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Plant Physiology 49:155-160 (1972)
© 1972 American Society of Plant Biologists

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Articles

Cytokinins in Seedling Roots of Pea

Keith C. Short1 and John G. Torrey

a The Biological Laboratories, Harvard University, Cambridge, Massachusetts 02138

The natural occurrence of cytokinins existing both in a free form and as a constituent of transfer RNA was examined in serial segments of young seedling roots of pea. Purified ethanol extracts of root apices were resolved into four factors capable of inducing soybean callus tissue proliferation. The most active factor was identified as zeatin or some closely related compound; it produced polyploid divisions and tracheary element differentiation when tested on cultured pea root segments. The terminal 0- to 1-millimeter root tip contained 43 to 44 times more free cytokinin on a fresh weight or a per cell basis than the next 1- to 5-millimeter root segment. Extracts of more proximal segments behind the tip contained no measurable free cytokinin. Acid hydrolysates of transfer RNA exhibited reproducible cytokinin activity. Bioassays revealed that the predominant amounts of free cytokinin and that present in transfer RNA were restricted to the extreme root tip. There was approximately 27 times more free cytokinin than the amount detected in transfer RNA in root apices.

1 Present address: Department of Botany, Nottingham University, Nottingham, NG7 2RD, United Kingdom.




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[Abstract] [Full Text] [PDF]


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