Ozone uptake and its effect on photosynthetic parameters of two tobacco cultivars with contrasting ozone sensitivity

Pasqualini, Stefania; Antonielli, M.; Ederli, Luisa; Piccioni, C.; Loreto, Francesco

doi:10.1016/s0981-9428(02)01426-2

Cited by 28 publications

(21 citation statements)

References 21 publications

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“…Variable PP, an important characteristic linked to leaf protection against high intensity of light (Tuffi Santos et al, 2008), was negatively affected by the presence of the pesticide. This reduction may be due to a decrease in the growth rate of plants, since clomazone indirectly affects the photosynthetic process, causing a decrease in the availability of metabolites and hence plant growth (Pasqualini et al, 2002). However, the increase of this tissue seen in I. marginata may be linked to the deposition of the contaminant and may be an evidence of phytovolatization or phytodegradation in leaf level.…”

Section: Resultsmentioning

confidence: 99%

Structural Evaluation of Damage Caused by Herbicide Clomazone in Leaves of Arborescent Species Native to Brazil

et al. 2017

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Herbicide clomazone is highly soluble in water, which increases the risk of leaching, resulting in contamination of sources of groundwater and waterways, affecting non-target organisms, with possible degradation of riparian areas. The objective of this work was to investigate the possible anatomical modifications of the leaf tissue of twelve arborescent species native to Brazil grown in soil contaminated by clomazone, in order to microscopically characterize leaf damage caused by the herbicide, and investigate whether the structural damage precedes visible damage. Through micro morphometrics, the thickness and the area occupied by the tissues were measured in a cross section of the leaves of the forest species: adaxial and abaxial epidermis, palisade and spongy parenchyma. It has been found that the species evaluated were affected by the presence of the pesticide in the soil, and the variable with the largest negative changes was the spongy parenchyma. Among the species, Inga marginata, Schizolobium parahyba and Handroantus. serratifolius had higher tolerance to the herbicide, demonstrating potential for studies on the mechanism by which these plants exert such tolerance. Overall, the results revealed that the forest species studied demonstrate significant alterations in leaf anatomy in response to the presence of residues of herbicide clomazone in the soil, even in leaves with no visible lesions.

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Section: Resultsmentioning

confidence: 99%

Structural Evaluation of Damage Caused by Herbicide Clomazone in Leaves of Arborescent Species Native to Brazil

et al. 2017

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“…Estômatos elevados em relação às demais células epidérmicas facilitam a entrada de gases (Willmer & Fricker 1996;Fahn & Cutler 1992). As duas cultivares de N. tabacum apresentaram, nas duas superfícies, estômatos elevados em relação às demais células epidérmicas, contudo na cultivar sensível, a elevação foi mais acentuada, o que poderia levar, em parte, a diferença na sensibilidade das duas cultivares, uma vez que estômatos mais elevados facilitariam a entrada do poluente, contudo não se pode atribuir a diferença na sensibilidade diretamente à tal característica, uma vez que Pasqualini et al (2002) não encontraram diferenças na condutância estomática das duas cultivares, quando expostas ao ozônio.…”

Section: Parâmetros Anatômicosunclassified

“…Pasqualini et al (2002) Buuren et al (2002), as poliaminas, substâncias neutralizadoras de danos oxidativos, têm várias funções e, dentre elas, a proteção da planta contra agentes abióticos ou bióticos e a proteção da clorofila, preservando a eficiência do processo fotossintético. van Buuren et al (2002) observaram que a cultivar Bel-B, quando submetida ao ozônio, apresentou um rápido aumento em um tipo de poliamina, enquanto que na cultivar Bel-W3 esse aumento somente ocorreu quando as injúrias já estavam sendo formadas.…”

Section: Parâmetros Anatômicosunclassified

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Anatomia foliar comparativa das cultivares de Nicotiana tabacum L. (Solanaceae) sensível e tolerante ao ozônio

Pedroso

Alves

2008

Acta Bot. Bras.

