Data/hora: 05/06/2024 10:06:43

Provedor de dados: | 95
País: | Brazil
Título: | Thermal and moisture content effects on storability and seed dormancy releasing on Brachiaria brizantha cultivars
Autores: | Cavalcante Filho,Francisco Nahum; Usberti,Roberto.
Data: | 2008-01-01
Ano: | 2008
Palavras-chave: | Activity of water; Seed longevity; High storage temperatures.
Resumo: | Brachiaria species normally show a double seed dormancy mechanism, mainly on fresh-harvested seeds, leading to germination percentages lower than those of viability detected by tetrazolium test (TZ) and causing problems as to storage, trading and seed inspection activities. The adoption of the methodology to detect the constants of the viability equation (high storage temperatures and fixed moisture contents) made feasible in this research to isolate the effects of 40, 50 and 65°C on B. brizantha cultivars Marandu, Mulato 1 and Mulato 2 seed dormancy releasing, after storage with moisture contents ranging from 1.9 and 17.8%. Seed samples presented high dormancy levels, detected by TZ and it was complete and partially released by chemical scarification and accelerated ageing test, respectively. No statistical differences were observed as to the speed of germination (T50); however, differences among cultivars were detected as to number of seed per gram. Sorption and desorption isotherm curves were similar for the cultivars. Seed dormancy releasing was better achieved at 40 and 50°C with mc ranging from 7.6 to 10.8%. The temperature of 50°C appears to be adequate for seed dormancy releasing in all mc analyzed. No significant seed dormancy releasing result was observed at 65°C. The cultivar Marandu presented the highest storability throughout the experiment.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222008000300013
Editor: | Associação Brasileira de Tecnologia de Sementes
Relação: | 10.1590/S0101-31222008000300013
Formato: | text/html
Fonte: | Revista Brasileira de Sementes  v.30 n.3 2008
Fonte: | info:eu-repo/semantics/openAccess