Antagonism between elevated CO2, nighttime warming, and summer drought reduces the robustness of PSII performance to freezing events

2013 ◽  
Vol 93 ◽  
pp. 1-12 ◽  
Author(s):  
Kristian Rost Albert ◽  
Kristine Boesgaard ◽  
Helge Ro-Poulsen ◽  
Teis N. Mikkelsen ◽  
Susanne Andersen ◽  
...  
Keyword(s):  
Elevated Co2 ◽  
Summer Drought ◽  
Nighttime Warming

scholarly journals Long-term effects of elevated CO2, nighttime warming and drought on plant secondary metabolites in a temperate heath ecosystem

2020 ◽  
Vol 125 (7) ◽  
pp. 1065-1075
Author(s):  
Tao Li ◽  
Päivi Tiiva ◽  
Åsmund Rinnan ◽  
Riitta Julkunen-Tiitto ◽  
Anders Michelsen ◽  
...  
Keyword(s):  
Climate Change ◽  
Secondary Metabolites ◽  
Elevated Co2 ◽  
Chemical Constituents ◽  
Plant Secondary Metabolites ◽  
Plant Secondary Metabolite ◽  
Summer Drought ◽  
Voc Emissions ◽  
Nighttime Warming ◽  
Change Components

Abstract Background and Aims Plant secondary metabolites play critical roles in plant stress tolerance and adaptation, and are known to be influenced by the environment and climate changes, yet the impacts and interactions of multiple climate change components are poorly understood, particularly under natural conditions. Methods Accumulation of phenolics and emissions of volatile organic compounds (VOCs) were assessed on heather, Calluna vulgaris, an abundant evergreen dwarf shrub in European heathlands, after 6 years of exposure to elevated CO2, summer drought and nighttime warming. Key Results Drought alone had the strongest effects on phenolic concentrations and compositions, with moderate effects of elevated CO2 and temperature. Elevated CO2 exerted the greatest impact on VOC emissions, mainly by increasing monoterpene emissions. The response magnitudes varied among plant tissue types and chemical constituents, and across time. With respect to interactive effects of the studied climate change components, the interaction between drought and elevated CO2 was most apparent. Drought mainly reduced phenolic accumulation and VOC emissions, while elevated CO2 mitigated such effects. Conclusions In natural ecosystems, co-occurring climate factors can exert complex impacts on plant secondary metabolite profiles, which may in turn alter ecosystem processes.

scholarly journals Root growth and N dynamics in response to multi-year experimental warming, summer drought and elevated CO2 in a mixed heathland-grass ecosystem

2014 ◽  
Vol 41 (1) ◽  
pp. 1 ◽  
Author(s):  
M. F. Arndal ◽  
I. K. Schmidt ◽  
J. Kongstad ◽  
C. Beier ◽  
A. Michelsen
Keyword(s):  
Root Growth ◽  
Elevated Co2 ◽  
Environmental Changes ◽  
Nitrogen Concentration ◽  
N Uptake ◽  
Root Production ◽  
Summer Drought ◽  
Whole Plant ◽  
Grass Root ◽  
Biomass N

Ecosystems exposed to elevated CO2 are often found to sequester more atmospheric carbon due to increased plant growth. We exposed a Danish heath ecosystem to elevated CO2, elevated temperature and extended summer drought alone and in all combinations in order to study whether the expected increased growth would be matched by an increase in root nutrient uptake of NH4+-N and NO3– -N. Root growth was significantly increased by elevated CO2. The roots, however, did not fully compensate for the higher growth with a similar increase in nitrogen uptake per unit of root mass. Hence the nitrogen concentration in roots was decreased in elevated CO2, whereas the biomass N pool was unchanged or even increased. The higher net root production in elevated CO2 might be a strategy for the plants to cope with increased nutrient demand leading to a long-term increase in N uptake on a whole-plant basis. Drought reduced grass root biomass and N uptake, especially when combined with warming, but CO2 was the most pronounced main factor effect. Several significant interactions of the treatments were found, which indicates that the responses were nonadditive and that changes to multiple environmental changes cannot be predicted from single-factor responses alone.

