Influence of enhanced UV-B radiation on biomass allocation and pigment concentrations in leaves and reproductive structures of greenhouse-grown Brassica rapa

Day, Thomas A.; Demchik, Sophie M.

doi:10.1007/bf00044635

Cited by 37 publications

(26 citation statements)

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“…8). Similar results were obtained with Brassica rapa [16] and Silene vulgaris [26]. Researchers using higher doses to treat sunflower and corn, report an increase in leaf thickness [21].…”

Section: Resultssupporting

confidence: 71%

“…4). In experiments with Brassica rapa where plants were treated with UV-B radiation corresponding to 16% ozone reduction no significant increase of production of UV-B absorbing compounds was found [16]; however, double doses exerted an effect. Research on the influence of enhanced UV-B on Brassica napus revealed an increase in two main groups of flavonoids kampferol and quercetin glycosids [17].…”

Section: Resultsmentioning

confidence: 90%

“…The literature reports on UV-B influences on photosynthetic pigments [18][19][20]. Sunflower and corn showed little effect of UV-B on chlorophyll content [21], as did Brassica rapa [16] and Phaseolus vulgaris [22]. In buckwheat, potential and actual photochemical efficiencies of PS II were not affected by enhanced UV-B radiation (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Growth and production of buckwheat (Fagopyrum esculentum) treated with reduced, ambient, and enhanced UV-B radiation

Gaberščik

Vončina

Trošt

et al. 2002

Journal of Photochemistry and Photobiology B: Biology

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The effect of enhanced UV-B radiation on buckwheat (Fagopyrum esculentum Moench. variety 'Darja'), an important high elevation crop, was studied in order to estimate its vulnerability in changing UV-B environment. Plants were grown in outdoor experiments from July to October under reduced and ambient UV-B levels, and an UV-B level simulating 17% ozone depletion in Ljubljana. During the development the following parameters were monitored: light saturated photosynthetic activity, transpiration, potential and effective photochemical efficiencies of photosystem II, the contents of photosynthetic pigments and methanol soluble UV-B absorbing compounds. At the end of the experiment, growth rate and production of seeds were estimated. In the following growth season the seeds collected from plants exposed to different UV-B treatments were tested for germination capacity. Total UV-B absorbing compounds during plant development were increased by UV-B radiation, photosynthetic pigments (chlorophyll a and b and carotenoids) decreased. Photosynthetic rate was lowered in an early stage of development. UV-B treatment resulted in the increase in the transpiration rate and consequently the decrease in water use efficiency (WUE). The disturbances in water economy and in photosynthesis affected the reproduction potential negatively; the production of seeds in plants cultivated under ambient and enhanced UV-B was 57 and 39% of the production of specimens treated with reduced UV-B, respectively. The germination of seeds collected from treated plants revealed on average about 95% success, independently of the treatment, but the time needed for germination was the shortest for seeds developed under enhanced UV-B level treatment. Enhanced UV-B radiation affected water relations and production of buckwheat, but not the potential of seeds for germination.

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“…8). Similar results were obtained with Brassica rapa [16] and Silene vulgaris [26]. Researchers using higher doses to treat sunflower and corn, report an increase in leaf thickness [21].…”

Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 90%

See 1 more Smart Citation

Growth and production of buckwheat (Fagopyrum esculentum) treated with reduced, ambient, and enhanced UV-B radiation

Gaberščik

Vončina

Trošt

et al. 2002

Journal of Photochemistry and Photobiology B: Biology

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“…Other authors (BiancoColomas and Hugues, 1990;Rudat and Göring, 1995) have already described positive effects of kinetin on betacyanin synthesis for both white light and UV-A . UV-B radiation frequently alters pigments concentration as, for instance, chlorophylls (Day and Demchik, 1996) and also modifies plant development due to its deleterious effects on chromophores associated to photosynthesis (Caldwell et al, 1995). In MS, MS + kinetin and MS + tyrosine media, the Chl a/ Chl b ratio decreased after inclusion of additional UV-A (Table 2).…”

Section: Discussionmentioning

confidence: 99%

Developmental effects of additional ultraviolet a radiation, growth regulators and tyrosine in Alternanthera brasiliana (L.) Kuntze cultured in vitro

Silva

Macedo

Lage

et al. 2005

Braz. arch. biol. technol.

