Seasonal trends in reduced leaf gas exchange and ozone-induced foliar injury in three ozone sensitive woody plant species

Novak, K.; Schaub, Marcus; Fuhrer, Jürg; Skelly, J. M.; Hug, Christian; Landolt, W.; Bleuler, P.; Kräuchi, Norbert

doi:10.1016/j.envpol.2004.12.018

Cited by 80 publications

(63 citation statements)

References 29 publications

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“…The reduction in photosynthesis rate by O 3 could be attributed to stomatal closure, decreased chlorophyll content and electron transport rate, impaired carboxylation capacity and Rubisco content (Paoletti et al, 2009;Reich, 1983). Although the reduction in Rubisco activity was assumed to be the primary cause in photosynthetic decline under O 3 stress, stoma appeared to an important factor controlling O 3 entering the leaf interior (Novak et al, 2005). Therefore, the response of stomatal conductance (g s ) to O 3 at different leaf ages could influence the stomatal O 3 uptake and further leaf tissue injury.…”

Section: Introductionmentioning

confidence: 99%

“…For hybrid poplar and Aspen, elevated O 3 concentrations altered the patterns of change in leaf area, photosynthetic rate and carbon gain with leaf position from root to apex and the older leaves were more sensitive to O 3 than younger leaves (Bagard et al, 2008;Greitner et al, 1994). At the canopy level, ambient O 3 concentrations caused reductions in both light-saturated photosynthesis rate (A sat ) and g s of the lower canopy that were about 30% more than those of the upper canopy in black poplar (Populus nigra L.) species (Novak et al, 2005). Young poplar trees also showed that reduced photosynthetic parameters related to chlorophyll content, maximum rate of photosynthetic electron transport and net photosynthetic assimilation appeared only on fully expanded leaves, but not on young and undeveloped leaves, which was partly attributed to differences in leaf anatomy between expanding and fully expanded leaves (Bagard et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Elevated ozone negatively affects photosynthesis of current-year leaves but not previous-year leaves in evergreen Cyclobalanopsis glauca seedlings

Zhang

Zhu

Wang

et al. 2014

Environmental Pollution

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Elevated ozone negatively affects photosynthesis of current-year leaves but not previous-year leaves in evergreen Cyclobalanopsis glauca seedlings

Zhang

Zhu

Wang

et al. 2014

Environmental Pollution

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“…There are 53 species of poplar distributed in 22 provinces of China (not including crossbreed and imported species), covering a total area of over 10 million ha with a total standing stock of 426 million m 3 (Liang et al, 2006;Xu et al, 2009). Different species or clones of poplar have shown different sensitivity to O 3 with respect to visible leaf injury (Hoshika et al, 2012;Novak et al, 2005;Ryan et al, 2009;Strohm et al, 1998), damaged photosystems (Bernacchi et al, 2003;Guidi et al, 2001;Ranieri et al, 2001), and reduced growth (Isebrands et al, 2001;Matyssek et al, 1993;Mooi, 1980). However, the knowledge of O 3 doseeresponse relationships for poplar, which could be an effective tool for O 3 risk assessment, is still limited.…”

Section: Introductionmentioning

confidence: 99%

Concentration- and flux-based ozone dose–response relationships for five poplar clones grown in North China

Dearn

Gao

Yue

et al. 2015

Environmental Pollution

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a b s t r a c tConcentration-and flux-based O 3 doseeresponse relationships were developed for poplars in China. Stomatal conductance (g s ) of five poplar clones was measured to parameterize a Jarvis-type multiplicative g s model. The maximum g s and other model parameters varied between clones. The strongest relationship between stomatal O 3 flux and total biomass was obtained when phytotoxic ozone dose (POD) was integrated using an uptake rate threshold of 7 nmol m À2 s À1 . The R 2 value was similar between flux-based and concentration-based doseeresponse relationships. Ozone concentrations above 28 e36 nmol mol À1 contributed to reducing the biomass production of poplar. Critical levels of AOT 40 (accumulated O 3 exposure over 40 nmol mol À1 ) and POD 7 in relation to 5% reduction in total biomass for poplar were 12 mmol mol À1 h and 3.8 mmol m À2 , respectively.

