Growth and physiological responses of sunflower plants exposed to ultraviolet-B radiation

Cechin, Inês; Fumis, Terezinha de Fátima; Dokkedal, Anne Lígia

doi:10.1590/s0103-84782007000100014

Cited by 25 publications

(19 citation statements)

References 30 publications

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“…In the UV-B stressed almond plants, the decrease in Chl a, Chl b, and Chl (a+b), suggests a possible damage of the light-harvesting complex. Similar responses were observed in Sinapsis alba (Jennifer et al 2000) and Helianthus annuus L. (Cechin et al 2007) plants.…”

Section: Discussionsupporting

confidence: 74%

“…Several studies have confirmed the deleterious effects of UV-B radiation on photosynthetic processes (Keiller and Holmes 2001, Mészáros et al 2001, Correia et al 2005, Cechin et al 2007) but less is known about the way how UV-B radiation affects photosynthetic activity in almond plants. The significant reduction in P N suggests that UV-B treatment can affect photosynthesis by affecting enzyme activity, primary photochemistry, electron transport, biochemical reactions of the Calvin cycle, as well as changes in the structure of the chloroplasts (Borman 1989, Ambasht and Agrawal 1995, Balakrishnan et al 2005, Cechin at al. 2007.…”

Section: Discussionmentioning

confidence: 99%

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Photosynthesis performance in sweet almond [Prunus dulcis (Mill) D. Webb] exposed to supplemental UV-B radiation

Ranjbarfordoei¹,

Samson²,

Damme³

2011

Photosynt.

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Due to anthropogenic influences, solar UV-B irradiance at the earth's surface is increasing. To determine the effects of enhanced UV-B radiation on photosynthetic characteristics of Prunus dulcis, two-year-old seedlings of the species were submitted to four levels of UV-B stress, namely 0 (UV-B c ), 4.42 (UV-B 1 ), 7.32 (UV-B 2 ) and 9.36 (UV-B 3 ) kJ m -2 d -1 . Effects of UV-B stress on a range of chlorophyll (Chl) fluorescence parameters (FPs), Chl contents and photosynthetic gas-exchange parameters were investigated. UV-B stress promoted an increase in minimal fluorescence of dark-adapted state (F 0 ) and F 0 /F m , and a decrease in variable fluorescence (F v , F v /F m , F v /F 0 and F 0 /F m ) due to its adverse effects on photosystem II activity. No significant change was observed for maximal fluorescence of dark-adapted state (F m ). Enhanced UV-B radiation caused a significant inhibition of net photosynthetic rate (P N ) at UV-B 2 and UV-B 3 levels and this was accompanied by a reduction in stomatal conductance (g s ) and transpiration rate (E). The contents of Chl a, b, and total Chl content (a+b) were also significantly reduced at increased UV-B stress. In general, adverse UV-B effects became significant at the highest tested radiation dose 9.36 kJ m -2 d -1 . The most sensitive indicators for UV-B stress were F v /F 0 , Chl a content and P N . Significant P<0.05 alteration in these parameters was found indicating the drastic effect of UV-B radiation on P. dulcis.

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Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Photosynthesis performance in sweet almond [Prunus dulcis (Mill) D. Webb] exposed to supplemental UV-B radiation

Ranjbarfordoei¹,

Samson²,

Damme³

2011

Photosynt.

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“…The content of phenolics was not significantly modified under exposure to supplementary UV radiation either. Our results are consistent with the previously published findings [4,19]. Minor changes in the concentrations of photosynthetic pigments can probably be attributed to the short time of UV-B exposure.…”

Section: Resultssupporting

confidence: 93%

UV-B radiation increases anthocyanin levels in cotyledons and inhibits the growth of common buckwheat seedlings

