Biochemical and molecular basis for impairment of photosynthetic potential

Pell, Eva J.; Eckardt, Nancy A.; Glick, Richard E.

doi:10.1007/bf00014598

Cited by 116 publications

(60 citation statements)

References 48 publications

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“…Among the parameters most associated with this decrease in the present study are maximum rate of carboxylation of rubisco, which presented significant reduction in Fepagro (experiment 1), Guapo (experiment 1) and Pinto (experiment 5), and carboxylation efficiency which presented a significant reduction in Fepagro cultivar (experiment 4) and Guapo cultivar (experiment 1) and the tendencies to reduction in Fepagro cultivar (experiment 1), Macotaço cultivar (experiment 1) and Pinto cultivar (experiment 5). Both maximum rate of carboxylation of rubisco, and carboxylation efficiency reflect the activity of rubisco in vivo (Rogers and Humphries 2000), and carboxylation reductions were considered the main factors responsible for impairment in photosynthesis by Pell et al (1994) and Guidi et al (2001). Guidi et al (2000), working with bean plants of Pinto cultivar, also found results that agree with the idea that the primary target of ozone are the enzymes involved in the Calvin cycle and, particularly, rubisco activity.…”

Section: Dry Mass Accumulationsupporting

confidence: 56%

“…According to Pell et al (1994), the photosynthetic process may be affected by the occurrence of damage involving stomatal movements, the collection of light or the biochemical stage of CO 2 fixation. The total photosynthetic capacity of the plant may also be reduced by loss of leaves (accelerated senescence, and/or reduced production), and by the increased respiratory rate to perform functions such as repairing cell constituents, or by the increased production of certain compounds (ATP and reductant compounds) needed for detoxification and defense (Mooney and Winner, 1988).…”

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confidence: 99%

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Physiological disturbances promoted by ozone in five cultivars of Phaseolus vulgaris L.

Clebsch

Divan

Oliveira

et al. 2009

Braz. J. Plant Physiol.

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Bean seedlings of Fepagro 26, Guapo Brilhante, Iraí, Macotaço and US Pinto 111 cultivars were submitted to treatments with or without addition of ozone to the ambient air, in order to evaluate the effects of exposure on photosynthesis, relative electrolyte leakage, foliar abscission and biomass of the seedlings. Exposure to ozone caused significant decreases in the net assimilation of all cultivars except Iraí. It also caused a significant increase in electrolyte leakage from the Pinto cultivar, but only when AOT 40 was the highest. It also produced significant anticipation in the time of foliar abscission in the Pinto, Fepagro and Guapo cultivars. The variability observed in the biomass measurements reflected the limitations to perform long-term controlled-environment studies, one of the major challengers yet to be overcome in order to obtain more conclusive data on damages induced on crop species resulting from tropospheric ozone enrichment.Key words: photosynthesis, relative electrolyte leakage, foliar abscission, biomass. resuMo Distúrbios fisiológicos promovidos pelo ozônio em cinco cultivares de Phaseolus vulgaris l. Plântulas de feijão das cultivares Fepagro 26, Guapo Brilhante, Iraí, Macotaço e US pinto 111 foram submetidas aos tratamentos com e sem adição de ozônio ao ar ambiente, com o objetivo de avaliar os efeitos da exposição sobre a fotossíntese, permeabilidade relativa a eletrólitos, abscisão foliar e biomassa das plântulas. A exposição ao ozônio causou decréscimos significativos na assimilação líquida de todas as cultivares, exceto na Iraí. Causou também um aumento significativo na permeabilidade relativa a eletrólitos da cultivar Pinto, mas apenas quando a AOT 40 foi a mais elevada. Além disso, produziu uma antecipação significativa no tempo de abscisão foliar nas cultivares Pinto, Fepagro e Guapo. A variabilidade observada nas medidas de biomassa total, refletiu as limitações para se executar estudos de longo prazo em condições ambientais controladas, um dos principais desafios ainda por ser superado antes que se possa obter dados mais conclusivos sobre os danos em espécies cultivadas resultantes do enriquecimento do ozônio toposférico.

