Baixas temperaturas sobre a fluorescência da clorofila a em plantas de diferentes híbridos de canola

Perboni, Anelise Tessari; Martinazzo, Emanuela Garbin; Silva, Diolina Moura; Bacarin, Marcos Antônio

doi:10.1590/0103-8478cr20131427

Cited by 6 publications

(6 citation statements)

References 18 publications

(13 reference statements)

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“…Higher F0' throughout the day under high temperature and radiation possibly indicate limitations in the transfer of energy to the reaction centers of photosystem II [35]. Under unfavorable climatic conditions, as we observed during the hottest hours of the day in the present study, F0' increased thereby influencing the structure of PSII photosynthetic pigments [36]. On the other hand, the reduction in maximum fluorescence (Fm') during this period may have altered the photochemical activity of the plant, since high Fm' directly influence on energy transfer, which is used to reduce NADPH, ATP, and ferredoxin and thus increase the assimilation of CO2 by the leaves [37].…”

Section: Discussionsupporting

confidence: 53%

Climatic Variation on Gas Exchange and Chlorophyll a Fluorescence in Tabebuia roseoalba and Handroanthus heptaphyllus (Bignoniaceae)

Ribeiro

Coêlho

Souza

et al. 2022

Braz. arch. biol. technol.

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Climatic variation throughout the day influences the ecophysiological performance of plants at different growth stages and phases. Therefore, this work aimed to evaluate the effect of climatic variation on ecophysiological aspects of T. roseoalba and H. heptaphyllus at different hours of the day and indicate the ideal time for measuring ecophysiological variables in these species. The research was carried out in a greenhouse at the forest nursery of the Federal University of Paraíba, Campus II, in the municipality of Areia, Paraíba state, Northeastern Brazil. The experimental design was completely randomized, consisting of 10 evaluation times throughout the day (from 8 am to 5 pm), with 1 h hour interval between each evaluation. Temperature and air relative humidity inside and outside the greenhouse were evaluated to understand the effect on gas exchange (net assimilation rate of CO2, stomatal conductance, transpiration rate, internal concentration of CO2, and vapor-pressure deficit) and chlorophyll a fluorescence (initial, maximum, and variable fluorescence, photochemical quenching, and electron transport rate). Data were submitted to canonical correlation analysis and principal component analysis to verify the relationship between climatic HIGHLIGHTS• Climatic conditions influence the physiological mechanisms of species.• High irradiance and air temperature reduce photosynthetic performance of species.• The highest physiological performance of the species is between 8 am and 9 am.

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Section: Discussionsupporting

confidence: 53%

Climatic Variation on Gas Exchange and Chlorophyll a Fluorescence in Tabebuia roseoalba and Handroanthus heptaphyllus (Bignoniaceae)

Ribeiro

Coêlho

Souza

et al. 2022

Braz. arch. biol. technol.

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“…Chlorophyll fluorescence has been used to evaluate the effect of environmental factors on photosynthetic metabolism and to measure plant stress tolerance (PERBONI et al, 2015). Several studies have shown that cold stress reduces the ratio variable fluorescence to maximum fluorescence (Fv/Fm), which indicates that PSII is sensitive to low temperatures (JATIMLIANSKY et al, 2004;RAPACZ, 2007;PERBONI et al, 2015), since Fv/ Fm ratio is an indicator of the energy efficiency of the PSII reaction center (PAPAGEORGIOU; GOVINDJEE, 2011). The typical Fv/Fm values of unstressed plants range from 0.75 to 0.85, and lower values are generally observed when plants are exposed to stress (BOLHÀR-NORDENKAMPF; ÖQUIST, 1993;GUO, 2008).…”

