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VÁLIO,IVANY FERRAZ MARQUES; SCARPA,FABIANO MICHELETTO. |
Seed germination of eight tropical pioneer species (Cecropia hololeuca, C. pachystachya, C. glazioui, Solanum gracillimum, S. granuloso-leprosum, S. tabacifolium, Croton floribundus and Miconia chamissois) was studied. In controlled conditions, alternating temperatures were tested from 5 to 25 °C. Low Red:Far Red ratios (R:FR) were also examined. In the field, germination was evaluated in gaps and under the canopy. With the exception of Croton floribundus, all other species were photoblastic in that higher germination percentages were found under light conditions (S. tabacifolium behaved as a negative photoblastic species at some temperatures). No relationship was found between germination percentage and alternating temperature. Germination was markedly... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pioneer species; Germination; Alternating temperatures; Gap and understory environments. |
Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000100009 |
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Saraiva,Diogo F.; Paula,Cláudio C. de; Moraes,Paulo José de; Vinícius-Silva,Ronaldo; Silva,Mariana M.; Dias,Denise C.F.S.; Botelho,Soraya A.. |
ABSTRACT Ferruginous Rocky Outcrops have high levels of species richness and endemism, but have been threatened by several anthropic actions, especially mining. Eragrostis polytricha, a common grass species in the vegetation of these outcrops, has shown promising features for use in the recovery of mining areas. However, in order to fully understand the species’ potential for such use, its requirements for germination, seed dormancy break and seedling development must be determined. Thus, we aimed to: (1) assess the temperature conditions needed for seeds of E. polytricha to germinate; (2) evaluate the effects of KNO₃ in breaking seed dormancy; and (3) analyze the germination efficiency of seeds that are still in spikelets. The experiment included seven... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alternating temperatures; Hairy sheath lovegrass; KNO₃; Mining areas; Native species. |
Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000300497 |
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