Consulta: creatorFacets:"STEFENON,VALDIR M."
Registros recuperados: 3
Data/hora: 08/06/2024 14:04:17

Ecological niche modeling of Schinus molle reveals the risk of invasive species expansion into biodiversity hotspots
Provedor de dados: 42
Autores: LEMOS,RAFAEL P.M.; MATIELO,CRISTIANE B.D.; MARQUES JR.,ALCEMIR S.; SANTOS,MICHELE G. DOS; ROSA,VANESSA G. DA; SARZI,DEISE S.; ROSA,JOÃO VITOR S..; STEFENON,VALDIR M.
Abstract: Invasive species need a closer look on the threats they may cause to the environment, mainly considering the scenario of climatic changes predicted for the next decades. Schinus molle is a pioneer tree native from South America, reported as an important invasive species in four continents. Using ecological niche modeling we show that a wide area over the world is propitious for S. molle establishment under current climatic conditions, including 14 of the 25 world’s biodiversity hotspots. Current projections of climate changes suggest scenarios implying the rise of areas favorable for S. molle expansion. Therefore, particular attention should be taken in regions where it was introduced, while approaches for long-term intervention may be necessary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Peruvian peppertree; Ecological niche modeling; Invasiveness; Ecosystem management.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700613

Histological features, starch accumulation and sprouting in the early root development of Jacaranda ulei(Bignoniaceae)
Provedor de dados: 42
Autores: SILVA,PAULO R.D. DA; STEFENON,VALDIR M.
The plant species occurring in the savanna region of the Cerrado biome in Brazil present typical morphological and physiological adaptations to a dry climate with seasonal occurrence of wildfires. In this study, the histological features of the root system, the main sites of synthesis and storage of starch and the initial phases of the bud development were characterized inJacaranda ulei. The anatomical features observed in the root system of J. ulei are related to the needs of the species to survive in the Cerrado. The histochemical analyses demonstrated high synthesis of glucose and glycoprotein after the third day of in vitro culture, in the proximal cells of the cortical parenchyma of the exoderm. Meristematic primordia were observed in the ninth day...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado Biome; Histology; Savanna; Wildfire.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100271

Ultra-low temperature conservation of Brazilian Pine embryogenic cultures
Provedor de dados: 42
Autores: DEMARCHI,GRASIELA; STEFENON,VALDIR M.; STEINER,NEUSA; VIEIRA,FELIPE N.; VESCO,LIRIO L. DAL; GUERRA,MIGUEL P.
This study aimed to establish a cryopreservation protocol for embryogenic cultures of A. angustifolia, enabling the ex situ conservation of the species. Embryogenic cultures were established from immature seeds and treated with variations of the cryoprotectant solutions SuDG, SoD and PVS2 prior to immersion in liquid nitrogen. Cell viability was evaluated after 30, 60 and 90 days of re-growth. The highest re-growth without morphological alterations and with normal biochemical composition was obtained with the PVS2 solution with 40 min immersion in ethanol (-20 °C). This procedure opens new horizons for the ex situ conservation of the species genetic.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cryopreservation; Ex situ conservation; In vitro culture; Plant germplasm conservation.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402057