Determination of the quantum efficiency of photosystem II and of non-photochemical quenching of chlorophyll fluorescence in the field

Bilger, Wolfgang; Schreiber, Ulrich; Bock, Michael

doi:10.1007/bf00341354

Cited by 440 publications

(312 citation statements)

References 26 publications

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“…The efficiency of light reactions of photosynthesis was measured on single leaves using the miniaturized Fluorescence Yield Analyser (Mini-PAM) (H. Walz, Effeltrich, Germany) with a leaf clip holder described in Bilger et al [21]. Measurements were conducted on 45 plants per treatment (15 leaves from fifteen different plants in each plot, n = 360).…”

Section: Field Datamentioning

confidence: 99%

Discriminating Irrigated and Rainfed Maize with Diurnal Fluorescence and Canopy Temperature Airborne Maps

Rossini

Panigada

Cilia

et al. 2015

IJGI

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This study evaluates the potential of airborne remote sensing images to detect water stress in maize. Visible and near infrared CASI (Itres Research Ltd., Calgary, AL, Canada) and thermal AHS-160 (Sensytech Inc., Beverly, MA, USA) data were acquired at three different times during the day on a maize field (Zea mays L.) grown with three different irrigation treatments. An intensive field campaign was also conducted concurrently with image acquisition to measure leaf ecophysiological parameters and the leaf area index. The analysis of the field data showed that maize plants were experiencing moderate to severe water stress in rainfed plots and a weaker stress condition in the plots with a water deficit imposed between stem elongation and flowering. Vegetation indices including the normalized difference vegetation index (NDVI) and the photochemical reflectance index (PRI) computed from the CASI images, sun-induced chlorophyll fluorescence (F760) and canopy temperature (Tc) showed different performances in describing the water stress during the day. During the OPEN ACCESS ISPRS Int. J. Geo-Inf. 2015, 4 627 morning overpass, NDVI was the index with the highest discriminant power due to the sensitivity of NDVI to maize canopy structure, affected by the water irrigation treatment. As the day progressed, processes related to heat dissipation through plant transpiration became more and more important and at midday Tc showed the best performances. Furthermore, Tc retrieved from the midday image was the only index able to distinguish all the three classes of water status. Finally, during the afternoon, PRI and F760 showed the best performances. These results demonstrate the feasibility to detect water stress using thermal and optical airborne data, pointing out the importance of careful planning of the airborne surveys as a function of the specific aims of the study.

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Section: Field Datamentioning

confidence: 99%

Discriminating Irrigated and Rainfed Maize with Diurnal Fluorescence and Canopy Temperature Airborne Maps

Rossini

Panigada

Cilia

et al. 2015

IJGI

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“…Tal índice possui a mesma dinâmica da curva de resposta de A em função de DFFFA (BILGER et al, 1995). Durante a indução da fotossíntese, observouse em ∆F/Fm´ e ETR um padrão semelhante, de forma consistente com a maior taxa de assimilação de CO 2 das plantas sem estresse de Al em relação às com estresse (Figura 1 e 5B), ou seja, o Al causou queda substancial no transporte de elétrons para fixação de CO 2 em B. Amarelo.…”

Section: Fluorescência Da Clorofila Aunclassified

Trocas gasosas e fluorescência da clorofila em seis cultivares de cafeeiro sob estresse de alumínio

et al. 2005

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RESUMOEm experimento desenvolvido em casa de vegetação e em câmara de crescimento avaliou-se o efeito do alumínio (Al) na fotossíntese de seis cultivares de cafeeiro. As plantas foram cultivadas em solução nutritiva aerada continuamente, contendo duas concentrações de Al, 0 e 0,148 mmol L -1 , fornecidas como Al 2 (SO 4 ) 3 . Após 97 dias mediram-se as taxas de assimilação de CO 2 (A) e transpiração (E), a condutância estomática (gs), a concentração interna de CO 2 (Ci), eficiência instantânea de carboxilação (Φc) e variáveis de fluorescência da clorofila. Em todas as cultivares, a presença de Al causou quedas significantes em A, gs, Φc, ocorrendo aumento em Ci. Também se observou aumento significativo na fluorescência basal (Fo) e queda na eficiência quântica máxima do fotossistema II (Fv/Fm), sugerindo injúrias na estrutura dos tilacóides causadas pelo Al. Na curva de indução de fotossíntese, observou-se que o Al causou queda no coeficiente de extinção fotoquímica da fluorescência e aumento no coeficiente de extinção não fotoquímico. Os resultados desse estudo indicaram que a queda de A foi devida à queda da condutância estomática, nas atividades bioquímicas e fotoquímicas. Palavras-chaves:Coffea arabica, toxidez de alumínio, fotossíntese, condutância estomática, indução da fotossíntese. ABSTRACT GAS EXCHANGE AND CHLOROPHYLL FLUORESCENCE IN SIX COFFEE CULTIVARS UNDER ALUMINUM STRESSExperiments were carried out under greenhouse and growth chamber to evaluate the effects of aluminum (Al) on several photosynthetic characteristics in six coffee cultivars. Plants were grown in nutrient solution aerated continuously, containing two Al concentration, 0 and 0.148 mmol L -1 , supplied as Al 2 (SO 4 ) 3 . After 97 days of treatament, measurements of CO 2 assimilation rate (A), transpiration rate (E), stomatal conductance (gs), internal CO 2 concentration (Ci), instantaneous carboxylation efficiency (Φc) and chlorophyll fluorescence related characteristics were performed. All six cultivars showed decrease in A, gs and Φc and increase in Ci. The basal chlorophyll fluorescence yield (Fo) increased and the maximum quantum efficiency (Fv/Fm) decreased suggesting structural damage in thylakoid. The photosynthetic induction curve revealed that Al caused decreases in photochemical quenching of fluorescence as well as increases of non-photochemical quenching. Our results indicated that A reduction was related to decreases in both stomatal conductance, and biochemical and photochemical damages. Key-words:Coffea arabica, aluminum toxicity, photosynthesis, stomatal conductance, photosynthesis induction.( 1 ) Recebido para publicação em 5

