Alleviation of seed dormancy in Butia odorata palm tree using drying and moist-warm stratification
Pindo palm (Butia odorata) is a native, endangered palm species from southern Brazil. Seed dormancy limits its use and conservation. The aim of this study was to evaluate the interactive effects of incubation temperature, drying and storage of diaspores of Butia odorata on seed germination. In a first trial, diaspores were submitted to the 15 possible combinations of five temperature regimes and three drying conditions. In a second trial, the germination from diaspores that underwent the drying treatments and had been stored for 90 days was compared with that from non-stored diaspores. The greatest rate of seedling emergence was obtained when diaspores were pre-heated at 40°C for 21 days in moist sand, and then kept at a constant temperature of 30°C. Continuous temperatures of 30 and 40°C did not favour emergence. Drying periods of 24 and 48 hours reduced the initial moisture content of the diaspores and increased the speed of emergence index from 1.5 to 3.1 and 2.6, respectively. Storage did not affect germination but changed the response to the seed-drying conditions. We suggest that a dry and warm stratification requirement for the alleviation of seed dormancy could be acting in order to ensure germination and seedling establishment of B. odorata after the summer.
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Document Type: Research Article
Publication date: April 1, 2013
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