Monoterpene emissions in response to long-term night-time warming, elevated CO2 and extended summer drought in a temperate heath ecosystem

2017 ◽  
Vol 580 ◽  
pp. 1056-1067 ◽  
Author(s):  
Päivi Tiiva ◽  
Jing Tang ◽  
Anders Michelsen ◽  
Riikka Rinnan
Keyword(s):  
Elevated Co2 ◽  
Summer Drought ◽  
Night Time

Belowground heathland responses after 2 years of combined warming, elevated CO2 and summer drought

2010 ◽  
Vol 101 (1-3) ◽  
pp. 27-42 ◽  
Author(s):  
Louise C. Andresen ◽  
Anders Michelsen ◽  
Per Ambus ◽  
Claus Beier
Keyword(s):  
Elevated Co2 ◽  
Summer Drought

Global change belowground: impacts of elevated CO2, nitrogen, and summer drought on soil food webs and biodiversity

2011 ◽  
Vol 18 (2) ◽  
pp. 435-447 ◽  
Author(s):  
Nico Eisenhauer ◽  
Simone Cesarz ◽  
Robert Koller ◽  
Kally Worm ◽  
Peter B. Reich
Keyword(s):  
Global Change ◽  
Food Webs ◽  
Elevated Co2 ◽  
Summer Drought ◽  
Soil Food Webs

scholarly journals No carbon “bet hedging” in pine seedlings under prolonged summer drought and elevated CO2

2017 ◽  
Vol 106 (1) ◽  
pp. 31-46 ◽  
Author(s):  
Christoph Bachofen ◽  
Barbara Moser ◽  
Günter Hoch ◽  
Jaboury Ghazoul ◽  
Thomas Wohlgemuth
Keyword(s):  
Elevated Co2 ◽  
Summer Drought ◽  
Bet Hedging ◽  
Pine Seedlings

scholarly journals Resistance of soil protein depolymerization rates to eight years of elevated CO2, warming, and summer drought in a temperate heathland

2018 ◽  
Vol 140 (3) ◽  
pp. 255-267 ◽  
Author(s):  
Birgit Wild ◽  
Per Ambus ◽  
Sabine Reinsch ◽  
Andreas Richter
Keyword(s):  
Elevated Co2 ◽  
Summer Drought ◽  
Soil Protein

White clover sensitivity to UV-B radiation - biochemical relationships and interaction with drought

2003 ◽  
pp. 273-277
Author(s):  
R.W. Hofmann ◽  
B.D. Campbell ◽  
E.E. Swinny ◽  
S.J. Bloor ◽  
K.R. Markham ◽  
...  
Keyword(s):  
New Zealand ◽  
White Clover ◽  
Ultraviolet B ◽  
Summer Drought ◽  
Stress Protection ◽  
Trade Offs ◽  
Population Comparisons ◽  
Potential Benefits ◽  
Quercetin Glycosides ◽  
Balance Trade

During summertime in New Zealand, white clover experiences high levels of ultraviolet-B (UV-B) radiation. This frequently coincides with periods of summer drought. We investigated responses to UV-B and to the combination of UV-B and drought in various white clover populations, including New Zealand cultivars and ecotypes as well as overseas germplasm. The results were obtained under controlled environmental conditions in three independent trials. Overall, white clover growth was reduced by UV-B. The population comparisons indicated that low growth rate and adaptation to other forms of stress may be related to UV-B tolerance under well-watered conditions, but not during extended periods of drought. Flavonoid pigments that are involved in stress protection were strongly increased under UV-B and were further enhanced in the combination of UV-B and drought. The responses among these flavonoids were highly specific, with more pronounced UV-B-induced increases in quercetin glycosides, compared to their closely related kaempferol counterparts. UV-B toler ance of the less productive white clover populations was linked to the accumulation of quercetin compounds. In conclusion, these studies suggest (i) that slow-growing white clover ecotypes adapted to other stresses have higher capacity for biochemical acclimation to UV-B under well-watered conditions and (ii) that these biochemical attributes may also contribute to decreased UV-B sensitivity across white clover populations under drought. The findings alert plant breeders to potential benefits of selecting productive germplasm for high levels of specific flavonoids to balance trade-offs between plant productivity and stress tolerance. Keywords: Drought, flavonoids, genetic variation, HPLC, kaempferol, quercetin, str ess, Trifolium repens L., ultraviolet-B, white clover

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