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“…Já Castagna et al (2001) consideram que, em folhas maduras, a queda em g s está relacionada à redução da eficiência da carboxilação, não sendo a causa primária da queda na A l . Novak et al (2005), trabalhando com três espécies arbóreas sensíveis ao O 3 , verificaram que as maiores reduções nas trocas gasosas ocorreram nas folhas que apresentavam sintomas foliares visíveis, como foi verificado no presente estudo, em que as folhas das plantas mantidas sob ar filtrado apresentaram-se íntegras e com taxas de A l mais elevadas, enquanto as de AF+O 3 tinham danos e A l reduzida.…”

Section: Discussionunclassified

“…Castagna et al (2001), em testes com Cucurbita pepo L., mostraram que a redução na quantidade de β-caroteno causada pelo O 3 desestabilizou o fotossistema II (PSII). Ainda, Novak et al (2005) apontaram uma estreita relação entre injúrias foliares e queda na fotossíntese em três espécies lenhosas.…”

Section: Introductionunclassified

Avaliação da sensibilidade de plantas jovens de quiabo (Abelmoschus esculentus (L.) Moench. - Malvaceae) ao ozônio

Bulbovas

Sant'Anna

Moraes

et al. 2008

Hoehnea

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-(Assessment of the sensitivity of okra (Abelmoschus esculentus (L.) Moench. -Malvaceae) to ozone). The sensitivity of Abelmoschus esculentus to ozone (O 3 ) was assessed in plants exposed during four days, six hours/day, to filtered air (AF) and to AF plus 80 ppb of O 3 (AF+O 3 ) into fumigation chambers, by determining visible leaf symptoms and changes on gas exchange and on antioxidants. Visible symptoms were daily evaluated. Gas exchange and antioxidants (ascorbic acid and superoxide dismutase) were analyzed at the end of the experiment. All plants from AF+O 3 treatment showed leaf injury, characterized by interveinal reddish punctuations on the adaxial surfaces. In average, 15% of leaf injury index and 62% of severity were estimated. Net photosynthesis, stomatal conductance, transpiration rate, ascorbic acid level and superoxide dismutase activity were significantly reduced in those plants, compared to measurements performed in plants exposed to AF only. The results suggest that Abelmoschus esculentus is sensitive to ozone, showing low levels of antixidative defenses and physiological distubances. Key words: Abelmoschus esculentus, antioxidants, gas exchange, ozone, visible foliar symptoms RESUMO -(Avaliação da sensibilidade de plantas jovens de quiabo (Abelmoschus esculentus (L.) Moench. -Malvaceae) ao ozônio). A sensibilidade de Abelmoschus esculentus ao ozônio (O 3 ) foi determinada em plantas expostas por quatro dias, seis horas/dia, ao ar filtrado (AF) e ao AF enriquecido com 80 ppb de O 3 (AF+O 3 ), em câmaras de fumigação, analisando-se sintomas foliares visíveis e alterações nas trocas gasosas e em antioxidantes. Avaliaram-se os sintomas foliares diariamente e as trocas gasosas e antioxidantes (ácido ascórbico e superóxido dismutase) ao fim do experimento. Todas as plantas em AF+O 3 apresentaram sintomas foliares, caracterizados por pontuações avermelhadas na superfície adaxial, entre as nervuras. Em média, o índice de injúria foliar foi de 15% e a severidade de 62%. Fotossíntese líquida, condutância estomática, transpiração, concentração de ácido ascórbico e atividade da superóxido dismutase foram reduzidas significativamente nestas plantas, em comparação com as mantidas sob ar filtrado. Os resultados sugerem que Abelmoschus esculentus é sensível ao O 3 , apresentando baixos níveis de defesas antioxidativas e distúrbios fisiológicos.

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Seasonal trends in reduced leaf gas exchange and ozone-induced foliar injury in three ozone sensitive woody plant species

Cited by 80 publications

References 29 publications

Elevated ozone negatively affects photosynthesis of current-year leaves but not previous-year leaves in evergreen Cyclobalanopsis glauca seedlings

Elevated ozone negatively affects photosynthesis of current-year leaves but not previous-year leaves in evergreen Cyclobalanopsis glauca seedlings

Concentration- and flux-based ozone dose–response relationships for five poplar clones grown in North China

Avaliação da sensibilidade de plantas jovens de quiabo (Abelmoschus esculentus (L.) Moench. - Malvaceae) ao ozônio

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