Enhanced Germination Rates and Growth of DCPTA-treated Guayule Seed

in HortScience
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  • 1 U.S. Department of Agriculture, Agricultural Research Service, Fruit & Vegetable Chemistry Laboratory, 263 S. Chester Ave., Pasadena, CA 91106

A 26-μm DCPTA seed treatment for guayule (Parthenium argentatum Gray) was developed. We obtained a 23% increase in germination rate as measured by the coefficient of velocity (C.V.). Greenhouse seedlings grown from DCPTA-treated seeds exhibited a 22% increase in dry weight and a 95% increase in survival rate under water-limiting conditions. In field-grown guayule, multiple foliar applications of 8.2 mm DCPTA increased the total amount of rubber in roots as much as 58% without affecting the rubber content in the stems. Chemical name used: 2-Diethylaminoethyl-3,4-Dichlorophenylether (DCFTA).

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