Consulta: creatorFacets:"Silveira,Joaquim A.G."
Registros recuperados: 3
Data/hora: 09/06/2024 17:34:14

Salinity tolerance of halophyte Atriplex nummularia L. grown under increasing NaCl levels
Provedor de dados: 91
Autores: Araújo,Sandro A.M. de; Silveira,Joaquim A.G.; Almeida,Tânia D.; Rocha,Iza M.A.; Morais,Déborah L.; Viégas,Ricardo A.
The current study reports effects of salt stress on growth, K+ nutrition and organic composition of Atriplex nummularia. The upper limit of the NaCl gradient imposed on the plants was close to seawater salinity (600 mM). An external NaCl of 150 mM improved the growth of this species, which corroborates its halophytic nature. Evidence show that Atriplex nummularia was responsive to NaCl, but the mechanisms of this response are still not known. In such stress condition, Na+ and Cl- accumulation in leaves was far greater than that in roots; therefore salinity tolerance of Atriplex nummularia is not due to ion exclusion mechanism. In spite of a reduction of K+ content of tissues under salinity conditions, no corresponding physiological relevance of this in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycophytes; Salinity stress; Ionic imbalance.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662006000400010

Desenvolvimento comparado de três cultivares de caupi, Vigna unguiculata (L.) Walp
Provedor de dados: 43
Autores: Castro,Paulo R.C.; Bergamaschi,Homero; Silveira,Joaquim A.G.; Martins,Paulo F.S.
Realizou-se determinação comparada da área foliar, da partição de biomassa e da análise de crescimento em três cultivares de Vigna unguiculata (Epace-1, Epace-6 e Epace-8) mantidos em vasos sob condições naturais. Ométodo de estabelecimento da área foliar baseado na correlação entre o peso da matéria seca foliar com o peso de discos foliares de área conhecida mostrou-se equivalente a estimativa (c.1) 1,75, referente aos folíolos terminais. O cultivar Epace-1 apresentou maior número de folhas, maiores incrementos na área foliar e maior duração de área foliar em relação aos cultivares Epace-6 e Epace-8. Vigna unguiculata mostrou uma fase exponencial inicial no acúmulo de matéria seca e uma tendência sigmoidal após a maturidade. O acúmulo de biomassa na parte...
Tipo: Info:eu-repo/semantics/article
Ano: 1984
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761984000200007

Changes in physiological indicators associated with salt tolerance in two contrasting cashew rootstocks
Provedor de dados: 61
Autores: Ferreira-Silva,Sérgio L.; Silveira,Joaquim A.G.; Voigt,Eduardo L.; Soares,Lucilene S.P.; Viégas,Ricardo A.
In order to identify salt tolerance indicators, several physiological variables were evaluated in two contrasting cashew (Anacardium occidentale L.) rootstocks in response to salt stress. The tolerant CCP 09 genotype showed better growth performance after two weeks under a large range of NaCl salinity (50, 100, 150 and 200 mM). The NaCl treatments induced a significant drop in transpiration as a consequence of an increased stomatal resistance in both genotypes. No significant differences in Na+, Cl, and K+ concentrations were found in both roots and leaves regardless of rootstocks. The tolerant genotype exhibited lower relative water content and less negative leaf osmotic potential as compared with the sensitive genotype and, therefore, these variables...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anacardium occidentale; Organic solutes; Salt stress; Salt tolerance; Sodium and chloride partitioning; Sodium-to-potassium ratio.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000100006