Overcoming dormancy and enhancing germination of Sphaeralcea munroana seeds

Abstract

The results of a series of experiments involving a variety of dormancy-breaking treatments indicate that Munro's globemallow [Sphaeralcea munroana (Douglas) Spach] seeds are physically dormant, possess a cap-like structure in the occlusion of the water gap, which inhibits imbibition, and can be artificially dislodged through boiling water scarification. The highest germination capacity (93%) was achieved by mechanical scarification of previously stored seeds. Exogenous application of a gibberellin solution and cold stratification failed to enhance germination compared with scarification alone, indicating an absence of additional dormancy types. These results should improve the usefulness of this drought-tolerant perennial for landscaping and restoration given its effectiveness in soil stabilization, tolerance to a variety of soil types, extreme temperatures, and ecological importance.

Keywords

Munro's globemallow, Malvaceae, germination, imbibition, water gap, gibberellic acid

Citation

Kildisheva, Olga A.; Dumroese, R. Kasten; Davis, Anthony S. 2011. Overcoming dormancy and enhancing germination of Sphaeralcea munroana seeds. HortScience. 46(12): 1672-1676.