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Effect of Gibberellin, Sodium Hypochlorite, Light, and Planting Depth on Germination of Guayule Seed¹

Synopsis: Both embryo and inner seedcoat dormancy of freshly harvested guayule achenes were completely broken by continuous exposure to daylight during a germination period of 3 weeks. Gibberellin substituted for light in completely breaking both embryo and inner seedcoat dormancy. Reducing the depth of immediate sand covers increased germination of untreated and hypo-chlorite-treated achenes, mainly because of light transmission through the sand. Gibberellin increased emergence of nondormant seed under a soil cover.

² Geneticist, Crops Research Division, ARS, USDA, Salinas, California. The writer wishes to express his appreciation for the helpful review of the manuscript by L. G. Polhamus.