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Recebido em 6/12/2006. Aceito em 16/04/2007 RESUMO -(Anatomia foliar comparativa das cultivares de Nicotiana tabacum L. (Solanaceae) sensível e tolerante ao ozônio). O ozônio troposférico causa necroses foliares em Nicotiana tabacum. Cultivares de tabaco são muito utilizadas como bioindicadoras de ozônio, em programas de biomonitoramento da qualidade do ar. Dentre elas destacam-se as cultivares Bel-W3 (sensível) e Bel-B (tolerante). Este estudo teve como objetivo verificar se as duas cultivares apresentam variações na estrutura foliar que possam ajudar a explicar a diferença na sensibilidade ao ozônio que ambas apresentam. Em plantas que cresceram em ambiente isento de poluentes aéreos foram coletadas folhas do terceiro nó e que foram processadas segundo técnicas usuais empregadas em anatomia vegetal. Realizaram-se análises quantitativas e qualitativas dos tecidos foliares. A cultivar Bel-W3, quando comparada à Bel-B, apresentou menor densidade estomática na superfície abaxial e maior espessura do mesofilo. Qualitativamente as células de ambas cultivares mostraram aspecto sadio, com os vacúolos ocupando praticamente todo o volume celular. A cultivar sensível apresentou visivelmente mais espaços intercelulares, câmaras estomáticas maiores e estômatos ligeiramente salientes em ambas superfícies foliares. Tais características, que facilitam a entrada e a difusão dos poluentes na folha, podem explicar, do ponto de vista estrutural, a maior sensibilidade da cultivar Bel-W3. Palavras-chave: anatomia foliar, ozônio, tabaco Bel-W3, tabaco Bel-BABSTRACT -(Comparative leaf anatomy of Nicotiana tabacum L. (Solanaceae) cultivars sensitive and tolerant to ozone). Tropospheric ozone produces symptoms such as leaf injury in Nicotiana tabacum. Tobacco cultivars are often used as ozone indicators in air-quality biomonitoring programs. Bel-W3 (sensitive) and Bel-B (tolerant) cultivars are better known. The aim of this study was to verify if the two cultivars show variation in leaf structure that may help to explain differences in ozone sensitivity. Expanded leaves from plants growing in pollutant-free air were collected, processed according to the usual techniques of plant anatomy, and analyzed quantitatively and qualitatively. The sensitive cultivar showed lower stomatal density on the abaxial leaf surface and thicker mesophyll cells when compared to the tolerant cultivar. Qualitatively speaking, both cultivars had healthy cells with unaltered vacuoles. In the sensitive cultivar, we could see more intercellular spaces, larger substomatal chambers and slightly prominent stomata on both leaf surfaces. From a structural view point, these features explain why cultivar Bel-W3 is more sensitive.

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“…Visible leaf injuries caused by ozone appeared on both sides of a sensitive cultivar (Bel W3), and were 2-3 times higher than for resistant cultivars [16,22]. In the case of resistance, defence mechanisms occur such as metabolism of plants and production of antioxidants, which protect plants against negative effects of ozone [27]. In some cases, when the ozone level is very high, visible injuries occur even on ozone-resistant tobacco leaves, although only on the upper leaf side [21,22].…”

Section: Introductionmentioning

confidence: 99%

Visible Tobacco Leaf Injury Indices as Indicators of Cumulative Tropospheric Ozone Effect

Budka¹,

Kayzer²,

Borowiak³

et al. 2014

Archives of Environmental Protection

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Abstract:Tropospheric ozone is one of the most reactive air pollutants, which causes visible injuries, as well as biomass and yield losses. The negative effect of ozone is cumulative during the growing season; hence crops are the most sensitive plants. Visible symptoms and biomass losses can cause economic losses. Tobacco plants have been recognized as one of the best bioindicators, but data on the cumulative effect of ozone on this species are limited. Results of an experiment with ozone-sensitive tobacco plants grown on sites varying in ozone concentration are presented in this paper. Two indices were used for data presentation of visible leaf injury degree. Higher solar radiation was the main cause of higher ozone concentration at the rural site. Higher tropospheric ozone concentrations were noted in 2010 in comparison to 2011, which was refl ected in visible leaf injury. Canonical variate analysis did not reveal highly signifi cant differences between sites, however, differences were observed in certain investigation periods. Moreover, higher leaf injury was noted at the rural site at the end of the experiment in both experimental years. This indicates the cumulative effect of ozone during the growing season. However, higher injury variability was noted at the urban site, even though lower ozone concentrations were noted there. Lower variability of injury at the rural site might suggest lack of infl uence of particulate matter and occurrence of higher injury even though lower ozone concentrations occurred. Better detection of ozone injury was shown by the fi rst index based on three mean values.

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Ozone uptake and its effect on photosynthetic parameters of two tobacco cultivars with contrasting ozone sensitivity

Cited by 28 publications

References 21 publications

Structural Evaluation of Damage Caused by Herbicide Clomazone in Leaves of Arborescent Species Native to Brazil

Structural Evaluation of Damage Caused by Herbicide Clomazone in Leaves of Arborescent Species Native to Brazil

Anatomia foliar comparativa das cultivares de Nicotiana tabacum L. (Solanaceae) sensível e tolerante ao ozônio

Visible Tobacco Leaf Injury Indices as Indicators of Cumulative Tropospheric Ozone Effect

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