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Rio Grande, Brazil

Martins L.,CATI | do Lago A.A.,Instituto Agronomico Of Campinas | de Andrade A.C.S.,Jardim Botanico
Revista Arvore | Year: 2012

Tabebuia impetiginosa is a tree species of high economical, ornamental and medicinal value. Its seeds present short viability period and they are difficult to be stored. Thus, the objective of this study was to study the ideal conditions of moisture water content and storage temperature for preservation of Tabebuia impetiginosa seeds for one year. Firstly, the initial moisture content of the seed was determined (18.3%) and a sample was taken. The remaining seeds were submitted to drying with air circulation at 30°C, in order to obtain seeds with the water contents of 12.5, 8.4 and 4.2%. After that, the samples were stored in chambers at -10°C and 20°C and evaluated at the beginning and after 90, 180, 270 and 360 days of storage regarding percentage of germination and seedling emergence in sand. The experiment was set up in a complete random design, in a 4 x 2 factorial design with four treatments (water contents) before storage, and eight treatments (four water content x 2 thermal conditions) in each evaluation period during storage. Means were compared by the Tukey test at 5%. The preservation of Tabebuia impetiginosa seeds is favored by maintaining them with moisture degrees ranging from 4.2 and 12.5%, at -10°C, and from 4.2 to 8.4% at 20°C. Source

Myrcia glabra (O.Berg) D. Legrand and Myrcia palustris DC. are ornamental tree species, both indicated as urban trees and used in environmental restoration. The objective of this study was to evaluate seed germination at harvest time and during storage in a cold storage for six months, by seed moisture determinations, germination and speed of germination, and seedling emergence. At harvest time M. glabra and M. palustris seeds presented germination of 88% and 97% and seedling emergence of 80% and 87%, respectively. Under storage, the seeds presented a non-significant difference in germination until 90 days and in emergence until 110 days and 120 days, respectively. After five and six months of storage M. glabra and M. palustris seeds presented 50% and 58% of initial germination rate. The cold chamber conditions preserved the seeds' initial quality in both species by, approximately, four months of storage and were appropriate for extending the seed longevity for five and six months to M. glabra and M. palustris, respectively. Source

Fior C.S.,Jardim Botanico | de Souza P.V.D.,Federal University of Rio Grande do Sul | Schwarz S.F.,Federal University of Rio Grande do Sul
Revista Arvore | Year: 2013

Butia odorata is a native palm tree from Rio Grande do Sul State, Brazil, with fruits used as food. The aim of this study was to test the emergence of seeds and diaspores under different procedures to dormancy breaking in greenhouse conditions. Scarification by opening of the embryonic cavity of the seed allowed the emergence of 72% in a mean time of 56 days. The immersion of the seeds in water for 18 h before to sowing increased the emergence but delayed the mean time to 323 days. Seeds isolated from the endocarp and not scarified presented 38% of germination in a mean time of 319 days. The emergence from diaspores submitted to 40 oC for three weeks before sowing was not significantly different to emergence from seeds isolated from endocarp, however the mean time was reduced to 206 days. The opening of the embryonic cavity resulted in higher percentage of emergency, with significant lower mean time. Source

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