Plant Physiol.
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Plant Physiology 56:263-266 (1975)
© 1975 American Society of Plant Biologists

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Articles

Additive and Synergistic Effects of Kinetin and Ethrel on Germination, Thermodormany, and Polyribosome Formation in Lettuce Seeds 1,2

V. Sivaji Rao, Narendra Sankhla3 and Anwar A. Khan

a New York State Agricultural Experiment Station, Cornell University, Geneva, New York 14456

The inhibition of germination of Grand Rapids lettuce (Lactuca sativa L.) seeds at 35 C was removed to a marked extent by kinetin and 2-chloroethylphosphonic acid (ethrel). When both compounds were used together, an additive effect was observed. A synergistic effect was, however, noted when ethrel promoted the kinetin reversal of abscisic acid inhibition of seed germination (light- as well as gibberellic acid-, induced). Both kinetin and ethrel increased the total ribosomal material and the percentage of polyribosomes in lettuce seeds imbibed in the light for 24 hours. A combination of the two compounds showed a synergism in polyribosome formation only at high ethrel concentration. The inability of ethrel to reverse abscisic acid inhibition indicates that kinetin action cannot always be substituted by ethrel. The possible mechanisms involved in the enhanced response by a combination of kinetin and ethrel are discussed.

3 Present address: Department of Botany, University of Jodhpur, Jodhpur, Rajastan, India.

1 This investigation was supported in part by grants from the Herman Frasch Foundation and the American Seed Research Foundation to A.A.K.

2 Approved by the director of the New York State Agricultural Experiment Station as Journal Series Paper No. 2170.






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Copyright © 1975 by the American Society of Plant Biologists