Plant Physiol.
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Plant Physiology 53:348-351 (1974)
© 1974 American Society of Plant Biologists

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Articles

Polar Transport of Kinetin in Tissues of Radish

J. W. Radin1 and R. S. Loomis

a Department of Agronomy and Range Science, University of California, Davis, California 95616

Polar transport of kinetin-8-14C occurred in segments of petioles, hypocotyls, and roots of radish (Raphanus sativus L.). The polarity was basipetal in petioles and hypocotyls and acropetal in roots. In segments excised from seedlings with fully expanded cotyledons, indole-3-acetic acid was required for polarity to develop. In hypocotyl segments isolated at this stage, basipetal and acropetal movements were equal during the first 12 hours of auxin treatment after which time acropetal movement declined. Pretreatment with auxin eliminated this delay in the appearance of polarity. In hypocotyl segments excised from seedlings with expanding cotyledons, exogenous auxin was unnecessary for polarity. Potassium cyanide abolished polarity at both stages of growth by allowing increased acropetal movement. The rate of accumulation of kinetin in receiver blocks was greater than the in vivo increase in cytokinin content of developing radish roots.

1 Present address: United States Department of Agriculture, Agricultural Research Service, Western Cotton Research Laboratory, 4135 E. Broadway, Phoenix, Arizona 85040.






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Copyright © 1974 by the American Society of Plant Biologists