Effects of Ultraviolet-B Radiation on Needle Anatomy and Morphology of Western Larch, Interior Spruce and Lodgepole Pine

Król, Paulina; Ormrod, D. P.; Binder, W; L’Hirondelle, Sylvia J.

doi:10.1300/j091v10n01_16

Cited by 7 publications

(7 citation statements)

References 6 publications

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“…However, the tolerance of P. abies to UVB‐radiation is dependent on the altitude of seed sources, and current‐year needles seem to be more vulnerable, showing changes in both phenolics and needle wax composition (Gordon et al ., ; Pukacki & Modrzyński, ; Fischbach et al ., ; Sedej & Gaberščik, ). Changes of epidermal thickness as a response to UVB‐radiation have also been reported for coniferous species (Krol et al ., ; Laakso et al ., ). If increased UVB‐radiation results in accumulation of phenolics or changes structural properties of needles, this may lead to carbon allocation away from the growth.…”

Section: Introductionmentioning

confidence: 98%

Combined effect of elevated UVB, elevated temperature and fertilization on growth, needle structure and phytochemistry of young Norway spruce (Picea abies) seedlings

Virjamo

Sutinen

Julkunen‐Tiitto

2014

Global Change Biology

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Simultaneously with warming climate, other climatic and environmental factors are also changing. Here, we investigated for the first time the effects of elevated temperature, increased ultraviolet-B (UVB) radiation, fertilization and all combinations of these on the growth, secondary chemistry and needle structure of 1-year-old Norway spruce (Picea abies (L.) Karst.) seedlings in an outdoor experiment. After one growing season, elevated temperature increased root : shoot ratio and concentrations of needle piperidine alkaloids, while concentrations of needle catechins and acetophenones and bark flavonoids decreased compared with ambient temperature seedlings. UVB-radiation increased concentrations of bark condensed tannins, while fertilization increased total biomass and concentrations of needle catechins. In addition to the main effects, concentrations of some individual phenolic compounds showed UV × temperature or UV × temperature × fertilization interactions, and fertilization modified temperature response on root : shoot ratio. All the treatments described here affected the defence chemistry profiles of the seedlings, which may imply some changes in plant-herbivore interactions in connection with changing climate. The interactions between treatments indicate a need for further experiments involving several simultaneously affecting environmental changes.

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Section: Introductionmentioning

confidence: 98%

Combined effect of elevated UVB, elevated temperature and fertilization on growth, needle structure and phytochemistry of young Norway spruce (Picea abies) seedlings

Virjamo

Sutinen

Julkunen‐Tiitto

2014

Global Change Biology

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“…Many plant species have been adversely affected by increased UV-B exposure (Deckmyn et al 2001); however, some research indicates exposure to UV-B levels above ambient actually enhances plant growth (Deckmyn and Impens 1998;Stepanou and Manetas 1998) while other research found that eliminating UV-B exposure stimulates biomass production (Bogenrieder and Klien 1982). UV-B exposure has been found to reduce seedling biomass and height Teramura 1989, 1992;Naidu et al 1993;Poulson et al 2002), to result in leaf curling (Krol et al 2000) and increased leaf thickness and width (Sullivan et al 1996), and increases stomatal frequency while decreasing photosynthetic capacity (Stewart and Hoddinott 1993).…”

Section: Introductionmentioning

confidence: 99%

Root Porosity Changes in Salix nigra Cuttings in Response to Copper and Ultraviolet-B Radiation Exposure

Baud

Pezeshki

2011

Water Air Soil Pollut

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“…Em Brassica napus L., o enrolamento está associado com a degradação da auxina na epiderme da face adaxial ou ainda, devido aos danos que a radiação causa às proteínas, ao DNA ou aos fotossistemas durante o desenvolvimento foliar (Wilson & Greenberg 1993;Krol et al 2000). O enrolamento das margens pode ser considerado como um mecanismo fotoprotetor das folhas para minimizar o efeito da radiação UV-B, uma vez que a área foliar exposta é menor.…”

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Efeitos da radiação ultravioleta-B sobre a morfologia foliar de Arabidopsis thaliana (L.) Heynh. (Brassicaceae)

Boeger

Poulson

2006

Acta Bot. Bras.

