Growth in Elevated CO2 Can Both Increase and Decrease Photochemistry and Photoinhibition of Photosynthesis in a Predictable Manner. <i>Dactylis glomerata</i> Grown in Two Levels of Nitrogen Nutrition

Hymus, Graham J.; Baker, Neil R.; Long, Stephen P.

doi:10.1104/pp.010248

Cited by 89 publications

(53 citation statements)

References 29 publications

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“…More research is needed on the effect of CO 2 on PSII efficiency at ET, since the publication bias on this effect could not be ignored in this meta-analysis. At AT, elevated CO 2 increases F v /F m in legumes but decreases it in non-legumes, which indirectly supports the hypothesis that eCO 2 decreases photoinhibition under conditions of high N but increases photoinhibition under conditions of low N (Hymus et al 2001). RA was negatively affected by eCO 2 at AT, ET, and HS (Fig.…”

Section: Discussionsupporting

confidence: 76%

A meta-analysis of plant physiological and growth responses to temperature and elevated CO2

et al. 2011

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Atmospheric carbon dioxide (CO(2)) and global mean temperature are expected to be significantly higher by the end of the 21st century. Elevated CO(2) (eCO(2)) and higher temperature each affect plant physiology and growth, but their interactive effects have not been reviewed statistically with respect to higher chronic mean temperatures and abrupt heat stress. In this meta-analysis, we examined the effect of CO(2) on the physiology and growth of plants subjected to different temperature treatments. The CO(2) treatments were categorized into ambient (<400 ppm) or elevated (>560 ppm) levels, while temperature treatments were categorized into ambient temperature (AT), elevated temperature (ET; AT + 1.4-6°C), or heat stress (HS; AT + >8°C). Plant species were grouped according to photosynthetic pathways (C(3), C(4)), functional types (legumes, non-legumes), growth forms (herbaceous, woody), and economic purposes (crop, non-crop). eCO(2) enhanced net photosynthesis at AT, ET, and HS in C(3) species (especially at the HS level), but in C(4) species, it had no effect at AT, a positive effect at ET, and a negative effect at HS. The positive effect of eCO(2) on net photosynthesis was greater for legumes than for non-legumes at HS, for non-crops than crops at ET, and for woody than herbaceous species at ET and HS. Total (W (T)) and above- (W (AG)) and below-ground (W (BG)) biomass were increased by eCO(2) for most species groups at all temperatures, except for C(4) species and W (BG) of legumes at HS. Hence, eCO(2) × heat effects on growth were often not explained by effects on net photosynthesis. Overall, the results show that eCO(2) effects on plant physiology and growth vary under different temperature regimes, among functional groups and photosynthetic pathways, and among response variables. These findings have important implications for biomass accumulation and ecosystem functioning in the future when the CO(2) level is higher and climate extremes, such as heat waves, become more frequent.

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Section: Discussionsupporting

confidence: 76%

A meta-analysis of plant physiological and growth responses to temperature and elevated CO2

et al. 2011

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“…Organic C release has been suggested as an effective mechanism of maintaining the C and N balance in algae in response to low CO 2 levels, although it was an inefficient response to N limitation (Gordillo et al 2003). In addition, high DIC may alleviate photoinhibition because it promotes diminished photodynamic photoinhibition by dissipating excess light as was reported in Cyanobacteria (Qiu & Liu 2004) and terrestrial plants (Hymus et al 2001). This mechanism might have been operating in HNS algae, with increasing photosynthesis and photoprotection likely to have been stimulated by the enrichment of both C and N. While N yield in biomass was higher in HNS than in LNS Ulva, total biomass yield of algae from both treatments was similar.…”

Section: Discussionmentioning

confidence: 95%

Effects of nutrient supply on photosynthesis and pigmentation in Ulva lactuca (Chlorophyta): responses to short-term stress

et al. 2009

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The effects of nutrient supply on photosynthesis (estimated as chlorophyll fluorescence), chlorophyll content, biomass yield and proximate chemical composition of tank cultivated Ulva lactuca L. (Chlorophyta) were evaluated. To assess the effect of nutrient supply on resistance capacity against short-term stress, algae grown in high nutrient supply (HNS) fishpond effluents and in low nutrient supply (LNS) oligotrophic seawater were transferred to small vessels with increased irradiance of PAR and UV radiation (PAR+UVA and PAR+UVA+UVB using cut-off filters) and increased temperature as compared to culture tanks. Electron transport rate and chlorophyll content were higher in HNS than in LNS algae. Effective quantum yield and chlorophyll content decreased after short-term exposure to high PAR irradiance. Full recovery of photosynthesis in the shade was observed under a moderately higher temperature (Δ+ 6°C). UVB exposure reduced the negative effect of UVA on photosynthesis and pigment accumulation under temperature stress (Δ+10°C), particularly in HNS algae. Growth under HNS appeared to accelerate acclimation of Ulva lactuca to short-term environmental changes, such as higher temperatures (as in heat waves) and higher UV radiation. Furthermore, nitrogen enrichment reduced the common inhibitory effects of short-term stress such as increased irradiance, UV radiation and temperature on photosynthesis.

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“…This is because the stimulation of electron flow to the photosynthetic carbon reduction cycle will be greater than the competitive suppression of electron flow to the photorespiratory carbon oxidation cycle. Then the ratio of absorbed energy dissipated photochemically to that dissipated non-photochemically will rise (Hymus et al 2001). In algae possessing CCMs, photorespiration is normally lacking due to high CO 2 concentration around Rubisco even at ambient CO 2 levels in the medium (Beer et al 2000), so that the model proposed for higher plants is not likely to work in algae with CCMs.…”

Section: Introductionmentioning

confidence: 98%

Photon- and carbon-use efficiency in Ulva rigida at different CO 2 and N levels

Gordillo

Figueroa

Niell

2003

Planta

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The seaweed Ulva rigida C. Agardh (Chlorophyta) was cultured under two CO(2) conditions supplied through the air bubbling system: non-manipulated air and 1% CO(2)-enriched aeration. These were also combined with N sufficiency and N limitation, using nitrate as the only N source. High CO(2) in U. rigida led to higher growth rates without increasing the C fixed through photosynthesis under N sufficiency. Quantum yields for charge separation at photosystem II (PSII) reaction centres (phi(PSII)) and for oxygen evolution (phi(O2)) decreased at high CO(2) even in N-sufficient thalli. Cyclic electron flow around PSII as part of a photoprotection strategy accompanied by decreased antennae size was suspected. The new re-arrangement of the photosynthetic energy at high CO(2) included reduced investment in processes other than C fixation, as well as in carbon diverted to respiration. As a result, quantum yield for new biomass-C production (phi(growth)) increased. The calculation of the individual quantum yields for the different processes involved allowed the completion of the energy flow scheme through the cell from incident light to biomass production for each of the CO(2) and N-supply conditions studied.

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Growth in Elevated CO2 Can Both Increase and Decrease Photochemistry and Photoinhibition of Photosynthesis in a Predictable Manner. Dactylis glomerata Grown in Two Levels of Nitrogen Nutrition

Cited by 89 publications

References 29 publications

A meta-analysis of plant physiological and growth responses to temperature and elevated CO2

A meta-analysis of plant physiological and growth responses to temperature and elevated CO2

Effects of nutrient supply on photosynthesis and pigmentation in Ulva lactuca (Chlorophyta): responses to short-term stress

Photon- and carbon-use efficiency in Ulva rigida at different CO 2 and N levels

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