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Overcoming dormancy in macaw palm diaspores, a tropical species with potential for use as bio-fuel

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Methods for overcoming dormancy in macaw diaspores were evaluated to determine the type of dormancy found and the best treatments for stimulating germination. The effects of pre-germinative treatments of pyrenes and seeds were evaluated in both sand and clay soil substrates under greenhouse conditions for 12 months. The emergence of seeds, with the maintenance or removal of the opercular tegument, was also evaluated in a humid growth chamber following immersion in GA3 solutions at concentrations of 0, 50, 100, 500, 1000, 2000 mg L-1. Sowing of the pyrenes into washed sand or clay soil and the seeds into clay soil under greenhouse conditions were ineffective, irrespective of the dormancy-breaking treatment used, and are not recommended for the propagation of this species. For seed sown in sand, pre-immersion of the seeds in solutions of 100, 500 and 1000 mg L-1 GA3 for 24h, immersion in water at 40°C for 24h, and the removal of the opercular tegument all favored emergence. In humid growth chambers, the removal of the opercular tegument associated with the application of GA3 at 2000 mg L-1 was the most efficient treatment. We conclude that the dormancy of macaw palm diaspores is influenced by the endocarp and that the seeds show physiological dormancy.

Document Type: Research Article

Publication date: July 1, 2011

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  • Seed Science and Technology (SST) is one of the leading international journals featuring original papers and review articles on seed quality and physiology as related to seed production, harvest, processing, sampling, storage, distribution and testing. This widely recognised journal is designed to meet the needs of researchers, advisers and all those involved in the improvement and technical control of seed quality.
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