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| Bicalho,Elisa Monteze; Soares-da-Mota,Letícia A.; Garcia,Queila Souza. |
| ABSTRACT Germination is the first step to successful plant establishment. The range of factors that promote germination varies among species. Light and temperature requirements for the germination of species of Velloziaceae were investigated. Seeds of Barbacenia flava, B. markgrafii, B. purpurea, B. williamsi, Vellozia alata, V. compacta, V. glochidea and V. plicata were collected from rocky outcrops located in different Brazilian states and were incubated for germination at 10 to 40 °C in light or dark conditions. Seed mass and length were measured for each species. In general, all species exhibited a high germination percentage at temperatures of 15-40 °C in the light, with the optimal temperature being 25-30 °C for species of Barbacenia and 30 °C for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Barbacenia; Darkness; Granitic outcrops; Inselbergs; Ironstone outcrops; Optimal temperature; Quarzitic outcrops; Vellozia. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000200240 |
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| Castro,Jordana Luísa de; Souza,Mariana Gonçalves; Rufini,Márcia; Guimarães,Amanda Azarias; Rodrigues,Tainara Louzada; Moreira,Fatima Maria de Souza. |
| ABSTRACT Mining is an important economic activity. However, its impact on environment must be accessed, mainly on relevant processes for their sustainability. The objective of this study was to evaluate the diversity and efficiency of symbiotic nitrogen fixing bacterial communities in soils under different types of vegetation in the Quadrilátero Ferrífero: ironstone outcrops, Atlantic Forest, neotropical savanna, and a rehabilitated area revegetated with grass. Suspensions of soil samples collected under each type of vegetation were made in a saline solution to capture rhizobia communities that were then inoculated on cowpea [Vigna unguiculata (L.) Walp.], which was used as a trap plant. The symbiotic efficiency of the communities was evaluated in a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological indicators; Biological N2 fixation; Ironstone outcrops. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100421 |
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