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RESUMO -(Efeitos da radiação ultravioleta-B sobre a morfologia foliar de Arabidopsis thaliana (L.) Heynh. (Brassicaceae)). A redução da camada de ozônio resulta no aumento da radiação ultravioleta que atinge a superfície terrestre, especialmente a radiação ultravioleta-B (UV-B). O aumento da radiação poderá induzir a mudanças estruturais e fisiológicas nas plantas, influenciando no seu crescimento e desenvolvimento. O objetivo deste trabalho foi determinar os efeitos da radiação UV-B ambiente sobre a morfologia das folhas de Arabidopsis thaliana desenvolvidas em condições controladas. As sementes de A. thaliana cresceram em câmaras de crescimento, com 300 µmol m -2 s -1 de radiação fotossinteticamente ativa (PAR) com ou sem 6 kJ m -2 s -1 de radiação UV-B be (UV-B be ; UV-B biologicamente efetiva). Após 21 dias, 10 folhas de cada tratamento (com e sem radiação UV-B) foram coletadas para avaliar área foliar, massa fresca e seca, AEF, densidades estomáticas e de tricomas de ambas as faces da folha, espessura da lâmina foliar e concentração de compostos fenólicos e de clorofila total, a e b. As folhas tratadas com radiação UV-B apresentaram menor área foliar, massa fresca e seca, densidade de tricomas na face adaxial e densidade de estômatos na face abaxial da folha. Entretanto, apresentaram os maiores valores médios de espessura total da lâmina e do mesofilo, maior concentração de clorofila total, clorofila a e clorofila b e compostos fenólicos foliares do que as folhas não tratadas com radiação UV-B. Essas diferenças morfológicas significativas (p < 0,05) entre as folhas tratadas e não tratadas com radiação UV-B indicam que A. thaliana é sensível à radiação e possui mecanismos para minimizar os seus efeitos negativos sobre o desenvolvimento e crescimento foliar. Entretanto, as respostas da planta à radiação UV-B envolvem vários mecanismos fisiológicos que ainda necessitam de investigações mais detalhadas. Palavras-chave : Arabidopsis thaliana, radiação UV-B, morfologia foliar, compostos fenólicos ABSTRACT -(Effects of ultraviolet-B radiation on leaf morphology of Arabidopsis thaliana (L.) Heynh. (Brassicaceae)). Reduction of the ozone layer results in the increase in ultraviolet radiation reaching the earth's surface, especially the ultraviolet-B (UV-B). The increase of radiation may induce structural and physiological changes in plants, influencing their growth and development. This paper evaluates the effects of ambient UV-B radiation upon to the leaf morphology of Arabidopsis thaliana developed under controlled conditions. The seeds of A. thaliana grown in environmental chamber, with 300 µmol m -2 s -1 de photosynthetically active radiation (PAR) with and without 6 kJ m -2 s -1 of radiation UV-B be (UV-B be ; UV-B biologically effective). After 21 days, ten leaves of each treatment (with and without UV-B radiation) were collected to measure leaf area, fresh and dry mass, AEF, stomata and trichome densities of both leaf surfaces, leaf thickness and concentration of phenolic compounds and total chlorophyll, and ...

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Effects of Ultraviolet-B Radiation on Needle Anatomy and Morphology of Western Larch, Interior Spruce and Lodgepole Pine

Cited by 7 publications

References 6 publications

Combined effect of elevated UVB, elevated temperature and fertilization on growth, needle structure and phytochemistry of young Norway spruce (Picea abies) seedlings

Combined effect of elevated UVB, elevated temperature and fertilization on growth, needle structure and phytochemistry of young Norway spruce (Picea abies) seedlings

Root Porosity Changes in Salix nigra Cuttings in Response to Copper and Ultraviolet-B Radiation Exposure

Efeitos da radiação ultravioleta-B sobre a morfologia foliar de Arabidopsis thaliana (L.) Heynh. (Brassicaceae)

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