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Section: Dry Mass Accumulationsupporting

confidence: 56%

mentioning

confidence: 99%

Physiological disturbances promoted by ozone in five cultivars of Phaseolus vulgaris L.

Clebsch

Divan

Oliveira

et al. 2009

Braz. J. Plant Physiol.

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“…A fotossíntese é um processo sensível à poluição aérea e sua redução tem sido constatada com freqüência em plantas ocorrentes ou introduzidas em locais poluí-dos (Inoue & Reissmann 1994, Pandey & Agrawal 1994, Pfanz et al 1994, Reich et al 1994). Segundo Pell et al (1994), o processo fotossintético pode ser afetado pela ocorrência de danos envolvendo os movimentos estomáticos, a coleta de luz ou a etapa bioquímica de fixação do CO2. Como neste estudo não foram observadas diferenças nas taxas de condutância estomática e de transpiração (tabela 1), acredita-se que a redução da fotossíntese tenha sido causada por outros fatores, envolvendo alterações na coleta de luz ou na quantidade e atividade da ribulose-1,5-bisfosfato carboxilase-oxigenase (RUBIS-CO).…”

Section: Resultsunclassified

Respostas de indivíduos jovens de Tibouchina pulchra Cogn. à poluição aérea de Cubatão, SP: fotossíntese líquida, crescimento e química foliar

Moraes¹,

Delitti²,

Moraes³

2000

Rev. bras. Bot.

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-(Responses of saplings of Tibouchina pulchra Cogn. to air pollution in Cubatão, SP: net photosynthesis, growth and leaf chemistry). Saplings of Tibouchina pulchra, cultivated on standardised conditions, were placed in three sites at the Cubatão region to study the effects of the air pollutants on photosynthesis, growth and leaf concentrations of ascorbic acid, chlorophyll, nitrogen, sulfur and fluoride. The study areas were: Pilões river valley (RP), considered as the reference plot; Caminho do Mar (CM), near the petrochemical industries; and Mogi river valley (VM), near metallurgical and fertilizer industries. Four plants remained in each plot during six months. Compared to the reference plot (RP -9.81 µmol.m -2 .s -1 ), net photosynthesis was reduced (p < 0.05) in plants at the VM site (8.02 µmol.m -2 .s -1 ), and it was not altered in the other area (CM -9.29 µmol.m -2 .s -1 ). Plants grown in VM showed reduction in height and the amount of ascorbic acid, alterations on the pattern of biomass distribution in the plant, increased concentrations of chlorophyll a and b, fluoride, nitrogen and sulfur. Plants exposed in CM showed reduction in both height and diameter, and enhanced concentrations of chlorophyll a and b, fluoride, N and S. The results indicate that pollutant concentrations have still been at phytotoxic levels in VM and CM and this problem was more intensive in VM, during the exposure period.RESUMO -(Respostas de indivíduos jovens de Tibouchina pulchra Cogn. à poluição aérea de Cubatão, SP: fotossíntese, crescimento e química foliar). Indivíduos jovens de Tibouchina pulchra, cultivados em condições padronizadas, foram colocados em três regiões de Cubatão para estudo dos possíveis efeitos dos poluentes aéreos sobre a fotossíntese, o crescimento e as concentrações foliares de ácido ascórbico, clorofila, nitrogênio, enxofre e flúor. As áreas de estudo foram: vale do rio Pilões (RP), considerada área de referência; Caminho do Mar (CM), próxima a indústrias petroquímicas e vale do rio Mogi (VM), próxima a indústrias siderúrgicas e de fertilizantes. Quatro plantas permaneceram em cada área por um período de seis meses. Em comparação com as plantas mantidas na área de referência (RP -9,81 µmol.m -2 .s -1 ), a fotossíntese líquida foi reduzida (p < 0,05) nas plantas que foram mantidas em VM (8,02 µmol.m -2 .s -1 ), e não foi alterada em CM (9,29 µmol.m -2 .s -1 ). Em VM, as plantas apresentaram redução do crescimento em altura e do conteúdo de ácido ascórbico, alteração no padrão de distribuição de biomassa entre as partes da planta e aumento das concentrações foliares de clorofila a e b, flúor, nitrogênio e enxofre. As plantas de CM apresentaram redução no crescimento em altura e diâmetro, aumento nas concentrações foliares de clorofila a e b, flúor, nitrogênio e enxofre. Os resultados obtidos indicam que as concentrações de poluentes ainda se encontram em níveis fitotóxicos em CM e VM, tendo sido mais altas em VM, durante o período de exposição.