Section: Introductionmentioning

confidence: 99%

Cold tolerance of forage plant species

Filho

Oliveira

Caramori

et al. 2018

SCA

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The occurrence of frost in southern and southeastern Brazil affects pasture quality and limits the use of forage species with high yield potential. Therefore, elucidating the cold tolerance of individual forage species could facilitate the selection of species that will optimize production and animal feeding throughout the year. Accordingly, the aim of the present study was to evaluate the cold tolerance of forage species to low temperatures, based on cell membrane stability and photoinhibition. Alfalfa (Medicago sativa), sorghum (Sorghum bicolor), black oat (Avena strigosa), marandu grass (Urochloa brizantha), pearl millet (Pennisetum americanum), mombaça grass (Megathyrsus maximus), and bermuda grass 'Tifton 85' (Cynodon spp) plants were subjected to temperatures of 0.2, -0.9, -1.8, -2.7, -4.1, -4.6, and -6.2 °C for 1 h in a growth chamber. Cell membrane stability and photoinhibition were based on the electrical conductivity of leaf section solutions and chlorophyll fluorescence, respectively. Initial cold damage corresponded to a sudden increase in leaf solution conductivity and decrease in fluorescence. Millet and sorghum were able to tolerate exposure to temperatures as low as -2.7 °C, whereas black oat, marandu grass, alfafa, and mombaça grass were able to tolerate exposure to -4.1 °C, and bermuda grass 'Tifton 85' was able to withstand temperatures below -6.2 °C. Key words: Frost. Fluorescence. Ion lixiviation. Conductivity test. Low temperature. ResumoA ocorrência de geadas no Sudeste e Sul do Brasil afeta a qualidade das pastagens e limita o uso de espécies com elevado potencial produtivo. O conhecimento da tolerância das forrageiras ao estresse por baixa temperatura contribui para a seleção das melhores espécies a serem utilizadas, levando à otimização de sua produção e garantindo o pastejo dos animais o ano inteiro. Assim, o objetivo deste trabalho foi avaliar a tolerância de espécies forrageiras às temperaturas baixas pela estabilidade da membrana celular e fotoinibição após o estresse por frio. Foram analisadas as forrageiras: alfafa (Medicago sativa), sorgo (Sorghum bicolor), aveia-preta (Avena strigosa), capim-marandu (Urochloa brizantha), milheto (Pennisetum americanum), capim-mombaça (Megathyrsus maximus) e Tifton 85 (Cynodon spp). As plantas foram submetidas às temperaturas de 0,2; -0,9; -1,8; -2,7; -4,1; -4,6 e -6,2 ºC, durante uma hora, no interior de câmara de crescimento com condições de luminosidade e temperatura controladas, e avaliadas por meio do teste de condutividade elétrica da solução de secções foliares e fluorescência. O início dos danos correspondeu a um aumento súbito na condutividade elétrica da solução e diminuição na fluorescência. A tolerância das espécies forrageiras ao frio foi até a temperatura

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“…In the literature, the chlorophyll fluorescence technique has been used to assess responses to cold stress in other plant species. In canola (Brassica napus L.), for example, after a certain period, the same level of quantum yield was found for plants under the cold and control treatments (Perboni et al, 2015). However, in oat (Avena sativa L.) plants subjected to cold stress, there was a lower drop in Fv/Fm and a better recovery after stress in the cultivars tolerant to low temperatures (Rizza et al, 2001).…”

Section: Resultsmentioning

confidence: 81%

“…The drop in Fm in plant leaves as temperature decreases is likely associated with an increase in the rate of chlorophyll breakdown, which exceeds the synthesis rate, as commonly found for plants subjected to cold stress (Pospísil et al, 1998;Mishra et al, 2011). This decrease in Fm and the increase in Fo led to a consequent decrease in Fv/Fm, meaning that the ability to absorb light and transfer electrons in the Z scheme of photosynthesis became impaired (Rizza et al, 2001;Mishra et al, 2011;Perboni et al, 2015).…”

Section: Resultsmentioning

confidence: 86%

Morphophysiological responses of Setaria viridis to cold stress

Carvalho

Santos

Vieira

et al. 2022

Pesq. agropec. bras.

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The objective of this work was to determine the suitability of Setaria viridis as a model plant in studies to validate candidate genes for cold tolerance by evaluating the response of two of its accessions to different durations of abrupt or gradual cold stress in the vegetative and reproductive stages. Plants of accessions A10.1 and Ast-1, cultivated at 25°C, were subjected to the following cold stress treatments: gradual reduction in temperature from 25 to 0°C, 5°C at a time, every 24 hours in a same chamber; or abrupt reduction in temperature, by transferring plants from a chamber at 25°C to another at 0°C. Plants were kept at 0°C for 3, 5, or 10 days, after which temperature was increased back again to 25°C; a control group remained at 25ºC. Low temperatures – reduced abruptly or gradually – caused a decrease in the gas exchange rates and shoot and root biomass of the plants, besides damage to their photochemical apparatus; the longer the cold lasted, the more pronounced the effect was. Regardless of stress duration, plants recovered and completed their life cycle. The studied accessions are tolerant to cold and, therefore, are not suitable as a model plant in studies to validate candidate genes for cold tolerance.

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Baixas temperaturas sobre a fluorescência da clorofila a em plantas de diferentes híbridos de canola

Abstract: Baixas temperaturas sobre a fluorescência da clorofila a em plantas de diferentes híbridos de canola.Ciência Rural, v.45, n.2, fev, 2015.

Cited by 6 publications

References 18 publications

Climatic Variation on Gas Exchange and Chlorophyll a Fluorescence in Tabebuia roseoalba and Handroanthus heptaphyllus (Bignoniaceae)

Climatic Variation on Gas Exchange and Chlorophyll a Fluorescence in Tabebuia roseoalba and Handroanthus heptaphyllus (Bignoniaceae)

Cold tolerance of forage plant species

Morphophysiological responses of Setaria viridis to cold stress

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