GERMINATION OF VERBENA SEED IN RESPONSE TO PLANT GROWTH REGULATORS

in HortScience
Authors:
Gamil A. KabbabeDepartment of Environmental Horticulture, IFAS, University of Florida, Gainesville, FL 32611

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William J. CarpenterDepartment of Environmental Horticulture, IFAS, University of Florida, Gainesville, FL 32611

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Verbena seed when harvested, has a natural dormancy that gradually dissipates during a 5 to 8 month period of dry storage. In this study, the gradual loss of the dormancy causing factor was correlated with germination percentage. Acetone treatment of verbena seeds was found to cause a slight, but non-significant, reduction in total germination. However, the infusion of gibberellic acid (GA4/7) and kinetin (KIN) with the acetone at various concentrations improved germination. The traditional method of seed osmoconditioning using Polyethylene Glycol (PEG 8000) at -1.0 MPa caused a non-significant reduction in percent germination, similar to that with acetone. When growth regulators were mixed with the osmoconditioning solution, at the concentrations used with acetone, a definite and significant improvement in terms of rate and percent of germination was observed.

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