Fluorescência da clorofila como uma ferramenta possível para seleção de tolerância à salinidade em girassol

Neto, André Dias de Azevedo; Pereira, Pedro Paulo Amorim; Costa, Danilo Pereira; Santos, Ana Carla Conceição dos

doi:10.1590/s1806-66902011000400010

Cited by 24 publications

(14 citation statements)

References 17 publications

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“…According to Azevedo Neto et al (2011), the F v /F m ratio has been used to detect disturbances in the photosynthetic system favored by salt stress, since its decrease indicates a reduction in the photochemical efficiency of PSII and damages to the photosynthetic apparatus. According to Bjorkman & Demming (1987), F v /F m is virtually constant for different species when measured under no-stress conditions and the photosynthetic apparatus of the plant is intact, being equal to 0.75 ≤ F v /F m ≤ 0.86.…”

Section: Resultsmentioning

confidence: 99%

“…The evaluation of F v /F 0 has also been recommended to detect changes induced by salt stress, since it amplifies the small variations detected by the F v /F m ratio (Azevedo Neto et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

“…The use of fluorescence parameters allows to analyze, qualitatively and quantitatively, the absorption and use of light energy, besides detecting possible damages in the photosynthetic apparatus of the plant (Vieira et al, 2010;Azevedo Neto et al, 2011). Non-invasive and non-destructive techniques allow the researcher to evaluate the plant during a longer period along the crop cycle and make more-consistent inferences about any hypotheses tested (Baker, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Fluorescence of chlorophyll a and photosynthetic pigments in Atriplex nummularia under abiotic stresses

Melo

Souza

Cunha

2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TChlorophyll a fluorescence is a very useful tool in ecophysiological studies to analyze the photosynthetic performance of plants under biotic and abiotic stresses. This research aimed to evaluate the parameters of the fluorescence of chlorophyll a, contents of chlorophyll a, b and total, and carotenoids in Atriplex nummularia cultivated under water stress (37 and 70% of field capacity) and salt stress (irrigation water with electrical conductivity of 0, 5, 10, 20, 30 and 40 dS m -1 ), besides two sources of salts: NaCl and a mixture of salts of Ca 2+ , Mg +2 , K + , Na + and Cl -, in a 6 x 2 x 2 factorial, with 4 replicates, totaling 96 experimental plots. At 91 days after transplanting, the initial fluorescence (F 0 ), maximum fluorescence (F m ), potential quantum efficiency of photosystem II (F v /F m ), F v /F 0 ratio and the contents of chlorophyll a, b, and total and carotenoids were determined. All assessed parameters decreased as a standard response to salt stress, except F 0 , which had, as a characteristic, the increase in its values under stress conditions. The emission parameters for Atriplex nummularia varied with the type of salt present in the irrigation water.Fluorescência da clorofila a e pigmentos fotossintéticos em Atriplex nummularia sob estresses abióticos R E S U M OA fluorescência da clorofila a é uma ferramenta de grande utilidade em estudos ecofisiológicos para a análise da performance fotossintética de plantas sob estresses bióticos e abióticos. Objetivou-se avaliar os parâmetros da fluorescência da clorofila a, teores de clorofila a, b e total e carotenoides em Atriplex nummularia cultivada sob estresses hídrico (37 e 70% da capacidade de campo) e salino (água de irrigação com condutividade elétrica de 0, 5, 10, 20, 30 e 40 dS m -1 ), além de duas fontes de sais: NaCl e uma mistura com sais de Ca 2+ , Mg 2+ , K + , Na + e Cl -, em fatorial 6 x 2 x 2 com 4 repetições totalizando 96 parcelas experimentais. Aos 91 dias após o transplantio foram determinadas a fluorescência inicial (F 0 ), a fluorescência máxima (F m ), a eficiência quântica potencial do fotossistema II (F v /F m ) e a razão F v /F 0 e os teores de clorofila a, b, total e carotenoides. Os parâmetros de emissão avaliados reduziram como resposta padrão ao estresse salino, com exceção do F 0 que tem, como característica, o aumento de seus valores quando em condições de estresse. Os parâmetros de emissão para a Atriplex nummularia variaram de acordo com o tipo de sal presente na água de irrigação. Key words:photosynthesis water and salt stress halophyte Palavras-chave: fotossíntese estresse salino e hídrico halófita

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fluorescence of chlorophyll a and photosynthetic pigments in Atriplex nummularia under abiotic stresses

Melo

Souza

Cunha

2017

Rev. bras. eng. agríc. ambient.

