UV-B exposure enhances senescence of wheat leaves: modulation by photosynthetically active radiation

Pradhan, Manoj Kumar; Joshi, Padmanava; Nair, J.P.; Ramaswamy, N.K.; Iyer, Ramkumar K.; Biswal, Basanti; Biswal, U. C.

doi:10.1007/s00411-006-0055-2

Cited by 21 publications

(12 citation statements)

References 41 publications

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“…The response of leaves to UV-B exposure in combination with photosynthetically active radiation (PAR) is different from the response to UV-B exposure in the absence of PAR, demonstrating the PAR-mediated alleviation of UV-B induced damage (Adamse and Britz 1992, Kolb et al 2001, Bergo et al 2003, Pradhan et al 2006. Similar protective role of low irradiance by "white light" against UV-B induced impairment in photosynthetic apparatus of cyanobacterium Spirulina platensis was also found (Rajagopal et al 2005).…”

Section: Introductionmentioning

confidence: 76%

“…Sonalika) seedlings were grown in Petri plates on cotton soaked with distilled water under fluorescent "white light" of 200 μmol m -2 s -1 at 25±2 °C following the method of Joshi et al (1993) for a period of 15 d. One set of seedlings were exposed to UV-B radiation (PPFD 60 μmol m -2 s -1 obtained from a Philips TL 20 type 05 in the spectral range 280-320 nm and with a peak at 315 nm; without UV-A and UV-C components) in the absence of PAR (UV-B) while another set of seedlings were exposed to UV-B radiation in combination with PAR (UV-B+PAR) for 1 h daily from d 1 until d 15 as per Pradhan et al (2006). The primary leaves of these seedlings were used for various measurements.…”

Section: Methodsmentioning

confidence: 99%

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Developmental phase-dependent photosynthetic responses to ultraviolet-B radiation: damage, defence, and adaptation of primary leaves of wheat seedlings

Pradhan¹,

Nayak²,

Joshi³

et al. 2008

Photosynt.

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Alterations in photosynthetic capacity of primary leaves of wheat seedlings in response to ultraviolet-B (UV-B; 280-320 nm; 60 μmol m -2 s -1 ) exposure alone and in combination with photosynthetically active radiation (PAR; 400-800 nm; 200 μmol m -2 s -1 ) during different phases of leaf growth and development were assessed. UV-B exposure resulted in a phase-dependent differential loss in photosynthetic pigments, photochemical potential, photosystem 2 (PS2) quantum yield, and in vivo O 2 evolution. UV-B exposure induced maximum damage to the photosynthetic apparatus during senescence phase of development. The damages were partially alleviated when UV-B exposure was accompanied by PAR. UV-B induced an enhancement in accumulation of flavonoids during all phases of development while it caused a decline in anthocyanin content during senescence. The differential changes in these parameters demonstrated the adaptation ability of leaves to UV-B stress during all phases of development and the ability was modified in UV-B+ PAR exposed samples.

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Section: Introductionmentioning

confidence: 76%

Section: Methodsmentioning

confidence: 99%

Developmental phase-dependent photosynthetic responses to ultraviolet-B radiation: damage, defence, and adaptation of primary leaves of wheat seedlings

Pradhan¹,

Nayak²,

Joshi³

et al. 2008

Photosynt.

Self Cite

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“…Because of the low activity of SOD, POD and CAT in wheat, poisonous free radical production would not be eliminated quickly. As a result, they could not prevent lipid peroxidation production [10]. Our results suggest that enhanced expression of SOD, POD and CAT evolving complex protein and aldolases are some of the protective responses of wheat to He-Ne lasers.…”

Section: Discussionmentioning

confidence: 72%

Protecting effect of He-Ne laser on winter wheat from UV-B radiation damage by analyzing proteomic changes in leaves

Jia¹,

Duan²

2013

ABB

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The ultraviolet-B (UV-B) radiation can affect gene expression of plant in growth and development. Winter wheat (Triticum aestivum), as a kind of economic crop cultured in the Northern China, is also damaged by present-day ultraviolet-B (UV-B) radiation. It was reported that He-Ne lasers could alleviate cell damage caused by UV-B radiation in plants. To get the proteomic changes of wheat alleviated by He-Ne lasers, we studied protein expression profiles of winter wheat (Jin Mai NO.79) leaves by running 2-DE (two-dimensional gel electrophoresis), which allowed the identification of some significantly different gel spots. The spots were further verified by matrix-assisted laser desorption/ionization-time of flight mass spectrometry, in which they were confirmed to be winter wheat proteins. The results showed: 1) the proteomic changes between the ultraviolet-B radiation group and normal light group were significantly different on sixth day; 2) The expression of some proteins such as catalase, DNA polymerase and reduced glutathione declines at the ultraviolet-B radiation group and increases at the UV-B + He-Ne laser group. This indicates UV-B could regulate genes encoding proteins in Winter wheat leaves and affect the growth of the Winter wheat. He-Ne lasers treatment could significantly alleviate UV-B-induced damage in wheat.

