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Following dry storage for 5 or 11 months (new and old seeds, respectively) at 5 °C, less than 10% of the seeds of Indiangrass germinated as determined by a standard germination test. We attempted to increase germination by subjecting seeds to dormancy-breaking treatments, including sodium hypochlorite soak (5.25% v/v NaOCl; 20 or 60 min), prechilling (5 °C for 2 weeks), gibberellic acid during germination (GA 3 , 1000 mg·L -1 ), and combinations thereof. Treatment with NaOCl increased the germination of non-prechilled seeds only when they were germinated in GA 3 ; a 60-min soak in NaOCl increased germination to 53% and 65% in new and old seeds, respectively. Prechilling increased germination to 65% and 47% in new and old seeds, respectively. Germination of new, prechilled seeds was increased further to 86% by either a 20-min soak in NaOCl or germination in GA 3 . Germination of old, prechilled seeds was not promoted further by treatment with NaOCl, but was increased to 67% by germination in GA 3 . Since NaOCl treatment alone failed to promote germination, we examined the effects on seedling emergence and growth of providing GA 3  at 1000 mg·L -1  during the 2-week prechilling period. While prechilling alone increased emergence to an average 34% for new and old seeds, prechilling with GA 3  increased emergence to 75% and 50% for new and old seeds, respectively. These treatments did not influence seedling shoot dry mass. Seed exposure to GA 3  during rather than after prechilling was more effective in promoting Indiangrass establishment.

Gibberellic Acid and Presowing Chilling Increase Seed Germination of Indiangrass [Sorghastrum nutans (L.) Nash.]