Aclimatação ao estresse salino em plantas de arroz induzida pelo pré-tratamento com H2O2

Estudou-se o efeito da aplicação exógena de peróxido de hidrogênio (H2O2) na aclimatação ao estresse salino com base nas alterações fotossintéticas, indicadores de estresse oxidativo e atividade de enzimas antioxidativas em folhas de plantas de arroz. Utilizaram-se duas diferentes concentrações de H...

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Published inRevista brasileira de engenharia agrícola e ambiental Vol. 15; no. 4; pp. 416 - 423
Main Authors Carvalho, Fabricio E. L., Lobo, Ana K. M., Bonifacio, Aurenivia, Martins, Marcio O., Lima Neto, Milton C., Silveira, Joaquim A. G.
Format Journal Article
LanguagePortuguese
Published Departamento de Engenharia Agrícola - UFCG 01.04.2011
Subjects
AGRICULTURAL ENGINEERING
ENVIRONMENTAL SCIENCES
salinidade
estresse oxidativo
salinity
peróxido de hidrogênio
oxidative stress
hydrogen peroxide
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Abstract Estudou-se o efeito da aplicação exógena de peróxido de hidrogênio (H2O2) na aclimatação ao estresse salino com base nas alterações fotossintéticas, indicadores de estresse oxidativo e atividade de enzimas antioxidativas em folhas de plantas de arroz. Utilizaram-se duas diferentes concentrações de H2O2 (1 e 10 μM) para o pré-tratamento, concentrações essas aplicadas na solução nutritiva dois dias antes da indução do estresse salino (100 μM de NaCl). A limitação fotossintética e estomática resultante da exposição ao NaCl foi amenizada quando as plantas foram pré-tratadas com 1 μM de H2O2. Plantas expostas ao pré-tratamento com H2O2 e expostas ao NaCl apresentaram dano de membrana menor quando comparadas com as plantas submetidas ao NaCl isoladamente. O conteúdo de TBARS e H2O2 foi reduzido sensivelmente nas plantas pré-tratadas com 1 μM de H2O2 e expostas ao NaCl em relação às que não foram pré-tratadas. O sistema antioxidativo enzimático nas plantas expostas ao NaCl foi induzido principalmente quando ocorreu o pré-tratamento com 1 μM de H2O2. Os dados sugerem que exposição prévia ao H2O2, pode resultar numa aclimatação mais efetiva às condições de estresse salino.
AbstractList Estudou-se o efeito da aplicação exógena de peróxido de hidrogênio (H2O2) na aclimatação ao estresse salino com base nas alterações fotossintéticas, indicadores de estresse oxidativo e atividade de enzimas antioxidativas em folhas de plantas de arroz. Utilizaram-se duas diferentes concentrações de H2O2 (1 e 10 μM) para o pré-tratamento, concentrações essas aplicadas na solução nutritiva dois dias antes da indução do estresse salino (100 μM de NaCl). A limitação fotossintética e estomática resultante da exposição ao NaCl foi amenizada quando as plantas foram pré-tratadas com 1 μM de H2O2. Plantas expostas ao pré-tratamento com H2O2 e expostas ao NaCl apresentaram dano de membrana menor quando comparadas com as plantas submetidas ao NaCl isoladamente. O conteúdo de TBARS e H2O2 foi reduzido sensivelmente nas plantas pré-tratadas com 1 μM de H2O2 e expostas ao NaCl em relação às que não foram pré-tratadas. O sistema antioxidativo enzimático nas plantas expostas ao NaCl foi induzido principalmente quando ocorreu o pré-tratamento com 1 μM de H2O2. Os dados sugerem que exposição prévia ao H2O2, pode resultar numa aclimatação mais efetiva às condições de estresse salino.
Author Lima Neto, Milton C.
Carvalho, Fabricio E. L.
Silveira, Joaquim A. G.
Martins, Marcio O.
Lobo, Ana K. M.
Bonifacio, Aurenivia
AuthorAffiliation Universidade Federal do Ceará
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  fullname: Silveira, Joaquim A. G.
  organization: Universidade Federal do Ceará
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Issue 4
Keywords salinidade
estresse oxidativo
salinity
peróxido de hidrogênio
oxidative stress
hydrogen peroxide
Language Portuguese
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Snippet Estudou-se o efeito da aplicação exógena de peróxido de hidrogênio (H2O2) na aclimatação ao estresse salino com base nas alterações fotossintéticas,...
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StartPage 416
SubjectTerms AGRICULTURAL ENGINEERING
ENVIRONMENTAL SCIENCES
Title Aclimatação ao estresse salino em plantas de arroz induzida pelo pré-tratamento com H2O2
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Volume 15
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