Ultraviolet Radiation and Plants: Burning Questions

Stapleton, Ann E.

doi:10.2307/3869507

Cited by 155 publications

(101 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Os compostos que absorvem a radiação UV-B alteram as propriedades ópticas das folhas, atenuando a radiação UV-B através dos tecidos foliares, reduzindo assim significativamente o potencial da radiação em danificar o DNA, que ocorre nas células do mesofilo (Day et al 1992;Day 1993;Hoque & Remus 1999). Muito dos experimentos com radiação UV-B utilizam doses altas (mais do que duas vezes as doses ambientais) (Stapleton 1992;Jordan 1996). Estudos com doses menores de radiação UV-B indicam que a mesma pode não ser prejudicial ao crescimento ou produtividade de algumas espécies e ainda pode estimular a tolerância à seca em espécies arbóreas (Poulson et al 2002).…”

Section: Introductionunclassified

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

Boeger

Poulson

2006

Acta Bot. Bras.

View full text Add to dashboard Cite

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 ...

show abstract

Section: Introductionunclassified

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

Boeger

Poulson

2006

Acta Bot. Bras.

View full text Add to dashboard Cite

show abstract

“…Investigations during the last two decades prove that UV-B radiation damages various plant processes. Such damage can be classified into two categories: damage to DNA (which can cause heritable mutations) and damage to physiological processes [1]. The main class of UV-B-induced DNA lesions consists of dimeric pyrimidine photoproducts.…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent formation and photorepair of DNA damage induced by UV-B radiation in suspension-cultured tobacco cells

Paulsson

Björn

2002

Journal of Photochemistry and Photobiology B: Biology

View full text Add to dashboard Cite

Two photoproducts of DNA damage, i.e. cyclobutane pyrimidine dimers (CPDs) and 6-4 photoproducts (6-4PPs), induced by UV-B radiation in suspension-cultured tobacco cells were quantified by enzymelinked immunosorbent assay (ELISA) with monoclonal antibodies. CPDs and 6-4PPs were induced in tobacco cells by UV-B radiation. Photorepair of CPDs was faster than that of 6-4PPs. UV-B radiation induces formation of CPDs and 6-4PPs even at 0°C, but low temperature significantly decreases the UV-Binduced (in contrast to UV-C-induced) formation of CPDs and 6-4PPs. Low temperature also retarded the removal of CPDs and 6-4PPs under white light, and almost no photorepair of CPDs and 6-4PPs was detected at 0°C. When purified DNA from tobacco cells grown in darkness was irradiated with UV-B, formation of CPDs and 6-4PPs took place at the same speed at different temperatures. It indicated that formation of CPDs and 6-4PPs induced by UV-B was temperature-independent in a non-cellular system. Based on our results for suspension-cultured tobacco cells, not only the photorepair but also UV-B-induced formation of CPDs and 6-4PPs are temperature-dependent.

show abstract

“…They are of the view that all types of UV radiations, including UV-C, affect important plant processes. These effects have been classified into two categories: DNA injuries and damages to physiological processes (Stapleton 1992). The effect of UV-C radiation on endogenous PAs has been studied in fruit tissues (Gonzalez-Aguilar et al 2004) and tobacco callus (Zacchini & de Agazio 2004).…”

Section: Ultraviolet Radiationsmentioning

confidence: 99%

Polyamines: potent modulators of plant responses to stress

Fariduddin

Varshney

Yusuf

et al. 2013

Journal of Plant Interactions

View full text Add to dashboard Cite

Polyamines (PAs) are aliphatic polycations that are widespread in living organisms. In this review, we are focusing the correlation between endogenous PA titers and physiological perturbations and on the protective role of various analogues of PAs against abiotic stresses. PAs are involved in many physiological processes, such as cell growth and development and also respond to diverse abiotic stresses. Polyamines level shifts in different ways depending on several factors, such as plant species, tolerance or sensitivity to stress, and duration of stress. Exogenously supplied PAs protected plants from abiotic stress, whereas transgenic plants overexpressing PA biosynthetic genes exhibited stress tolerance. On the other hand, loss-of-function mutant of PA biosynthetic genes, or decrease of PA titers, resulted to decrease stress tolerance.

show abstract

Ultraviolet Radiation and Plants: Burning Questions

Cited by 155 publications

References 29 publications

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

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

Temperature-dependent formation and photorepair of DNA damage induced by UV-B radiation in suspension-cultured tobacco cells

Polyamines: potent modulators of plant responses to stress

Contact Info

Product

Resources

About