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The Effect of Light and Other Factors on Breaking the Dormancy of Guayule Seed¹

Synopsis: Exposure to light for 3 to 4 days during germination, plus the oxidation brought about by using % sodium hypochlorite, completely broke the dormancy of guayule seed so that freshly harvested achenes gave maximum germination equal to that after 84 days of storage. The effect of light and hypochlorite are additive. Age of the achene may decrease hypochlorite concentration requirement. Optimum temperatures were 30 to 20° C. Light and sodium hypochlorite did not counteract temperature variations. Light had no adverse effect on achenes which were past the dormancy stage.

² Biological Assistant, U.S. Agricultural Research Station, Salinas, Calif.; formerly Geneticist at Salinas, Calif., now Agricultural Administrator, Field Crops Research Branch, A.R.S., U.S.D.A., Beltsville, Md. The writers wish to express their appreciation for the helpful review of the manuscript by L. G. Polhamus.

Received for publication April 27, 1956.