The Relationship between Transport of Individual Elements and Dry Matter from the Cotyledons of Pisum sativum L.

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Abstract
The transport of dry matter, nitrogen, potassium, phosphorus, magnesium and sodium from the cotyledons of pea seedlings was measured over a growth period of 4 weeks. A linear relationship between the export of each element and dry matter was observed throughout the experiment, and it was shown that when a certain proportion of the dry matter available for transport had been exported the same proportion of the amount of each of the elements available for transport had also moved out of the cotyledons. It is concluded that the movement of an individual solute from the cotyledons is controlled by a solute potential gradient existing between the source and sink.

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