Leaves of Citrus aurantifolia exhibit a different sensibility to solar UV-B radiation according to development stage in relation to photosynthetic pigments and UV-B absorbing compounds production

Ibañez, Silvina; Rosa, Mariana; Hilal, Mirna; González, Juan Antonio Suarez; Prado, Fernando Eduardo

doi:10.1016/j.jphotobiol.2008.01.002

Cited by 47 publications

(20 citation statements)

References 35 publications

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“…Passion fruit plants grown under high UV-B radiation had a 32% increase in anthocyanin concentration in comparison to the control plants ( Figure 1B). This result differs from those of other research, which showed that UVB radiation did not increase anthocyanin concentration (Ibañez et al, 2008). In the present study, the increase in UV-B absorbing compounds and anthocyanins indicates that passion fruit plants may activate a defense mechanism against the radiation harmful effect.…”

Section: Resultscontrasting

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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Section: Resultscontrasting

confidence: 99%

Sensitivity of yellow passion fruit to ultraviolet-B radiation

Cechin¹,

Rocha²,

Fumis³

2012

Pesq. agropec. bras.

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“…We found that leaf photochemistry was more decreased in OL than in YL. Leaf age and developmental stage have already been shown to affect responses to UV-B in Brassicaceae [45] and a citrus species [46], but not in grapevine so far. The increased hydroxyl radical neutralizing capacities of YL in our experiment (Fig.6A) may contribute to preventing the lipid peroxidation observed by Berli et al [47].…”

Section: Discussionmentioning

confidence: 98%

Developmental stage is an important factor that determines the antioxidant responses of young and old grapevine leaves under UV irradiation in a green-house

Majer

Hideg

2012

Plant Physiology and Biochemistry

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“…The Chl a/b ratio significantly increased with UV-B radiation in the Korean pine needles. Chl a/b may reflect the relative ratio of stacked to unstacked regions, which are inversely proportional to the stacking degree of thylakoids (Ibañez et al 2008). Thus, an increased Chl a/b ratio may indicate that UV-B radiation causes the decomposition of the stacked regions of thylakoids (Day et al 1999).…”

Section: Discussionmentioning

confidence: 99%

Responses in the physiology and biochemistry of Korean pine (Pinus koraiensis) under supplementary UV-B radiation

Zu¹,

Wei²,

Yu³

et al. 2011

Photosynt.

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The effect of supplementary UV-B radiation on Korean pine (Pinus koraiensis Sieb. et Zucc) was investigated. Compared with the control, the T1, T2, and T3 UV-B treatments increased by 1.40, 2.81, and 4.22 kJ m -2 d -1 , respectively. Gas-exchange parameters, photosynthetic pigment concentrations, contents of secondary metabolites, epicuticular wax, free radical, malondialdehyde (MDA), and the activities of antioxidant enzymes were determined after 40 d of exposure. The concentrations of chlorophyll (Chl) a, Chl b, total Chl, carotenoid (Car), and the ratio Chl a/b in the pine needles were in the following order: T1 > T2 > T3. Compared with the control, the contents of flavonoids and epicuticular wax significantly decreased in all levels of supplementary UV-B radiations (p<0.05). Moreover, the contents of hydrogen peroxide (H 2 O 2 ) and MDA significantly increased with the enhanced UV-B radiations (p<0.05). Korean pine can increase the catalase, ascorbate peroxidase, and superoxide dismutase activities to prevent oxidative stress by supplementary UV-B radiation. However, its defence mechanism is not efficient enough to prevent UV-Binduced damage.

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Leaves of Citrus aurantifolia exhibit a different sensibility to solar UV-B radiation according to development stage in relation to photosynthetic pigments and UV-B absorbing compounds production

Cited by 47 publications

References 35 publications

Sensitivity of yellow passion fruit to ultraviolet-B radiation

Sensitivity of yellow passion fruit to ultraviolet-B radiation

Developmental stage is an important factor that determines the antioxidant responses of young and old grapevine leaves under UV irradiation in a green-house

Responses in the physiology and biochemistry of Korean pine (Pinus koraiensis) under supplementary UV-B radiation

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