Non-photosynthetic mechanisms of growth reduction in pea (Pisum sativum L.) exposed to UV-B radiation

González, Raquel Luengo; Mepsted, R.; Wellburn, A. R.; Paul, Nigel D.

doi:10.1046/j.1365-3040.1998.00243.x

Cited by 68 publications

(53 citation statements)

References 31 publications

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“…For example, fresh and dry weight, and leaf area were reduced under UV-B only at early development stages in maize (MARK et al, 1996). The lack of an UV-B effect on biomass production in the present study may be a consequence of developmental stage at which the stress was imposed as reported by GONZÁLEZ et al (1998). Increase in leaf thickeness has often been reported in response to UV-B radiation (DAY et al, 1993;LIU et al, 2005) and this response may reduces the UV-B damage.…”

Section: Resultsmentioning

confidence: 45%

Growth and physiological responses of sunflower plants exposed to ultraviolet-B radiation

2007

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Section: Resultsmentioning

confidence: 45%

Growth and physiological responses of sunflower plants exposed to ultraviolet-B radiation

2007

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“…This decrease in the DEZ size correlates with a decrease in GA concentration by UV-B in this zone, which is regulated by the expression of GRF1 and possibly other transcription factors of the GRF family. UV-B also has been shown to inhibit cell expansion in several species (Gonzalez et al, 1998;Ruhland and Day, 2000;Ruhland et al, 2005;Wargent et al, 2009). In our experiments, the decrease in final leaf length and in leaf elongation rate in steady-state growth is not due to the reduction of mature cell size.…”

Section: Discussionmentioning

confidence: 99%

“…Acute, stress-inducing UV-B conditions usually inhibit cell proliferation, while both cell proliferation and expansion are affected by lower doses and/or chronic UV-B treatments (Staxen and Bornman, 1994;Nogués et al, 1998;Laakso et al, 2000;Hopkins et al, 2002;Hofmann et al, 2003;Kakani et al, 2003;Hectors et al, 2007Hectors et al, , 2010Wargent et al, 2009;Robson and Aphalo, 2012). For example, the number of epidermal cells at maturity decreased after UV-B exposure in some species (Gonzalez et al, 1998;Hopkins et al, 2002); on the contrary, in lettuce (Lactuca sativa) leaves, UV-B reduced cell expansion rate and final leaf size (Wargent et al, 2009). In Arabidopsis, a number of UV-induced morphological changes have been described, including decreases in rosette diameter and inflorescence height (Hectors et al, 2007).…”

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UV-B Inhibits Leaf Growth through Changes in Growth Regulating Factors and Gibberellin Levels

et al. 2017

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Ultraviolet-B (UV-B) radiation affects leaf growth in a wide range of species. In this work, we demonstrate that UV-B levels present in solar radiation inhibit maize (Zea mays) leaf growth without causing any other visible stress symptoms, including the accumulation of DNA damage. We conducted kinematic analyses of cell division and expansion to understand the impact of UV-B radiation on these cellular processes. Our results demonstrate that the decrease in leaf growth in UV-B-irradiated leaves is a consequence of a reduction in cell production and a shortened growth zone (GZ). To determine the molecular pathways involved in UV-B inhibition of leaf growth, we performed RNA sequencing on isolated GZ tissues of control and UV-B-exposed plants. Our results show a link between the observed leaf growth inhibition and the expression of specific cell cycle and developmental genes, including growth-regulating factors (GRFs) and transcripts for proteins participating in different hormone pathways. Interestingly, the decrease in the GZ size correlates with a decrease in the concentration of GA19, the immediate precursor of the active gibberellin, GA1, by UV-B in this zone, which is regulated, at least in part, by the expression of GRF1 and possibly other transcription factors of the GRF family.

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“…As variações estruturais e bioquímicas observadas em A. thaliana sob a ação da radiação UV-B indicam que a espécie é sensível a esta forma de radiação, como várias dicotiledôneas herbáceas (Day 1993;Gonzalez et al 1998;Hao et al 2000). Os menores valores médios de área foliar, massa fresca, massa seca e conteúdo de água encontrados nas folhas tratadas com UV-B, também foram reportados para outras espécies (Correia et al 1998;Poulson et al 2002) e podem ser explicados como uma reação ao estresse provocado pela radiação nos processos de desenvolvimento e do metabolismo das plantas (Wellman 1983).…”

Section: Discussionunclassified

“…Os menores valores de área foliar para as plantas expostas a radiação, também podem ser entendidos como um mecanismo de proteção em função da redução do tamanho ou número de células (Gonzalez et al 1998) ou ajustes na estrutura da folha (Tevini et al 1983). A radiação UV-B exerce efeitos negativos sobre a divisão celular, o que também poderia resultar na menor área foliar .…”

Section: Discussionunclassified

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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Non-photosynthetic mechanisms of growth reduction in pea (Pisum sativum L.) exposed to UV-B radiation

Cited by 68 publications

References 31 publications

Growth and physiological responses of sunflower plants exposed to ultraviolet-B radiation

Growth and physiological responses of sunflower plants exposed to ultraviolet-B radiation

UV-B Inhibits Leaf Growth through Changes in Growth Regulating Factors and Gibberellin Levels

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

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