Atividade de enzimas antioxidantes e inibição do crescimento radicular de feijão caupi sob diferentes níveis de salinidade

Maia, Josemir Moura; Ferreira‐Silva, Sérgio Luiz; Voigt, Eduardo Luiz; Macêdo, Cristiane Elizabeth Costa de; Ponte, Luiz Ferreira Aguiar; Silveira, Joaquim Albenísio Gomes da

doi:10.1590/s0102-33062012000200010

Cited by 39 publications

(31 citation statements)

References 40 publications

(45 reference statements)

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“…The results obtained in the present study corroborate those found in cowpea grown under saline conditions, in response to increased POD activity (Maia et al 2012). Previous results from hypocotyls of corn seedlings also indicate that proteins were protected by increased CAT activity (Rosa et al 2005).…”

Section: Resultssupporting

confidence: 91%

Azospirillum brasilense affects the antioxidant activity and leaf pigment content of Urochloa ruziziensis under water stress

Bulegon

Guimarães

Laureth

2016

Pesqui. Agropecu. Trop.

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Water stress leads to the formation of reactive oxygen species, resulting in degradation of leaf pigments and cell death. This study aimed at assessing the oxidative enzyme activity and photosynthetic pigment content in seeds and/or leaves of Urochloa ruziziensis (syn. Brachiaria) inoculated with Azospirillum brasilense under water stress. Assessments of soluble proteins, chlorophylls a and b and carotenoid contents, as well as the activity of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) enzymes, were conducted at the beginning of the water stress process and also under severe water stress and during plant rehydration. Seed inoculation showed a reduction in the action of SOD, under water stress, with an increase after rehydration. POD exhibited an activity greater than CAT in all the assessments, but it did not differ statistically under severe water stress. CAT activity increased under severe stress in all treatments, particularly for leaf inoculation. Chlorophyll a was slightly degraded, maintaining the levels of the irrigated control, while the chlorophyll b and carotenoid contents, in plants subjected to leaf inoculation with A. brasilense, were higher under water stress. It was concluded that the leaf inoculation of U. ruziziensis with A. brasilense makes the plant more efficient at removing reactive oxygen species and protecting chlorophyll a.

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Section: Resultssupporting

confidence: 91%

Azospirillum brasilense affects the antioxidant activity and leaf pigment content of Urochloa ruziziensis under water stress

Bulegon

Guimarães

Laureth

2016

Pesqui. Agropecu. Trop.

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“…A redução no crescimento das plântulas de guandu pelo aumento da salinidade foi expressivo, mesmo com o incremento observado nos teores de prolina, na parte aérea e nas raízes. A redução do potencial hídrico, induzida pelo PEG ou pelo sal, bem como os efeitos citotóxicos dos íons Na + e Cl -, no caso da salinidade, são responsáveis pela redução no crescimento das plântulas (Gordin et al, 2012;Maia et al, 2012).…”

Section: Resultsunclassified

Crescimento e conteúdo de prolina em plântulas de guandu submetidas a estresse osmótico e à putrescina exógena

Monteiro¹,

Cruz

Nardin

et al. 2014

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi verificar o efeito da aplicação da poliamina putrescina no acúmulo de prolina e no crescimento inicial de plântulas de guandu cultivadas sob estresse hídrico ou salino, e avaliar se esta poliamina pode ser usada como atenuadora desses estresses. Sementes de duas cultivares de guandu, BRS Mandarim e Caqui, foram germinadas em caixas gerbox forradas com papel de filtro umedecido com 0,0, -0,2, -0,3, -0,4, -0,5 MPa de PEG 6000 ou 0, 20, 40, 60, 80 e 120 mmol L -1 de NaCl, na ausência (0 mmol L -1 ) ou na presença (0,5 mmol L -1 ) de putrescina. Utilizou-se o delineamento inteiramente casualizado, em arranjo fatorial 2x5x2 e 2x6x2 (duas cultivares, cinco níveis de deficiência hídrica ou seis níveis de estresse salino, e presença ou ausência de putrescina), com quatro repetições. O crescimento das plântulas é acentuadamente reduzido pelas condições de restrição hídrica e salinidade. A putrescina exógena incrementa, sob ambos os estresses, os teores de prolina nas plântulas de guandu, especialmente na cultivar BRS Mandarin, e atenua os efeitos da deficiência hídrica moderada nas cultivares estudadas. Os estresses de restrição hídrica e de salinidade causam acúmulo de prolina na parte aérea e nas raízes de ambas as cultivares. A prolina pode ser considerada um bom indicador bioquímico e fisiológico desses estresses em plântulas de guandu.Termos para indexação: Cajanus cajan, indicador bioquímico, poliamina, restrição hídrica, salinidade, solutos compatíveis.Growth and proline content in pigeon pea seedlings subjected to osmotic stress and to exogenous putrescine Abstract -The objective of this work was to verify the effect of the application of the polyamine putrescine on the accumulation of proline and on the early seedling growth of pigeon pea subjected to water or salt stress, and to evaluate whether this polyamine can be used to alleviate these stresses. Seeds of two cultivars of pigeon pea, BRS Mandarim and Caqui, were germinated in gerbox boxes lined with filter papers soaked with 0.0, -0.2, -0.3, -0.4, -0.5 MPa PEG 6000 or 0, 20, 40, 60, 80, and 120 mmol L -1 NaCl, in the absence (0 mmol L -1 ) or presence (0.5 mmol L -1 ) of putrescine. A completely randomized design was used, in a 2x5x2 and 2x6x2 factorial arrangement (two cultivars, five levels of drought or six levels of salt stress, and presence or absence of putrescine), with four replicates. Seedling growth is highly reduced by water restriction and salinity conditions. Exogenous putrescine increases, under both stresses, the proline contents in pigeon pea seedlings, especially in the cultivar BRS Mandarin, and alleviates the effects of moderate water deficiency on the studied cultivars. Water restriction and salinity stresses cause accumulation of proline content in shoots and roots of both cultivars. Proline can be considered a good biochemical and physiological indicator of these stresses in pigeon pea seedlings.Index terms: Cajanus cajan, biochemical indicator, polyamine, water restriction, salinity, compatible so...

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“…A redução do potencial hídrico, induzida pelo sal, bem como, os efeitos citotóxicos dos íons Na + e Cl -são responsáveis pela redução na fitomassa e na densidade radicular das plântulas (Gordin et al, 2012;Maia et al, 2012). Esta informação é ratificada por Monteiro et al (2014) ao relatarem que em situações de toxidez por Na + e Cl -, a degradação de compostos celulares e a síntese de metabólitos indesejáveis podem promover redução drástica do crescimento.…”

Section: Summary Of Analysis Of Variance and Tukey Tests The Levels Ounclassified

Crescimento radicular e pigmentos clorofilianos em duas forrageiras submetidas a níveis crescentes de NaCl

Rhein¹,

Cruz²,

Ferraz³

et al. 2015

Científica

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Atividade de enzimas antioxidantes e inibição do crescimento radicular de feijão caupi sob diferentes níveis de salinidade

Cited by 39 publications

References 40 publications

Azospirillum brasilense affects the antioxidant activity and leaf pigment content of Urochloa ruziziensis under water stress

Azospirillum brasilense affects the antioxidant activity and leaf pigment content of Urochloa ruziziensis under water stress

Crescimento e conteúdo de prolina em plântulas de guandu submetidas a estresse osmótico e à putrescina exógena

Crescimento radicular e pigmentos clorofilianos em duas forrageiras submetidas a níveis crescentes de NaCl

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