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“…According to Azevedo Neto et al (2011), the Fv Fm -1 ratio is an estimate of the maximum quantum efficiency of the photochemical activity of photosystem II (PS2) when all its reaction centers are open. Disturbances in this ratio are ascribed to salinity stress effects on the photosynthetic system, considering that its reduction suggests a decline in the photochemical efficiency of PS2, in addition to indicating the occurrence of disturbances and/or damage to the photosynthetic machinery in response to the inherently adverse salinity effects.…”

Section: As the Water Supply Becomes Limiting Transpiration Decreasementioning

confidence: 99%

Physiological Responses of Dwarf Coconut Plants Under Water Deficit in Salt-Affected Soils

et al. 2017

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-The objective of this study was to characterize the physiological acclimation responses of young plants of the dwarf coconut cultivar ‗Jiqui Green' associated with tolerance to conditions of multiple abiotic stresses (drought and soil salinity), acting either independently or in combination. The study was conducted under controlled conditions and evaluated the following parameters: leaf gas exchange, quantum yield of chlorophyll a fluorescence, and relative contents of total chlorophyll (SPAD index). The experiment was conducted under a randomized block experimental design, in a split plot arrangement. In the plots, plants were exposed to different levels of water stress, by imposing potential crop evapotranspiration replacement levels equivalent to 100%, 80%, 60%, 40%, and 20%, whereas in subplots, plants were exposed to different levels of soil salinity (1.72, 6.25, 25.80, and 40.70 dS m -1 ). Physiological mechanisms were effectively limited when water deficit and salinity acted separately and/or together. Compared with soil salinity, water stress was more effective in reducing the measured physiological parameters. The magnitudes of the responses of plants to water supply and salinity depended on the intensity of stress and evaluation period. The physiological acclimation responses of plants were mainly related to stomatal regulation. The coconut tree has a number of physiological adjustment mechanisms that give the species partial tolerance to drought stress and/or salt, thereby enabling it to revegetate salinated areas, provided that its water requirements are at least partially met.Keywords: Cocos nucifera L.. Water and salt stress. Physiology. RESPOSTAS FISIOLÓGICAS DE PLANTAS DE COQUEIRO ANÃO SOB DEFICIÊNCIA HÍDRICA, EM SOLOS AFETADOS POR SAISResumo -Objetivou-se, com este trabalho, caracterizar as repostas fisiológicas aclimatativas de plantas jovens de coqueiro Anão, cultivar -Verde do Jiqui‖, associadas com a sua tolerância às condições de múltiplos estresses abióticos (deficiência hídrica e salinidade do solo), atuando isolados e/ou combinados. O estudo foi realizado sob condições controladas e avaliaram-se: as trocas gasosas foliares, o rendimento quântico da fluorescência da clorofila a e os teores relativos de clorofila total (índice Spad). O experimento foi conduzido sob delineamento estatístico de blocos casualizados, no arranjo de parcelas subdivididas, sendo as parcelas constituídas por diferentes níveis de deficiência hídrica, mediante a imposição de cinco distintos percentuais de reposição das perdas de água por evapotranspiração potencial da cultura (100; 80; 60; 40 e 20%) e as subparcelas constituídas pelos crescentes níveis de salinidade do solo (1,72; 6,25; 25,80 e 40,70 dS m -1 ). Os mecanismos fisiológicos são efetivamente limitados quando a deficiência hídrica e a salinidade atuam isoladamente e/ou em conjunto. Os efeitos do estresse hídrico se mostram mais efetivos nos comprometimentos dos parâmetros fisiológicos, em detrimento à salinidade do solo. As magnitudes da...

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“…In this context, some gas exchange and chlorophyll a fluorescence studies have been used as a nondestructive method for evaluating the plant's tolerance to salinity (Silva, Ribeiro, Ferreira-Silva, Viégas, & Silveira, 2011;Azevedo Neto, Perreira, Costa, & Santos, 2011;Silva et al, 2014). These variables are of fast and non-invasive determination, which allow to monitor the development of the plant, providing qualitative and quantitative information on the physiological conditions of photosynthetic processes (Silva et al, 2011;Kalaji et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Gas exchange, Chlorophyll Fluorescence and Pigments of Noni (Morinda citrifolia L.) under Salt Stress

Cova¹,

Neto²,

Gheyi³

et al. 2018

JAS

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Noni is a fruit crop well adapted to different soil and climatic conditions. Aiming to evaluate the physiological responses to salinity, noni seedlings were grown in two levels of NaCl (0 and 100 mM) in nutrient solution and the effects of salt stress on gas exchange, chlorophyll a fluorescence, photosynthetic pigments, relative water content and membrane integrity were assessed after 1, 10, 20, 30 and 40 days of salt stress. The experimental design was a completely randomized in 2 × 5 factorial arrangement with four replications. Salinity did not affect the intrinsic efficiency of water use, but reduced net assimilation of CO 2 , stomatal conductance, transpiration, carboxylation efficiency and contents of chlorophyll a, b, and total carotenoids. Salinity caused no major changes in chlorophyll fluorescence, however the stressed plants showed a decrease in photoprotection capacity by the cycle of xanthophylls. Salinity did not affect the water status of the leaves, but damages to the integrity of the membranes were observed due to duration of salt exposure. The data indicate that noni presents stomatal closure as a mechanism of salinity tolerance, reducing water loss by transpiration and maintaining the water status.

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Fluorescência da clorofila como uma ferramenta possível para seleção de tolerância à salinidade em girassol

Cited by 24 publications

References 17 publications

Fluorescence of chlorophyll a and photosynthetic pigments in Atriplex nummularia under abiotic stresses

Fluorescence of chlorophyll a and photosynthetic pigments in Atriplex nummularia under abiotic stresses

Physiological Responses of Dwarf Coconut Plants Under Water Deficit in Salt-Affected Soils

Gas exchange, Chlorophyll Fluorescence and Pigments of Noni (Morinda citrifolia L.) under Salt Stress

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