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“…5), respectively. The reduction in A sat , chlorophyll degradation and lipid peroxidation in turn may lead to accelerated leaf senescence (Fangmeier et al, 1994;Mulholland et al, 1997;Pell et al, 1994), which has been widely reported for many species including wheat as a typical physiological symptom induced by elevated O 3 Finnan et al, 1998;Miller et al, 1999;Pell et al, 1994;Ribas et al, 2005). Among foliar pigments, carotenoids play an important role in photosynthetic reaction centra by both participating the process of energy-transfer and providing a mechanism for plant photoprotection against photooxidation (Davies, 2004).…”

Section: Discussionmentioning

confidence: 99%

Differential effects of ozone on photosynthesis of winter wheat among cultivars depend on antioxidative enzymes rather than stomatal conductance

Feng

Wang

Pleijel

et al. 2016

Science of The Total Environment

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• 5 modern cultivars of wheat were investigated under fully open-air field conditions. • Significant O 3 effects were only found during the mid-grain filling stage.• The lower photosynthetic rates were mainly due to nonstomatal factors.• Antioxidative enzymes contributed to the differential response to E-O 3 among cultivars. from the initiation of tillering to final harvest. Pigments, gas exchange rates, chlorophyll a fluorescence, antioxidants contents, antioxidative enzyme activity and lipid oxidation were measured in three replicated plots throughout flag leaf development. Results showed that significant O 3 effects on most variables were only found during the mid-grain filling stage. Across five cultivars, E-O 3 significantly accelerated leaf senescence, as indicated by increased lipid oxidation as well as faster declines in pigment amounts and photosynthetic rates. The lower photosynthetic rates were mainly due to non-stomatal factors, e.g. lower maximum carboxylation capacity and electron transport rates. There were strong interactions between O 3 and cultivar in photosynthetic pigments, light-saturated photosynthesis rate and chlorophyll a fluorescence with O 3 -sensitive (Y19, Y2 and Y15) and O 3 -tolerant (J2, Y16) cultivars being clearly differentiated in their responses to E-O 3 . E-O 3 significantly influenced the antioxidative enzymes but not antioxidant contents. G R A P H I C A L A B S T R A C T a b s t r a c t a r t i c l e i n f o Contents lists available at ScienceDirectScience of the Total Environment j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / s c i t o t e n v cultivar were found in antioxidative enzymes, such as SOD and CAT, but not in stomatal conductance (g s ). Therefore, it can be concluded that antioxidative enzymes rather than g s or antioxidants are responsible for the differential responses to E-O 3 among cultivars. These findings provide important information for the development of accurate modeling O 3 effects on crops, especially with respect to the developmental stage when O 3 damage to photosynthesis becomes manifest.

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Biochemical and molecular basis for impairment of photosynthetic potential

Cited by 116 publications

References 48 publications

Physiological disturbances promoted by ozone in five cultivars of Phaseolus vulgaris L.

Physiological disturbances promoted by ozone in five cultivars of Phaseolus vulgaris L.

Respostas de indivíduos jovens de Tibouchina pulchra Cogn. à poluição aérea de Cubatão, SP: fotossíntese líquida, crescimento e química foliar

Differential effects of ozone on photosynthesis of winter wheat among cultivars depend on antioxidative enzymes rather than stomatal conductance

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