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“…Contradictory results reported in the literature can be explained by the fact that plant responses to UV-B radiation depend on a number of parameters, including the developmental stage of tissue, the plant species, and growth conditions. Moreover, plant responses to UV-B radiation are dependent on the UV-B level of exposure and the ratio of PAR to UV-B under experimental conditions (Pradhan et al, 2006). In passion fruit plants, the reduction in the CO 2 assimilation rates due to UV-B exposure were accompanied by a significant inhibition in shoot dry matter accumulation, from 2.47 g in control to 1.77 g in the stressed plants (Figure 4).…”

Section: Resultsmentioning

confidence: 99%

Sensitivity of yellow passion fruit to ultraviolet-B radiation

Cechin¹,

Rocha²,

Fumis³

2012

Pesq. agropec. bras.

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-The objective of this work was to evaluate the effects of UV-B radiation on the vegetative growth and on the gas exchange characteristics of passion fruit plants (Passiflora edulis) grown in greenhouse. The average unweighted UV-B radiation near the apex of the plants was 8 W m -2 for the UV-B treatment (high UV-B), and 0.8 W m -2 for the control plants (low UV-B). Plants were irradiated with UV-B for 7 hours per day, centered on solar noon, during 16 days. High UV-B radiation resulted in lower shoot dry matter accumulation per plant. The content of UV-B absorbing compounds and anthocyanins was increased in the plants exposed to high UV-B radiation, when compared with the control. UV-B radiation did not affect stomatal conductance or transpiration rate, but reduced photosynthesis and instantaneous water-use efficiency, and increased intercellular CO 2 concentration. The accumulation of UV-B-absorbing compounds and anthocyanins did not effectively shield plants from supplementary UV-B radiation, since the growth and photosynthetic processes were significantly reduced.Index terms: Passiflora edulis, anthocyanins, growth, phenolic compounds, photosynthesis. Sensitividade do maracujazeiro-amarelo à radiação ultravioleta-BResumo -O objetivo deste trabalho foi avaliar o efeito da radiação UV-B no crescimento vegetativo e nas características das trocas gasosas de plantas de maracujazeiro-amarelo (Passiflora edulis), cultivadas em casa de vegetação. A radiação média não ponderada de UV-B próximo ao topo das plantas foi de 8 W m -2 , para plantas tratadas com UV-B (alta UV-B), e de 0,8 W m -2 para plantas controle (baixa UV-B). As plantas foram irradiadas com UV-B por 7 horas por dia, centralizadas ao redor do meio-dia, durante 16 dias. Alta radiação de UV-B reduziu o acúmulo de matéria seca da parte aérea da planta. O conteúdo de compostos que absorvem UV-B e de antocianinas foi aumentado nas plantas expostas à alta radiação UV-B, quando comparado às plantas controle. A radiação UV-B não alterou a condutância estomática ou a taxa de transpiração, mas reduziu a fotossíntese e a eficiência instantânea do uso da água, e aumentou a concentração intercelular de CO 2 . O acúmulo de compostos que absorvem UV-B e antocianinas não protegeram de forma efetiva as plantas contra o aumento da radiação suplementar UV-B, visto que o crescimento e os processos fotossintéticos foram significativamente reduzidos.Termos para indexação: Passiflora edulis, antocianinas, crescimento, compostos fenólicos, fotossíntese.

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UV-B exposure enhances senescence of wheat leaves: modulation by photosynthetically active radiation

Cited by 21 publications

References 41 publications

Developmental phase-dependent photosynthetic responses to ultraviolet-B radiation: damage, defence, and adaptation of primary leaves of wheat seedlings

Developmental phase-dependent photosynthetic responses to ultraviolet-B radiation: damage, defence, and adaptation of primary leaves of wheat seedlings

Protecting effect of He-Ne laser on winter wheat from UV-B radiation damage by analyzing proteomic changes in leaves

Sensitivity of yellow passion fruit to ultraviolet-B radiation

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