Dębski¹,

Szwed²,

Wiczkowski³

et al. 2016

Acta Biologica Hungarica

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The impact of short-term UV-B treatment on the content of individual flavonoids and photosynthetic pigments in cotyledons and the growth of common buckwheat (Fagopyrum esculentum Moench) seedlings was investigated. Seeds of four common buckwheat cultivars were germinated in darkness over a period of 4 days and acclimatized for 2 days under a 16/8 h light/dark photoperiod at 24/18 °C day/night, and exposure to 100-120 μmol • m -2 • s -1 of photosynthetically active radiation (PAR). Seedlings were divided into three batches, including two batches subjected to different doses of UV-B (5 W • m -2 and 10 W • m -2 , one hour per day) for 5 days, and a control group exposed to PAR only. Exposure to UV-B increased anthocyanin levels in the cotyledons of all examined cultivars, it inhibited hypocotyl elongation, but did not affect the content of photosynthetic pigments. Flavone concentrations increased in cv. Red Corolla and Kora, remained constant in cv. Panda and decreased in cv. Hruszowska. Exposure to UV-B decreased rutin levels in cv. Hruszowska, but not in the remaining cultivars. Cultivars Hruszowska, Panda and Kora appeared to be less resistant to UV-B than Red Corolla. Higher resistance to UV-B radiation in Red Corolla can probably be attributed to its higher content of anthocyanins and rutin in comparison with the remaining cultivars.

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“…La radiación UV-B no afecta la biomasa, materia seca de brotes, peso específico de las hojas ni compuestos absorbentes de UV-B del girasol cultivado en invernadero y esto se debe a la temprana etapa de desarrollo en la que se impuso el estrés (Cechin et al, 2007), ya que la planta puede aumentar el espesor de la hoja como respuesta al estrés por radiación UV-B (Liu et al, 2005) disminuyendo de esta forma el daño UV-B, de lo contrario, al no darse un incremento en el espesor de la hoja la radiación UV-B alcanza el mesófilo y puede afectar el proceso de fotosínte-sis. Por esta razón, la radiación UV-B inhibió significativamente la fotosíntesis acompañada por una reducción en la conductancia estomática y en la transpiración, aunque el contenido total de clorofila y la eficiencia máxima potencial del PS II no se vieron afectados.…”

Section: Estrés Por Radiación Ultravioleta-bunclassified

“…Por esta razón, la radiación UV-B inhibió significativamente la fotosíntesis acompañada por una reducción en la conductancia estomática y en la transpiración, aunque el contenido total de clorofila y la eficiencia máxima potencial del PS II no se vieron afectados. En general, el estudio de Cechin et al (2007) sugiere que a pesar de que la biomasa seca no se afecte, el nivel actual de radiación UV-B solar afecta el rendimiento de las plantas de girasol.…”

Section: Estrés Por Radiación Ultravioleta-bunclassified

Fluorescencia como indicador de estrés en <i>Helianthus annuus</i> L. Una revisión

Jiménez-Suancha

Álvarado

Balaguera-López

2015

Rev. Colomb. Cienc. Hortic.

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Plantulas de tomate.Foto: Álvarez-Herrera. RESUMENEl girasol es una Asteraceae con alto potencial como planta de corte. Esta planta está expuesta a una amplia fluctuación de condiciones ambientales como luz, temperatura, suministro de agua y nutrientes. Estas condiciones pueden generar estrés sobre las plantas. El girasol presenta resistencia a la sequía, bajas y altas temperaturas. Los efectos del estrés dependen de la intensidad y de la etapa fenológica en que se presente. La fluorescencia puede ser empleada como herramienta para obtener información acerca de la influencia del estrés sobre el estado fisiológico del aparato fotosintético de las plantas y su respuesta será indicadora del daño o alteración en él. El objetivo de la presente revisión es exponer resultados de investigaciones científicas sobre los diferentes tipos de estrés evaluados en Helianthus annuus y la forma como ha sido empleada la fluorescencia como un indicador de dicho estrés. Contribuyendo así a ampliar la información disponible sobre esta importante especie.

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Growth and physiological responses of sunflower plants exposed to ultraviolet-B radiation

Abstract: The effects of UV-B radiation were studied in sunflower plants

Cited by 25 publications

References 30 publications

Photosynthesis performance in sweet almond [Prunus dulcis (Mill) D. Webb] exposed to supplemental UV-B radiation

Photosynthesis performance in sweet almond [Prunus dulcis (Mill) D. Webb] exposed to supplemental UV-B radiation

UV-B radiation increases anthocyanin levels in cotyledons and inhibits the growth of common buckwheat seedlings

Fluorescencia como indicador de estrés en <i>Helianthus annuus</i> L. Una revisión

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