Effect of ultraviolet-B radiation in laboratory on morphological and ultrastructural characteristics and physiological parameters of selected cultivar of Oryza sativa L.

Almeida, Sérgio Luiz de; Schmidt, Éder C.; Pereira, Débora Tomazi; Kreusch, Marianne; Felix, Marthiellen R. de L.; Osorio, Luz K.P.; Martins, Roberta de Paula; Latini, Alexandra; Ramlov, Fernanda; Chow, Fungyi; Maraschin, Marcelo; Rodrigues, Ana Cláudia; Bouzon, Zenilda L.

doi:10.1007/s00709-013-0512-0

Cited by 7 publications

(11 citation statements)

References 45 publications

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“…This indicates that they were used as photoprotective agents. These same results were observed in Oryza sativa L. and S. cymosum . The total amount of carotenoids was higher for the point 1 samples compared to the point 2 samples, and this may be related to the amount of nutrients in seawater.…”

Section: Discussionsupporting

confidence: 79%

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Effects of Ultraviolet Radiation (UV‐A+UV‐B) on the Antioxidant Metabolism of the Red Macroalga Species Acanthophora spicifera (Rhodophyta, Ceramiales) From Different Salinity and Nutrient Conditions

Pereira

Fonseca

et al. 2019

Photochem & Photobiology

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Acanthophora spicifera (M.Vahl) Børgesen is a macroalga of great economic importance. This study evaluated the antioxidant responses of two algal populations of A. spicifera adapted to different abiotic conditions when exposed to ultraviolet-A+ultraviolet-B radiation (UV-A+UV-B). Experiments were performed using the water at two collection points for 7 days of acclimatization and 7 days of exposure to UVR (3 h per day), followed by metabolic analyses. At point 1, water of 30 AE 1 practical salinity unit (psu) had concentrations of 1.06 AE 0.27 mM NH þ 4 , 8.47 AE 0.01 mM NO À 3 , 0.17 AE 0.01 mM PO À3 4 and pH 7.88. At point 2, water of 35 AE 1 psu had concentrations of 1.13 AE 0.05 mM NH þ 4 , 3.73 AE 0.01 mM NO À 3 , 0.52 AE 0.01 mM PO À3 4and pH 8.55. Chlorophyll a, phycobiliproteins, carotenoids, mycosporins, polyphenolics and antioxidant enzymes (catalase, superoxide dismutase and guaiacol peroxidase) were evaluated. The present study demonstrates that ultraviolet radiation triggers antioxidant activity in the A. spicifera. However, such activation resulted in greater responses in samples of the point 1, with lower salinity and highest concentration of nutrients.

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Section: Discussionsupporting

confidence: 79%

“…Acrostichum danaeifolium Langsd. & Fisch , O. sativa and S. cymosum were all exposed to UVR and also showed an increase in phenolic compounds. On the other hand, the highest salinity (point 2) has had the highest concentrations of phenolics.…”

Section: Discussionmentioning

confidence: 96%

Effects of Ultraviolet Radiation (UV‐A+UV‐B) on the Antioxidant Metabolism of the Red Macroalga Species Acanthophora spicifera (Rhodophyta, Ceramiales) From Different Salinity and Nutrient Conditions

Pereira

Fonseca

et al. 2019

Photochem & Photobiology

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“…Increasing the duration of UV treatment to 60 min increased the accumulation of secondary metabolites and leaf thickness (Jansen 2002;Victório et al 2011). In our work, and after a daily dose of 90 min, plants were severely damaged showing altered leaf morphology, coincident with findings of Almeida et al (2013) in Oryza sativa plants after UV-B exposure.…”

Section: Discussionsupporting

confidence: 73%

“…However, the majority of studies have focused on UV-B, which is known to inhibit photosynthetic activity, promote leaf thickening and negatively affect leaf area mainly in the epidermis of the adaxial side of the leaf (Jansen 2002). Moreover, UV-B radiation promotes changes in the mesophyll in order to protect the photosynthetic mechanisms, as well as activates the stress routes and therefore the accumulation of plant defense-related secondary metabolites (Almeida et al 2013;González et al 2009;Jansen 2002;Jayakumar et al 2003;Neugart and Schreiner 2018;Paul et al 2012;Rozema et al 1997). This defense has been associated with increased accumulation of anti-nutritive defensive proteins, thus indirectly reducing the palatability of plants for insects (Izaguirre et al 2007;Demukra et al 2010;Mewis et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…This defense has been associated with increased accumulation of anti-nutritive defensive proteins, thus indirectly reducing the palatability of plants for insects (Izaguirre et al 2007;Demukra et al 2010;Mewis et al 2012). Photomorphogenesis plant responses to UV-B reduce the ability of arthropods to effectively feed or reproduce (Almeida et al 2013;Vänninen et al 2010). UV radiation is also known to play a major role in arthropod behavior, having a direct impact, modifying their migration patterns, take off and host plant finding ability, settlement, feeding behavior or their life cycle (Ben-Yakir and Fereres 2016; Johansen et al 2011; Raviv and Antignus 2004).…”

