Analysis of UVB values in the centre of the Iberian Peninsula

Gutiérrez-Marco, E.; Hernández, E.; Camacho, J. L.; Labajo, A.

doi:10.1016/j.atmosres.2006.09.006

Cited by 16 publications

(9 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lamps were switched on and off with no gradual transition for a photoperiod of 14 hours every day throughout the entire length of experiments. The lamps emitted no UV-C radiation and produced radiation levels representative of typical sunny summer day conditions in the centre of the Iberian Peninsula (Gutiérrez-Marco et al, 2007;Häder et al, 2007). However, it should be emphasised that our aim here was to expose plants and insects to UV-A under glasshouse conditions rather that simulate UV-A outdoors.…”

Section: Uv-a Treatmentsmentioning

confidence: 99%

Impact of UV-A radiation on the performance of aphids and whiteflies and on the leaf chemistry of their host plants

Dáder

Gwynn‐Jones

Moreno

et al. 2014

Journal of Photochemistry and Photobiology B: Biology

View full text Add to dashboard Cite

Ultraviolet (UV) radiation directly regulates a multitude of herbivore life processes, in addition to indirectly affecting insect success via changes in plant chemistry and morphogenesis. Here we looked at plant and insect (aphid and whitefly) exposure to supplemental UV-A radiation in the glasshouse environment and investigated effects on insect population growth. Glasshouse grown peppers and eggplants were grown from seed inside cages covered by novel plastic filters, one transparent and the other opaque to UV-A radiation. At a 10-true leaf stage for peppers (53 days) and 4-true leaf stage for eggplants (34 days), plants were harvested for chemical analysis and infested by aphids and whiteflies, respectively. Clip-cages were used to introduce and monitor the insect fitness and populations of the pests studied. Insect pre-reproductive period, fecundity, fertility and intrinsic rate of natural increase were assessed. Crop growth was monitored weekly for 7 and 12 weeks throughout the crop cycle of peppers and eggplants, respectively. At the end of the insect fitness experiment, plants were harvested (68 days and 18-true leaf stage for peppers, and 104 days and 12-true leaf stage for eggplants) and leaves analysed for secondary metabolites, soluble carbohydrates, amino acids, total proteins and photosynthetic pigments. Our results demonstrate for the first time, that UV-A modulates plant chemistry with implications for insect pests. Both plant species responded directly to UV-A by producing shorter stems but this effect was only significant in pepper whilst UV-A did not affect the leaf area of either species. Importantly, in pepper, the UV-A treated plants contained higher contents of secondary metabolites, leaf soluble carbohydrates, free amino acids and total content of protein. Such changes in tissue chemistry may have indirectly promoted aphid performance. For eggplants, chlorophylls a and b, and carotenoid levels decreased with supplemental UV-A over the entire crop cycle but UV-A exposure did not affect leaf secondary metabolites. However, exposure to supplemental UV-A had a detrimental effect on whitefly development, fecundity and fertility presumably not mediated by plant cues as compounds implied in pest nutrition - proteins and sugars - were unaltered.

show abstract

Section: Uv-a Treatmentsmentioning

confidence: 99%

Impact of UV-A radiation on the performance of aphids and whiteflies and on the leaf chemistry of their host plants

Dáder

Gwynn‐Jones

Moreno

et al. 2014

Journal of Photochemistry and Photobiology B: Biology

View full text Add to dashboard Cite

show abstract

“…The occurrence of this microalga at the northwest Atlantic Iberian coast shows a large intra‐annual variability but a contrasting more predictable summer/autumnal seasonality . This seasonal trend of high severity blooms follows the reduction in solar exposure from summer toward winter solstice , typical from mid to high latitude zones . This could be due to reduction in deleterious effects from excessive ultraviolet (UV) radiation.…”

Section: Introductionmentioning

confidence: 97%

Can Mycosporine‐Like Amino Acids Act as Multifunctional Compounds in Gymnodinium catenatum (Dinophyceae)?

Vale

2016

Photochem & Photobiology

View full text Add to dashboard Cite

MAAs originating from Gymnodinium catenatum were subjected to H O oxidation, light and heat. Shinorine and porphyra-334 were the more resistant to all treatments, mycosporine-glycine (MYGL) was the least resistant to oxidation and heat, whereas palythene and M-370 were the least resistant to light. MYGL and M-311 were similarly resistant to photodegradation and oxidation in the dark and low temperature, but M-311 was more resistant to oxidation under light or heat. The ratio M-370/M-365 changed from 29:1 to 6:1 ratio after 240 h of exposure to fluorescent light, indicating that M-365 could represent the M-370 cis-isomer. The role of MAAs as antioxidants and/or osmolytes was evaluated by studying effects of abrupt salinity reduction. Both increases or decreases in concentrations were observed and were dependent on the MAA initial concentration and its chemical structure. The relative increase in MAAs with a known antioxidant capacity (MYGL, palythene) followed an exponential decay trend related to initial concentration. The relative decrease in highly polar MAAs (shinorine, porphyra-334, M-332) with a suspected osmolyte role followed a rise to a maximum with the increase in initial concentration. Whether or not MAAs play a significant role in osmoregulation, their loss can occur upon hypoosmotic shock.

show abstract

“…1). The incidence of ultraviolet (UV) light in November is up to six times lower than in July at this latitude [21]. Could light exposure be another important restrictive factor for the occurrence of this microalga, after sunspots and geomagnetic perturbations?…”

Section: Introductionmentioning

confidence: 99%

“…Frequency of months with maximal PSP levels above half the EU regulatory limit and median maximal PSP levels (in lg/100 g) for the decade 2003-2012 in Aveiro lagoon mussels (from[42]); average UV-B irradiance in the center of the Iberian Peninsula (in 102 J/m 2 ) (1996-2002; from[21]). …”

mentioning

confidence: 99%

Effects of light quality and nutrient availability on accumulation of mycosporine-like amino acids in Gymnodinium catenatum (Dinophycea)

Vale

2015

Journal of Photochemistry and Photobiology B: Biology

View full text Add to dashboard Cite

Analysis of UVB values in the centre of the Iberian Peninsula

Cited by 16 publications

References 3 publications

Impact of UV-A radiation on the performance of aphids and whiteflies and on the leaf chemistry of their host plants

Impact of UV-A radiation on the performance of aphids and whiteflies and on the leaf chemistry of their host plants

Can Mycosporine‐Like Amino Acids Act as Multifunctional Compounds in Gymnodinium catenatum (Dinophyceae)?

Effects of light quality and nutrient availability on accumulation of mycosporine-like amino acids in Gymnodinium catenatum (Dinophycea)

Contact Info

Product

Resources

About