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Fructans and water suppression on intact and fragmented rhizophores of Vernonia herbacea BABT
Dias-Tagliacozzo,Gláucia M.; Itaya,Nair M.; Carvalho,M. Angela Machado de; Figueiredo-Ribeiro,Rita de Cássia L.; Dietrich,Sonia M. C..
In order to evaluate the involvement of fructans in drought tolerance, experiments were conducted using intact plants and excised rhizophores of Vernonia herbacea. The water content in rhizophores of intact plants was maintained for 30 days when plants were watered every 7 and 15 days, whereas plants remained alive up to 60 days without water. Total fructan, oligo- to polysaccharides ratio and mean molecular mass of polysaccharides increased in these plants indicating depolymerization of median size molecules. In apical fragments of rhizophores kept dry the oligosaccharides increased in relation to polysaccharides one day after excision in treated tissues. This was reflected in the HPLC profile of the oligosaccharides in which the proportion of free...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Inulin; Environmental stresses; Drought; Fructan metabolism; Reserve organs; Asteraceae.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000300005
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Stimulation of antioxidant system and lipid peroxidation by abiotic stresses in leaves of Momordica charantia Braz. J. Plant Physiol.
Agarwal,Sheela; Shaheen,Robina.
The purpose of the present work was to evaluate both the antioxidant response system and oxidative stress in leaves from bitter gourd (Momordica charantia L) subjected to NaCl, UV-B and water stresses at three different stages of plant growth: pre-flowering, flowering and post-flowering. Except for peroxidase (POX), all enzyme activities including superoxide dismutase (SOD), catalase (CAT), polyphenol oxidase (PPO), glutathione reductase (GR), as well as concentrations of ascorbate (ASA), hydrogen peroxide (H2O2) and thiobarbituric acid reactive substances (TBARS) exhibited maximum values at the flowering stage under all three stresses. All the enzyme activities, SOD, CAT, POX, PPO, GR and the concentrations of ASA, H2O2 and TBARS were elevated under NaCl...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidative enzymes; Environmental stresses; H2O2; Ion concentration; Thiobarbituric acid-reactive substances.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000200007
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