Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 72:713-716 (1983)
© 1983 American Society of Plant Biologists

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Articles

Endogenous Levels of Abscisic Acid and Decanoic Acid in Dutch Iris Bulbs and the Influence of Abscisic Acid and Decanoic Acid on Iris Meristems Cultured In Vitro1

Robert P. Doss, Yosh Kimura and James K. Christian

Horticultural Crops Research Unit, United States Department of Agriculture, Agricultural Research Service, Western Washington Research and Extension Center, Puyallup, Washington 98371, Department of Agricultural Chemistry, Washington State University, Western Washington Research and Extension Center, Puyallup, Washington 98371

Abscisic acid (ABA) and decanoic acid inhibited shoot elongation and floral development of Dutch iris (Iris hollandica Hoog. cv Ideal) meristems cultured in vitro. No synergism with respect to inhibition of leaf growth between ABA and decanoic acid was observed. With monthly harvest dates, from July 10, 1981 to October 10, 1981, there was a progressive decrease in endogenous level of free ABA in `Ideal' iris bulbs. Bulbs subjected to a full set of the usual preplanting storage conditions flowered, on average, 46 days after planting versus 194 days after planting for bulbs planted directly after harvest. ABA levels at harvest were 4- to 5-fold those after the preplanting storage treatment. In general, ABA levels did not correlate well with the length of time from planting until flowering of iris bulbs. Endogenous decanoic acid levels did not follow any pattern with respect to harvest date or postharvest treatment. After the postharvest high temperature treatment, there was about a 3-fold increase in nonscale decanoic acid concentration. Decanoic acid levels, in nonscale tissue, remained high after each of the other postharvest treatments. It is concluded that there is no good evidence to support the contention that either ABA or decanoic acid is directly involved in iris bulb dormancy.

1 Scientific Paper No. 6342, Project 0315, College of Agriculture, Research Center, Pullman, WA 99164-6240. Supported in part by a grant from the Washington State Bulb Commission. Mention of a trade name or a proprietary product does not constitute a recommendation or endorsement by the U. S. Department of Agriculture.






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