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© 1972 Oxford University Press

RESEARCH-ARTICLE

Transport of Materials from the Cotyledons during Germination of Seeds of the Garden Pea (Pisum sativum L.)

J. L. GUARDIOLA 1 and J. F. SUTCLIFFE

School of Biological Sciences, University of Sussex Falmer, Brighton

After the first week of germination the relationship between the amounts of total dry matter, nitrogen, phosphorus, sulphur, and potassium transferred to the axis from the cotyledons in the intact plant remained approximately constant irrespective of the conditions of growth. It is proposed that the ratio in which the individual elements are transported is determined by the proportions in which they are released by the storage cells. Deviation from this ratio during the first week of germination, and over a longer period in deshooted plants is attributed to competition for the available nutrients between actively metabolizing cells in the cotyledons and axis.

It is demonstrated by steam-girdling that movement of materials from the cotyledons into the shoot probably occurs via the phloem. Calcium is mobile in the phloem during the early stages of germination, possibly because the amount of free calcium in the cotyledons is high.


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