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Science 15 April 1966:
Vol. 152. no. 3720, pp. 370 - 372
DOI: 10.1126/science.152.3720.370
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Articles

Phloem Differentiation: Induced Stimulation by Gibberellic Acid

A. E. DeMaggio 1

1 Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire

Gibberellic acid solutions supplied through micropipettes to explants from dormant branches of white pine (Pinus strobus L.) stimulate changes in the cambial zone. Immature sieve cells expand radially and exhibit cytological changes usually associated with spring maturation. Diflerentiation of sieve cells continues in response to treatment and is recognized by the birefringence of secondary walls when examined with the polarizing microscope.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)