The effects of different ozone exposures on three contrasting populations of <i>Plantago major</i>

Pearson, Samantha L.; Davison, A. W.; Reiling, Kevin; Ashenden, T.W.; Ollerenshaw, J. H.

doi:10.1111/j.1469-8137.1996.tb01869.x

Cited by 24 publications

(25 citation statements)

References 20 publications

(16 reference statements)

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“…Similarly, in both populations, the effects of ozone on stomatal conductance were greater in the low-nutrient treatment. A reduction in g s is a commonly reported effect of ozone on P. major and is likely to be independent of the effect on photosynthetic capacity (Reiling & Davison, 1995 ;Pearson et al, 1996 ;Whitfield et al, 1996). Stomatal conductance was reduced in low-nutrient plants and was further reduced with exposure to ozone.…”

Section: mentioning

confidence: 94%

“…In Bush Resistant plants, exposure to ozone increased the reproductive effort in the high-nutrient treatment, whilst in Bush Sensitive plants the converse was evident, and reproductive effort was decreased in low-nutrient plants. Increased reproductive effort might be an adaptation to stress, and has previously been documented to be altered by ozone in P. major (Pearson et al, 1996).…”

Section: mentioning

confidence: 99%

“…Resistance to ozone of populations of Plantago major varies (Reiling & Davison, 1992 b ;Pearson et al, 1996 ;Lyons, Barnes & Davison, 1997) ; the variation shows a significant positive correlation with the ozone exposure index at the location of each population (Reiling & Davison, 1992 b ;Lyons et al, 1997). It is possible that current ambient ozone levels have led to evolution of resistance (Davison & Barnes, 1998).…”

mentioning

confidence: 99%

“…Most experiments on wild plants have used nutrient-rich composts or soils in which none of the major nutrients were limiting (Mortensen & Nilsen, 1992 ;Pearson et al, 1996 ;Lyons & Barnes, 1998). However, most natural and semi-natural communities exist on soils in which growth is limited by nutrients, toxic metals or anoxia.…”

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confidence: 99%

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The effects of nutrient limitation on the response of Plantago major to ozone

1998

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Most natural and semi-natural communities are limited by major nutrients such as nitrogen (N) or phosphorus (P), but most experiments on the effects of ozone on wild plants have used nutrient-rich composts or soil. In order to investigate interactions between ozone and low nutrient supply, two artificially selected lines (ozone-resistant and ozone-sensitive) of two populations Plantago major ssp. major L. were grown on a sandy loam, with (HN) and without (LN) addition of fertilizer. The soil was from a semi-natural grassland that has never been fertilized. Plants were exposed to either charcoal\Purafil2-filtered air (CF l 5 nl O $ l −" ) or 70 nl O $ 1 −" 7 h d −" from the seedling stage to seed production.Poor growth (c. 25 % of that in HN) of the low-nutrient plants, and leaf concentrations of N and P showed that the LN plants were severely nutrient-limited. In addition to affecting the total dry mass of the plants, the nutrient supply altered seed production, reproductive effort (number of seeds per total mass) and root-to-shoot allocation. Exposure to ozone had significant effects on physiology, growth, and seed production that varied with population, selection line, time, and plant development. There also were significant interactions between ozone effects and nutrient regime. In the Lullington Heath population, ozone reduced plant dry weight at 4 wk only in the LN treatment, and in the sensitive line of the Bush population, seed production was reduced by ozone only in LN. Therefore, contrary to what was expected, in the present experiment, plants given the LN treatment were often more sensitive to ozone than those grown under the high-nutrient regime. This increase in sensitivity was despite the fact that the LN treatment reduced stomatal conductance and ozone flux. It is concluded that there are potentially important interactions between ozone and low nutrient supply that need further investigation, particularly under field conditions.

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Section: mentioning

confidence: 94%

Section: mentioning

confidence: 99%

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confidence: 99%

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The effects of nutrient limitation on the response of Plantago major to ozone

1998

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“…The factors that determine plant sensitivity or tolerance have not yet been clarified, but it seems clear that they involve physiological, anatomical, biochemical and environmental aspects (Alonso et al, 2001). Therefore, the ranking of relative resistance to ozone often varies with the criterion used for it determination (Pearson et al, 1996).…”

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confidence: 99%

Physiological disturbances promoted by ozone in five cultivars of Phaseolus vulgaris L.

Clebsch

Divan

Oliveira

et al. 2009

Braz. J. Plant Physiol.

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Bean seedlings of Fepagro 26, Guapo Brilhante, Iraí, Macotaço and US Pinto 111 cultivars were submitted to treatments with or without addition of ozone to the ambient air, in order to evaluate the effects of exposure on photosynthesis, relative electrolyte leakage, foliar abscission and biomass of the seedlings. Exposure to ozone caused significant decreases in the net assimilation of all cultivars except Iraí. It also caused a significant increase in electrolyte leakage from the Pinto cultivar, but only when AOT 40 was the highest. It also produced significant anticipation in the time of foliar abscission in the Pinto, Fepagro and Guapo cultivars. The variability observed in the biomass measurements reflected the limitations to perform long-term controlled-environment studies, one of the major challengers yet to be overcome in order to obtain more conclusive data on damages induced on crop species resulting from tropospheric ozone enrichment.Key words: photosynthesis, relative electrolyte leakage, foliar abscission, biomass. resuMo Distúrbios fisiológicos promovidos pelo ozônio em cinco cultivares de Phaseolus vulgaris l. Plântulas de feijão das cultivares Fepagro 26, Guapo Brilhante, Iraí, Macotaço e US pinto 111 foram submetidas aos tratamentos com e sem adição de ozônio ao ar ambiente, com o objetivo de avaliar os efeitos da exposição sobre a fotossíntese, permeabilidade relativa a eletrólitos, abscisão foliar e biomassa das plântulas. A exposição ao ozônio causou decréscimos significativos na assimilação líquida de todas as cultivares, exceto na Iraí. Causou também um aumento significativo na permeabilidade relativa a eletrólitos da cultivar Pinto, mas apenas quando a AOT 40 foi a mais elevada. Além disso, produziu uma antecipação significativa no tempo de abscisão foliar nas cultivares Pinto, Fepagro e Guapo. A variabilidade observada nas medidas de biomassa total, refletiu as limitações para se executar estudos de longo prazo em condições ambientais controladas, um dos principais desafios ainda por ser superado antes que se possa obter dados mais conclusivos sobre os danos em espécies cultivadas resultantes do enriquecimento do ozônio toposférico.

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