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“…As fluorescências em estado de equilíbrio dinâmico (F) e máxima (F m ') na presença de luz foram avaliadas em intervalos de uma hora, entre 7 e 17h. Foram calculadas as relações: eficiência quântica Bilger et al (1995).…”

Section: Methodsunclassified

Fluxo de seiva e fotossíntese em laranjeira 'Natal' com clorose variegada dos citros

Machado

Oliveira²,

Ribeiro

et al. 2006

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar os efeitos da clorose variegada dos citros (CVC), no fluxo de seiva, trocas gasosas e atividade fotoquímica em laranjeira 'Natal', com e sem CVC, em condição de campo. O curso diário do fluxo de seiva, potencial da água na folha, assimilação de CO 2 , transpiração, condutância estomática e eficiência quântica máxima e efetiva do fotossistema II foram avaliados. O delineamento experimental foi em blocos ao acaso com cinco repetições. O fluxo de seiva foi 1,9 vez superior nas plantas sadias em relação às doentes. Em plantas doentes ocorreu queda de 43, 28 e 33% na assimilação de CO 2 , condutância estomática e transpiração, respectivamente. As plantas com CVC apresentaram fotoinibição dinâmica. Uma vez que a eficiência quântica efetiva apresentou um padrão de resposta semelhante, durante o dia, em ambos os tratamentos, o efeito protetor da fotorrespiração no aparato fotoquímico em plantas com CVC é discutido. As quedas de assimilação de CO 2 , transpiração e de fluxo de seiva, nas plantas com CVC, foram decorrentes do menor valor da condutância estomática, possivelmente causado pela colonização dos vasos do xilema pela Xylella fastidiosa.Termos para indexação: Citrus sinensis, Xylella fastidiosa, assimilação de CO 2 , condutância estomática, fluorescência da clorofila, transpiração. Sap flow and photosynthesis of 'Natal' sweet orange plants with citrus variegated chlorosisAbstract -The objective of this work was to evaluate the effects of citrus variegated chlorosis (CVC) on sap flow, gas exchanges and photochemical activity in 'Natal' sweet orange plants with and without CVC under field condition. Diurnal courses of sap flow, leaf water potential, CO 2 assimilation rate and transpiration, stomatal conductance, potential and effective quantum efficiency of photosystem II were evaluated. The experiment was arranged in a random block design with five repetitions. Healthy plants showed sap flow values around 1.9 times higher than injured ones. Injured plants exhibited reductions of 43, 28 and 33% in CO 2 assimilation rate, stomatal conductance and leaf transpiration, respectively. CVC-affected plants showed dynamic photoinhibition. Since healthy and injured plants showed similar diurnal course of effective quantum efficiency, the possible influence of photorespiration on photochemical apparatus in CVC-affected plants is discussed. Reductions in CO 2 assimilation rate, transpiration and sap flow of injured plants were induced by low stomatal conductance values, which was probably due to the xylem vessel colonization by Xylella fastidiosa.

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Determination of the quantum efficiency of photosystem II and of non-photochemical quenching of chlorophyll fluorescence in the field

Cited by 440 publications

References 26 publications

Discriminating Irrigated and Rainfed Maize with Diurnal Fluorescence and Canopy Temperature Airborne Maps

Discriminating Irrigated and Rainfed Maize with Diurnal Fluorescence and Canopy Temperature Airborne Maps

Trocas gasosas e fluorescência da clorofila em seis cultivares de cafeeiro sob estresse de alumínio

Fluxo de seiva e fotossíntese em laranjeira 'Natal' com clorose variegada dos citros

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