Photosynthetic Acclimation to Light Regime and Water Stress by the C 3 - CAM Epiphyte Guzmania monostachia: Gas-Exchange Characteristics, Photochemical Efficiency and the Xanthophyll Cycle

Maxwell, C.; Griffiths, Howard; Young, Andrew

doi:10.2307/2390234

Cited by 95 publications

(73 citation statements)

References 20 publications

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“…The more adequate analysis on how water stress affects acclimation shall be conducted with more recent versions of TEM that incorporate the effects of changing plant canopy due to carbon dynamics on hydrological cycling (Felzer et al, 2009). In addition, acclimation of photosynthesis and respirations to other factors such as nutrient availability and irradiance and their interactive effects should also be considered in future analysis (Maxwell et al, 1994;Valladares and Pearcy, 1997;Atkin et al, 2005). Variations of ET and WUE simulated with the previous and the revised versions of TEM from 1990 to 2100 over the study region and each climatic zone.…”

Section: Limitations and Uncertaintiesmentioning

confidence: 99%

Modelling temperature acclimation effects on the carbon dynamics of forest ecosystems in the conterminous United States

Chen¹,

Zhuang²

2013

Tellus B: Chemical and Physical Meteorology

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A B S T R A C TThe projected rise in temperature in the 21st century will alter forest ecosystem functioning and carbon dynamics. To date, the acclimation of plant photosynthesis to rising temperature has not been adequately considered in earth system models. Here we present a study on regional ecosystem carbon dynamics under future climate scenarios incorporating temperature acclimation effects into a large-scale ecosystem model, the terrestrial ecosystem model (TEM). We first incorporate a general formulation of the temperature acclimation of plant photosynthesis into TEM, and then apply the revised model to the forest ecosystems of the conterminous United States for the 21st century under the future Intergovernmental Panel on Climate Change (IPCC) Special Report on Emissions Scenarios (SRES) climate scenarios A1FI, A2, B1 and B2. We find that there are significant differences between the estimates of carbon dynamics from the previous and the revised models. The largest differences occur under the A1FI scenario, in which the model that considers acclimation effects predicts that the region will act as a carbon sink, and that cumulative carbon in the 21st century will be 35 Pg C higher than the estimates from the model that does not consider acclimation effects. Our results further indicate that in the region there are spatially different responses to temperature acclimation effects. This study suggests that terrestrial ecosystem models should take temperature acclimation effects into account so as to more accurately quantify ecosystem carbon dynamics at regional scales.

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Section: Limitations and Uncertaintiesmentioning

confidence: 99%

Modelling temperature acclimation effects on the carbon dynamics of forest ecosystems in the conterminous United States

Chen¹,

Zhuang²

2013

Tellus B: Chemical and Physical Meteorology

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“…The simultaneous exposition to CP and c-PTIO had a synergic negative effect on photosynthesis; F v /F m and V PSII values were around a 60% lower than upon a water rehydration. The oxidation degree of the Quinone A (Q A ), determined by q P , depends on the activation state of the Photosystem I (PSI) and the Calvin cycle (Maxwell et al, 1994). After the dehydrationerehydration treatments q P remained unaltered indicating that photoinhibition was produced before Q A in the photosynthetic electron transport chain.…”

Section: Photosynthetic Activitymentioning

confidence: 99%

The organic air pollutant cumene hydroperoxide interferes with NO antioxidant role in rehydrating lichen

Catalá

Gasulla

García‐Breijo

et al. 2013

Environmental Pollution

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t r a c tOrganic pollutants effects on lichens have not been addressed. Rehydration is critical for lichens, a burst of free radicals involving NO occurs. Repeated dehydrations with organic pollutants could increase oxidative damage. Our aim is to learn the effects of cumene hydroperoxide (CP) during lichen rehydration using Ramalina farinacea (L.) Ach., its photobiont Trebouxia spp. and Asterochloris erici. Confocal imaging shows intracellular ROS and NO production within myco and phycobionts, being the chloroplast the main source of free radicals. CP increases ROS, NO and lipid peroxidation and reduces chlorophyll autofluorescence, although photosynthesis remains unaffected. Concomitant NO inhibition provokes a generalized increase of ROS and a decrease in photosynthesis. Our results suggest that CP induces a compensatory hormetic response in Ramalina farinacea that could reduce the lichen's antioxidant resources after repeated desiccation-rehydration cycles. NO is important in the protection from CP.

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“…While Ф PSII gives the proportion of absorbed energy used in photochemistry, qP provides an indication of the proportion of PSII reaction centres that are open, and therefore, (1 -qP) gives the proportion of centres that are closed, which is sometimes termed as 'excitation pressure on PSII (Maxwell et al, 1994).…”

Section: Photochemical Processesmentioning

confidence: 99%

Use of Chlorophyll Fluorescence Parameters to Assess Drought Tolerance of Coconut Varieties

Nainanayake

2009

COCOS

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Chlorophyll fluorescence analysis as a measure of photosynthesis is increasingly used in eco-physiological studies. It is particularly useful in investigations on the photosynthetic performance of plants in stressful environments. Chlorophyll fluorescence, which can be measured rapidly and conveniently, provides insights into a plant's ability to tolerate environmental stresses such as those of a drought. Damage to the photosynthetic apparatus due to moisture or heat stress, which would reduce photosynthetic assimilation and eventually the yield, can be detected at a very early stage of the drought. This technique is widely used to identify stress tolerant plants and crop varieties. However, this technique has not been utilized to identify putative drought tolerant coconut varieties. Hence, the objective of this study was to set out the basic principles of the technique, discuss its applications in eco-physiological studies, and evaluate its potential to screen coconut varieties for drought tolerance.San Ramon, a tall form of coconut introduced to Sri Lanka few decades ago and a few other local tall accessions in the germplasm conservation blocks in the Coconut Research Institute of Sri Lanka appeared to possess a photosynthetic apparatus which was clearly more tolerant to moisture stress conditions than the other accessions. SRR, SRG, SA, CL PI & PW were the most drought tolerant of the 40 genotypes tested. The results generated by using F v /F m , were consistent with results of other important parameters such as the rate of photosynthesis and water use efficiency. Even the basic parameters of chlorophyll fluorescence, for instance the maximum quantum yield of photosystem II (F v /F m ) measured on dark-adapted coconut leaves showed promise as a selection criterion in future screening programmes due to its quick, non-invasive and reliable nature. Similarities of fluorescence parameters observed between seedlings and adult palms enables fairly confident predictions on the performance of adult palms, based on studies with seedlings. In general, chlorophyll fluorescence appears as a promising tool for screening coconut palms for their drought tolerance.

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Photosynthetic Acclimation to Light Regime and Water Stress by the C 3 - CAM Epiphyte Guzmania monostachia: Gas-Exchange Characteristics, Photochemical Efficiency and the Xanthophyll Cycle

Cited by 95 publications

References 20 publications

Modelling temperature acclimation effects on the carbon dynamics of forest ecosystems in the conterminous United States

Modelling temperature acclimation effects on the carbon dynamics of forest ecosystems in the conterminous United States

The organic air pollutant cumene hydroperoxide interferes with NO antioxidant role in rehydrating lichen

Use of Chlorophyll Fluorescence Parameters to Assess Drought Tolerance of Coconut Varieties

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