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Plant and Cell Physiology, 1985, Vol. 26, No. 5 967-971
© 1985

Short Communication

A Requirement for Polyamines during the Cell Division Phase of Radicle Emergence in Seeds of Acer saccharum

Mark A. Walker1, Dane R. Roberts, Ching Yu Shih and Erwin B. Dumbroff

Department of Biology, University of Waterloo Waterloo, Ontario, Canada N2L 3G1

When stratified sugar maple seeds were germinated at 5°C, cell division did not contribute to radicle emergence or to early growth of the embryonic axis. Putrescine, spermidine and spermine contents remained low throughout stratification, but following germination their levels rose gradually for several days and then entered a phase of rapid accumulation concurrent with initiation of rapid cell division. When inhibitors of putrescine and polyamine biosynthesis were applied to newly germinated seeds, levels of the amines and cell division were markedly reduced, but cell elongation, as evidenced by growth of hypocotyls, was not affected.

1 Present address: Department of Chemistry and Biochemistry, University of Guelph, Guelph, Ontario, Canada N1G 2W1.

(Received February 25, 1985; Accepted May 10, 1985)
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