Section: Introductionmentioning

confidence: 99%

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Supplementary UV radiation on eggplants indirectly deters Bemisia tabaci settlement without altering the predatory orientation of their biological control agents Nesidiocoris tenuis and Sphaerophoria rueppellii

et al. 2019

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Ultraviolet (UV) radiation that reaches the earth surface has increased substantially in the past decades, altering insect-plant interactions by directly affecting herbivores behavior or indirectly by modifying plant chemistry and morphogenesis. We evaluated the indirect effect of supplementary UV radiation under glasshouse conditions on Bemisia tabaci settlement, eggplant (Solanum melongena L.) production and its effects on the flight activity of Nesidiocoris tenuis and Sphaerophoria rueppellii. Eggplants were daily radiated with different supplemental UV treatments, A +/B +, A −/B + or A −/B −, during 30, 60 or 90 min for 21 days. The whitefly settlement was assessed immediately after the UV treatments or after 18 extra days on plants kept under regular glasshouse conditions with no further supplemental UV radiation. The number of whitefly settled on plants was counted after 2, 6, 24 and 48 h. Supplementary UV radiation reduced whitefly settlement for all exposure times with alterations on the morphology and increased nitrogen and amino acid content of eggplants, mainly after 90 min of UV radiation exposition. When plants were allowed to recover under regular light conditions, growth traits were similar, and whiteflies showed no preference. Fruit parameters were not negatively altered by supplementary UV radiation. Natural enemy captures per sticky trap were more abundant under A −/B + and A +/B + conditions; however, indirect host preference tests indicated no differences among treatments. In conclusion, supplementary UV radiation could be used to reduce whitefly infestation in glasshouses at the early stages of plant development without detrimental effects on crop yield or beneficial orientation.

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Temporal dynamics of ROS biogenesis under simulated solar radiation in the cyanobacterium Anabaena variabilis PCC 7937

et al. 2014

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We studied the temporal generation of reactive oxygen species (ROS) in the cyanobacterium Anabaena variabilis PCC 7937 under simulated solar radiation using WG 280, WG 295, WG 305, WG 320, WG 335, WG 345, and GG 400 nm cut-off filters to find out the minimum exposure time and most effective region of the solar spectrum inducing highest level of ROS. There was no significant generation of ROS in all treatments in comparison to the samples kept in the dark during the first 8 h of exposure; however, after 12 h of exposure, ROS were significantly generated in samples covered with 305, 295, or 280 nm cut-off filters. In contrast with ROS, the fragmentation of filaments was predominantly seen in 280 nm cut-off filter covered samples after 12 h of exposure. After 24 h of exposure, ROS levels were significantly higher in all samples than in the dark; however, the ROS signals were more pronounced in 320, 305, 295, or 280 nm cut-off filter covered samples. In contrast, the length of filaments was reduced in 305, 295, or 280 nm cut-off filter covered samples after 24 h of exposure. Thus, fragmentation of the filament was induced by all wavelengths of the UV-B region contrary to the UV-A region where only shorter wavelengths were able to induce the fragmentation. In contrast, ROS were generated by all wavelengths of the solar spectrum after 24 h of exposure; however, shorter wavelengths of both the UV-A and the UV-B regions were more effective in generating ROS in comparison to their higher wavelengths and photosynthetic active radiation (PAR). Moreover, lower wavelengths of UV-B were more efficient than the lower wavelengths of the UV-A radiation. Findings from this study suggest that certain threshold levels of ROS are required to induce the fragmentation of filaments.

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Effect of ultraviolet-B radiation in laboratory on morphological and ultrastructural characteristics and physiological parameters of selected cultivar of Oryza sativa L.

Cited by 7 publications

References 45 publications

Effects of Ultraviolet Radiation (UV‐A+UV‐B) on the Antioxidant Metabolism of the Red Macroalga Species Acanthophora spicifera (Rhodophyta, Ceramiales) From Different Salinity and Nutrient Conditions

Effects of Ultraviolet Radiation (UV‐A+UV‐B) on the Antioxidant Metabolism of the Red Macroalga Species Acanthophora spicifera (Rhodophyta, Ceramiales) From Different Salinity and Nutrient Conditions

Supplementary UV radiation on eggplants indirectly deters Bemisia tabaci settlement without altering the predatory orientation of their biological control agents Nesidiocoris tenuis and Sphaerophoria rueppellii

Temporal dynamics of ROS biogenesis under simulated solar radiation in the cyanobacterium Anabaena variabilis PCC 7937

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