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Science 22 September 1978:
Vol. 201. no. 4361, pp. 1135 - 1138
DOI: 10.1126/science.201.4361.1135
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Articles

Abscisic Acid Induces Formation of Floating Leaves in the Heterophyllous Aquatic Angiosperm Potamogeton nodosus

LARS W. J. ANDERSON 1

1 Aquatic Weed Control Research, U.S. Department of Agriculture, Post Office Box 25007, Denver, Colorado 80225

Potamogeton nodosus tubers produce floating-type instead of submersed-type leaves when exposed to 10–5 molar synthetic abscisic acid. Abscisic acid-induced leaves have stomata on upper leaf surfaces and higher width/length ratios than controls. These effects are wholly or partially overcome by simultaneous exposure to abscisic acid combined with gibberellic acid, kinetin, or benzyladenine.

Submitted on March 30, 1978
Revised on June 14, 1978


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