportable. The concentration of K, transportable dry material and transportable divalent cations decreased linearly with the culture age. From the temperature dependency of the rate of this decrease, it was inferred that the transport of cations from cotyledon to seedling involved at least two component processes having activation energies of approximately 5 and 16 Kcal, respectively. The rate of transport at 30° was found to be 10–20 times greater than that calculated from the simple diffusion model in water. Fractionation of cell inclusions in the cotyledon by the use of a centrifuge (1,500 and 16,000 rpm) suggested that the amounts of ions in the precipitable fractions, being bound to certain cell components, precisely corresponded to the untransportable fraction.

1Main part of this work was reported at the Annual Meeting of the Botanical Society of Japan held at Fukuoka on Oct. 25. 1958.

(Received October 16, 1961; )
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