Eficiência fotoquímica de gramíneas forrageiras tropicais submetidas à deficiência hídrica

Silva, Manoel Messias Pereira da; Vásquez, Hernán; Bressan-Smith, Ricardo; Silva, José Fernando Coelho da; Erbesdobler, Eleonora D'Avila; Andrade, Paulo Sérgio Cruz de

doi:10.1590/s1516-35982006000100008

Cited by 23 publications

(15 citation statements)

References 21 publications

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“…Silva et al (2006) comment that reductions in Fm can be related to the photoinhibition of the quinone, associating them to the inactivation of PSII in the membranes of the thylakoids, compromising the flow of electrons between the photosystems. Freire et al (2014) observed reduction in Fm from 2256 to 2048 in leaves of yellow passion fruit when irrigation water salinity increased from 0.5 to 4.5 dS m -1 , which is equivalent to a reduction of 9.2%, similar to that observed in the present study.…”

Section: Resultsmentioning

confidence: 99%

Quantum efficiency of photosystem II and production of orange under salt stress and nitrogen fertilization

Sousa

Gheyi

Brito

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThis study aimed to evaluate the salt tolerance of 'Mimo do Céu' orange grafted onto three rootstocks using physiological parameters such as maximum quantum efficiency of photosystem II (PSII) and the production of fruits. It also evaluated the effectiveness of increased nitrogen (N) fertilization in reducing the effects of salt stress. Two concomitant experiments were carried out under controlled conditions, using drainage lysimeters. The Experiment I evaluated the effects of the application of five levels of saline water on three combinations of scion-rootstocks grafted with 'Mimo de Ceu' orange, in a randomized block design with three replicates in a 5 x 3 factorial scheme. The Experiment II evaluated the application of two N levels (100 and 200% of recommendation) in three scion-rootstock combinations irrigated with water of electrical conductivity of 3.0 dS m -1 , in a 3 x 2 factorial scheme, with three replicates. The maximum quantum efficiency of PSII was inhibited in citrus plants under salt stress. 'Mimo do Ceu' orange grafted onto 'Common' Rangpur lime has higher yield potential. The increase in N dose did not reduce the deleterious effects of water salinity on fruit production.Eficiência quântica do fotossistema II e produção de laranjeira sob estresse salino e adubação nitrogenada R E S U M O Objetivou-se, com este trabalho, avaliar a tolerância ao estresse salino da laranjeira 'Mimo do Céu' enxertada em três porta-enxertos utilizando como parâmetros fisiológicos, a eficiência quântica do fotossistema II e a produção de frutos. Também se avaliou a eficiência máxima do incremento da adubação nitrogenada na redução dos efeitos do estresse salino; para tanto foram realizados dois experimentos concomitantes em condições controladas e com auxílio de lisímetros de drenagem. No Experimento I foram estudados em blocos casualizados com três repetições, em esquema fatorial 5 x 3, cinco níveis de salinidade da água e três combinações de copa/porta-enxerto e no Experimento II estudou-se a aplicação de duas doses de N (100 e 200% da recomendação) em plantas das três combinações de copa/porta-enxerto irrigadas com águas de condutividade elétrica de 3,0 dS m -1 , em esquema fatorial 3 x 2 com três repetições. A eficiência máxima quântica do PSII foi inibida nas plantas cítricas com estresse salino; já o aumento do teor salino da água de irrigação reduz a produção de frutos e a laranjeira 'Mimo do Céu' enxertada no Limoeiro Cravo 'Comum' possui maior potencial produtivo. O aumento na fertilização nitrogenada não reduziu os efeitos da salinidade sobre a produção total de frutos.

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Section: Resultsmentioning

confidence: 99%

Quantum efficiency of photosystem II and production of orange under salt stress and nitrogen fertilization

Sousa

Gheyi

Brito

et al. 2016

Rev. bras. eng. agríc. ambient.

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“…In fact, the activity of chlorophyll has been analyzed to understand the changes in photosynthesis caused by biotic or abiotic stresses, such as temperature (Oliveira et al, 2002), radiation (Mazza et al, 2000), water deficiency (Silva et al, 2006), salinity (Belkhodja et al, 1994), presence of insects (Bown et al, 2002) and herbicides (Ferreira et al, 2015). According to Baker and Rosenqvist (2004), under the effect of herbicide the reduction of chlorophyll activity occurs due to the reduction in the capture efficiency of the excitation energy by the reaction centers opened by PS II, which generates reduction in the quantum yield of the electron transport.…”

Section: (A) (B) (C) (D)mentioning

confidence: 99%

CHLOROPHYLL FLUORESCENCE IN Brachiaria decumbens AND Brachiaria ruziziensis SUBMITTED TO HERBICIDES

et al. 2017

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“…Matos et al (2010) credited the increase in the minimal fluorescence in Cicer arietinum under water restriction to the reaction center, showing that the greatest losses occur during the energy transfer from the antenna after excitation. Silva et al (2006) showed that the reduction in the Fm was observed in the non-irrigated water regime in both genotypes. They indicated in general the faulty photoreduction of quinone A (QA), the primary electron acceptor of photosystem II, which may be associated with PSII inactivation in the thylakoid membranes, directly affecting the electron flow between the photosystems.…”

Section: Variables Of Chlorophyll a Fluorescencementioning

confidence: 81%

Determination of parameters for selection of Eucalyptus clones tolerant to drought

Silva¹,

Souza²,

Rodrigues³

et al. 2016

Afr. J. Agric. Res.

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Climatic changes have induced the spread of aridity in many parts of the globe. Eucalyptus plantations show wide variations in productivity due to several factors, including climatic changes. Therefore, Eucalyptus genotypes that can adapt to such conditions is very welcome. Thus, an evaluation was done by comparing the physiological responses of two Eucalyptus genotypes, tolerant and droughtsensitive. They were assessed in different stages of experimental period and the rate of chlorophyll and chlorophyll fluorescence (minimal fluorescence and maximal fluorescence) were recorded. The potential photosystem II (PSII) quantum efficiency was then calculated. A decline in the rate of total chlorophyll (values below 25) and in the minimal fluorescence (values below 190) in clone sensitive due to the water stress was observed, while an increase was noted in clone tolerant to aridity. A reduction in the maximal fluorescence and photochemical efficiency was recorded in the genotype not being irrigated, with an earlier and more severe effect being verified for the sensitive genotype with values below 300 and 0.40, respectively. The variables studied confirm that clone tolerant exhibits greater drought tolerance, thus indicating that the photochemical efficiency of photosystem II is a reliable tool that enables the nondestructive choice of genotypes naturally tolerant to water scarcity conditions.

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Eficiência fotoquímica de gramíneas forrageiras tropicais submetidas à deficiência hídrica

Cited by 23 publications

References 21 publications

Quantum efficiency of photosystem II and production of orange under salt stress and nitrogen fertilization

Quantum efficiency of photosystem II and production of orange under salt stress and nitrogen fertilization

CHLOROPHYLL FLUORESCENCE IN Brachiaria decumbens AND Brachiaria ruziziensis SUBMITTED TO HERBICIDES

Determination of parameters for selection of Eucalyptus clones tolerant to drought

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