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Plant Physiology 55:948-949 (1975)
© 1975 American Society of Plant Biologists

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Articles

Abscisic Acid Stimulates Elongation of Excised Pea Root Tips

Douglas H. Gaither1, Donald H. Lutz2 and Leonard E. Forrence3

a Vegetation Control Division, Fort Detrick, Frederick, Maryland 21701

Excised Pisum sativum L. root tips were incubated in a pH 5.2 sucrose medium containing abscisic acid. Elongation growth was inhibited by 100 µM abscisic acid. However, decreasing the abscisic acid concentration caused stimulation of elongation, the maximum response (25% to 30%) occurring at 1 µM abscisic acid. Prior to two hours, stimulation of elongation by 1 µM abscisic acid was not detectable. Increased elongation did not occur in abscisic acid-treated root tips of Lens culinaris L., Phaseolus vulgaris L., or Zea mays L.

1 Present address: 4597 Knight Cove, Memphis, Tenn. 38118.

2 Present address: Wabash Valley Service Company, Ridgeway, Ill. 62979.

3 Present address: United States Department of Agriculture, Agricultural Research Service, Weed Physiology and Growth Regulator Research, Frederick, Md. 21701.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1975 by the American Society of Plant Biologists