Ecophysiological responses of <i>Fagus sylvatica</i> seedlings to changing light conditions. I. Interactions between photosynthetic acclimation and photoinhibition during simulated canopy gap formation

Tognetti, Roberto; Johnson, Jon D.; Michelozzi, Marco

doi:10.1111/j.1399-3054.1997.tb01827.x

Cited by 39 publications

(11 citation statements)

References 48 publications

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“…Leaf nitrogen was positively and significantly related to soil nitrogen for both studied species. So, an increased availability of soil N is associated with higher concentrations of leaf N. These results corroborate with those of Tognetti, Johnson & Michelozzi (), Zatylny & St‐Pierre (), Orwin et al . () and He et al .…”

Section: Discussionsupporting

confidence: 90%

Leaf traits of two Mediterranean perennial tussock grass species in relation to soil nitrogen and phosphorus availability

Ghiloufi

Chaïeb

2015

Afr. J. Ecol.

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Studying relationships of plant traits to ecosystem properties is an emerging approach aiming to understand plant's potential effect on ecosystem functioning. In the current study, we explored links between morphological and nutritional leaf traits of two Mediterranean perennial grass species Stipa tenacissima and Lygeum spartum, widely used to prevent desertification process by stabilizing sand dunes. We evaluated also relationships in terms of nitrogen (N) and phosphorus (P) availability between leaves of the investigated species and the corresponding soil. Our results showed that leaf P was very low in comparison with leaf N for the two investigated species. In fact, chlorophyll content, photosynthesis capacity and water conservation during photosynthesis are mainly linked to leaf nitrogen content. Our findings support previous studies showing that at the species levels, morphological and nutritional leaf traits were not related. On the other hand, significant relationships were obtained between soil N and leaf N for S. tenacissima (P = 0.011) and L. spartum (P = 0.033). However, leaf P was not significantly related to soil P availability for both species. We suggest that any decrease in soil N with the predicted increasing aridity may result in reduction in leaf N and thus in worst dysfunction of some biological processes levels.

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Section: Discussionsupporting

confidence: 90%

Leaf traits of two Mediterranean perennial tussock grass species in relation to soil nitrogen and phosphorus availability

Ghiloufi

Chaïeb

2015

Afr. J. Ecol.

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“…Photoinhibition occurs under a variety of stressful conditions for the seedlings of many species (Farage 1996; Ball et al . 1997; Tognetti, Johnson & Michelozzi 1997); although we focused on full‐sized plants, the responses of seedlings to altered climatic conditions deserve greater attention.…”

Section: Discussionmentioning

confidence: 99%

Photosynthetic responses to a climate‐warming manipulation for contrasting meadow species in the Rocky Mountains, Colorado, USA

2000

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Summary 1.Microclimate was measured and photosynthetic responses to a climate warming manipulation were compared for the evergreen shrub Artemisia tridentata and the herbaceous forb Erigeron speciosus in the Rocky Mountains, Colorado, USA. 2. Soil was warmer and drier under infra-red heaters compared with control plots. 3. Midday xylem pressure potential did not differ for A. tridentata on heated vs control plots but was lower for E. speciosus on heated plots compared with controls. Leaf temperatures did not vary for the two species on heated or control plots. 4. There were no significant treatment or species differences in the diurnal patterns of CO 2 assimilation or stomatal conductance to water vapour. Also, there were no differences in responses to leaf temperature. 5. The quantum yield for CO 2 assimilation over a range of PPFD was lower for plants on heated plots. There was a marked difference between species in the pattern of stomatal conductance to water vapour over a range of PPFD, but no differences as a result of the heating treatment. 6. The quantum efficiency of PSII electron transport was significantly affected by heating. Non-radiative energy dissipation was greater for A. tridentata compared with E. speciosus . There was recovery of F V / F M for A. tridentata but not for E. speciosus . 7. Heating appears to affect plants via changes in soil water content rather than by increasing leaf temperature. The deciduous species E. speciosus appears to undergo some permanent closure of PSII on heated plots, in contrast to the evergreen shrub A. tridentata . Such differences may help explain the increase in above-ground biomass accumulation in response to heating for shrubs, compared with the decrease observed for deciduous herbaceous species.

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“…Photosynthesis of understory beech trees in a natural regeneration responded very fast to moving light flecks (Tognetti et al 1998). However, buds of understory beech displayed only a limited acclimatory capacity to high light intensities; such conditions resulted in the death of the plants after long‐term exposure (Tognetti et al 1997). This observation suggests that fully sun‐acclimated beech leaves require either high‐preformed capacities to dissipate excess light energy or must have a high metabolic flexibility of protective systems to adjust to fluctuating environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Diurnal fluctuations of antioxidative systems in leaves of field‐grown beech trees (Fagus sylvatica): Responses to light and temperature

Peltzer

Polle

2001

Physiologia Plantarum

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To test the hypothesis that antioxidant systems flexibly ad-rather than light-regulated. In contrast to the enzymatic defences, ascorbate levels increased by about 30% under bright just to short-term, diurnal fluctuations of ambient environmental conditions, ascorbate-related systems were studied sunlight suggesting that protection from excess light is mediated via the adjustment of metabolites. Under these condi-over several day/night cycles in mature sun-acclimated leaves tions the apparent electron transport rate exceeded the of field-grown beech trees (Fagus syl7atica). Light-dependent capacity for assimilation and the dehydroascorbate pool in-increases in the activities of ascorbate peroxidase (APX, EC 1.11.1.11), monodehydroascorbate radical reductase creased twofold. Since dehydroascorbate reductase activities were hardly detected, MDAR activities seemed to be the (MDAR, EC 1.1.5.4) and glutathione reductase (GR, EC 1.6.4.2) were not observed. Lowest activities of APX and major enzyme to keep ascorbate in its reduced state. However, MDAR appeared to be insufficient to maintain the MDAR were found on hot, sunny days. A strong negative correlation occurred between APX activities and ambient redox balance of the ascorbate pool under high light intensitemperatures suggesting that this enzyme was temperature-ties in the field.

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Ecophysiological responses of Fagus sylvatica seedlings to changing light conditions. I. Interactions between photosynthetic acclimation and photoinhibition during simulated canopy gap formation

Abstract: Michelozzi, M. 1997. Ecophysiological responses of Eagus sylvatica seedlings to changing light conditions. I. Interactions between photosynthetic acchmation and photoinhibition during simulated canopy gap formation. -Physiol. Plant. 101: 115-123.

Cited by 39 publications

References 48 publications

Leaf traits of two Mediterranean perennial tussock grass species in relation to soil nitrogen and phosphorus availability

Leaf traits of two Mediterranean perennial tussock grass species in relation to soil nitrogen and phosphorus availability

Photosynthetic responses to a climate‐warming manipulation for contrasting meadow species in the Rocky Mountains, Colorado, USA

Diurnal fluctuations of antioxidative systems in leaves of field‐grown beech trees (Fagus sylvatica): Responses to light and temperature

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