Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 91:733-737 (1989)
© 1989 American Society of Plant Biologists

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Environmental and Stress Physiology

Kinetin Enhanced 1-Aminocyclopropane-1-Carboxylic Acid Utilization during Alleviation of High Temperatures Stress in Lettuce Seeds

Anwar A. Khan and Janusz Prusinski1

Department of Horticultural Sciences, New York State Agricultural Experiment Station, Cornell University, Geneva, New York 14456

The thermoinhibition at 35 and 32°C of pregermination ethylene production and germination in lettuce (Lactuca sativa L. cv Mesa 659) seeds was synergistically or additively alleviated by 0.05 millimolar kinetin (KIN) and 10 millimolar 1-aminocyclopropane-1-carboxylic acid (ACC). The synergistic effect of KIN + ACC on ethylene production and germination at 35°C was inhibited by Co2+ (44-46%) but not by aminoethoxyvinyl glycine (AVG). The uptake of ACC by the seed was not influenced by KIN. Upon slitting of the seed coats (composed of pericarp, testa and endosperm), following the uptake of chemicals, ACC was readily converted into ethylene at all temperatures, and the synergistic effects of KIN + ACC at 35°C were lost. At 35°C, KIN acted synergistically with ACC or ethephon (ETH) in alleviating the osmotic restraint. At 25°C, ETH was more active than KIN or KIN + ACC in overcoming the osmotic restraint. Thus, the integrity of the seed coats, the KIN-enhanced ACC utilization, and an interaction of KIN with the ethylene produced may be the basis for the synergistic or additive effects of KIN + ACC at high temperature.

1 Permanent address: Plant Cultivation Department, Technical-Agricultural University, Bydgoszcz, Poland.




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J. Argyris, P. Dahal, E. Hayashi, D. W. Still, and K. J. Bradford
Genetic Variation for Lettuce Seed Thermoinhibition Is Associated with Temperature-Sensitive Expression of Abscisic Acid, Gibberellin, and Ethylene Biosynthesis, Metabolism, and Response Genes
Plant Physiology, October 1, 2008; 148(2): 926 - 947.
[Abstract] [Full Text] [PDF]


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