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“…The concentration of chlorophyll a+b and the total concentration of carotenoids were calculated according to Lichtenthaler and Wellburn (1983). The amount of UV-Babsorbing compounds was estimated in fresh leaf tissue by measuring the absorbance at 300 nm in acidified methanol solutions (Day and Demchik, 1996). Total phenols were measured colorimetrically in ethanol extracts of ground dried leaves, using the Folin-Ciocalteu method (Amorim et al, 1977); values were standardized against chlorogenic acid.…”

Section: Organic Compounds Affected By Metals and Leaf Specific Massmentioning

confidence: 99%

The effect of lead on the phytochemistry of Tithonia diversifolia exposed to roadside automotive pollution or grown in pots of Pb-supplemented soil

Olivares

2003

Braz. J. Plant Physiol.

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Tithonia diversifolia, a ruderal weedy species utilized in agroforestry, is widely distributed in the tropics, often being found in wasteland, margins of polluted city rivers and roadsides. The objective of this study was to compare plants sampled at a light and heavy traffic roadside for metal concentration and foliar compounds which may be related to senescence and/or detoxification of metals. The field survey was followed by an experiment in pots of Pb-acetate-supplemented soil to verify if the same response is obtained under controlled conditions with regard to Pb. The concentration of Pb in leaves and roots of plants sampled at a heavy traffic roadside was higher than in samples from a light traffic site. The content of Cr, Al, Fe, Cu and Ni was also higher in leaves but not of roots in plants from the polluted site. No significant differences were found in the concentrations of chlorophyll, carotenoids, UV-absorbing compounds and proteins, nor in the chlorophyll a/b ratio and lipid peroxidation of leaves collected at both sites. On the other hand, Pb-contaminated leaves and roots showed higher acid phosphatase activity while the foliar nitrate reductase activity and specific leaf mass were lower. An increase of leaf phenol concentration, thought to be involved in the detoxification of metals, was observed in the polluted field plants and in roots in the pot experiment, where Pb-acetate was supplied to the soil, but the changes observed in acid phosphatase and specific leaf mass in the field were not found in the pot experiment.Key words: Asteraceae, metals, Mexican sunflower, phenols, pollution, weeds.Efeito do chumbo na fitoquímica de Tithonia diversifolia exposta à poluição de rodovia ou crescidas em solo suplementado com chumbo: Tithonia diversifolia, uma espécie ruderal utilizada em sistemas agroflorestais, amplamente distribuída nos trópicos, é freqüentemente encontrada em locais de descarte, margens de rios poluídos próximos a cidades e ao longo de rodovias. O objetivo deste estudo foi comparar plantas coletadas de rodovias com pouco e com intenso tráfego em relação à concentração de metais e compostos foliares que podem estar relacionados à senescência e/ou à destoxificação de metais. Também fez-se um experimento com vasos contendo solo suplementado com chumbo para verificar se a mesma resposta é obtida sob condições controladas usando esse metal. A concentração de Pb nas folhas e raízes de plantas amostradas em rodovia de tráfego intenso foi maior que nas amostras de rodovia de pouco tráfego. As concentrações de Cr, Al, Fe, Cu e Ni foram maiores nas folhas, mas não nas raízes de plantas da rodovia de tráfego intenso. Não houve diferença significativa nos conteúdos de clorofila, carotenóides, compostos absorvendo no UV e proteínas, como também na razão clorofilas a/b e peroxidação de lipídeos das folhas coletadas em ambas as rodovias. Por outro lado, folhas de plantas contaminadas com Pb mostraram maior atividade de fosfatase ácida, enquanto a atividade foliar da redutase do nitrato e a massa foliar...

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Influence of enhanced UV-B radiation on biomass allocation and pigment concentrations in leaves and reproductive structures of greenhouse-grown Brassica rapa

Cited by 37 publications

References 38 publications

Growth and production of buckwheat (Fagopyrum esculentum) treated with reduced, ambient, and enhanced UV-B radiation

Growth and production of buckwheat (Fagopyrum esculentum) treated with reduced, ambient, and enhanced UV-B radiation

Developmental effects of additional ultraviolet a radiation, growth regulators and tyrosine in Alternanthera brasiliana (L.) Kuntze cultured in vitro

The effect of lead on the phytochemistry of Tithonia diversifolia exposed to roadside automotive pollution or grown in pots of Pb-supplemented soil

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