Genetic Variation of Ecophysiological Responses to CO2 in Picea glauca Seedlings

Dang, Qing-Lai; Maepea, Jodi M.; Parker, William H.

doi:10.2174/1874398600801010068

Cited by 9 publications

(6 citation statements)

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“…Photosynthetic rate ( A max ) showed a clinal variation with southern populations exhibiting a higher A max than northern populations (Figure 4B ). This pattern is in agreement with previous findings (Kogami et al, 2001 ; Dang et al, 2008 ; Qiuhong et al, 2013 ; Benomar et al, 2015 ). However, the results are in conflict with others that demonstrated a positive latitudinal cline in A max driven by needle nitrogen ( N mass ) and carboxylation capacity ( V c max ) (Oleksyn et al, 1998 ; Soolanayakanahally et al, 2009 ).…”

Section: Discussionsupporting

confidence: 94%

“…For instance, leaf nitrogen concentration ( N mass ) and respiration rate ( R d ) have been found to increase with latitude and elevation while specific leaf area (SLA) decreases (Friend et al, 1989 ; Oleksyn et al, 1998 ; Hultine and Marshall, 2000 ; Qiuhong et al, 2013 ). Photosynthetic rate ( A max ) has also been reported to increase with latitude and elevation (Cordell et al, 1998 ; Oleksyn et al, 1998 ; Soolanayakanahally et al, 2009 ), but has been also reported to decrease or to have no linear relationships with latitude or elevation (Kogami et al, 2001 ; Dang et al, 2008 ; Qiuhong et al, 2013 ; Benomar et al, 2015 ). A max is affected by biochemical and biophysical processes and environmental conditions (Sharkey et al, 2007 ).…”

Section: Introductionmentioning

confidence: 99%

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Genetic Adaptation vs. Ecophysiological Plasticity of Photosynthetic-Related Traits in Young Picea glauca Trees along a Regional Climatic Gradient

et al. 2016

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Assisted population migration (APM) is the intentional movement of populations within a species range to sites where future environmental conditions are projected to be more conducive to growth. APM has been proposed as a proactive adaptation strategy to maintain forest productivity and to reduce the vulnerability of forest ecosystems to projected climate change. The validity of such a strategy will depend on the adaptation capacity of populations, which can partially be evaluated by the ecophysiological response of different genetic sources along a climatic gradient. This adaptation capacity results from the compromise between (i) the degree of genetic adaptation of seed sources to their environment of origin and (ii) the phenotypic plasticity of functional trait which can make it possible for transferred seed sources to positively respond to new growing conditions. We examined phenotypic variation in morphophysiological traits of six seed sources of white spruce (Picea glauca [Moench] Voss) along a regional climatic gradient in Québec, Canada. Seedlings from the seed sources were planted at three forest sites representing a mean annual temperature (MAT) gradient of 2.2°C. During the second growing season, we measured height growth (H2014) and traits related to resources use efficiency and photosynthetic rate (Amax). All functional traits showed an adaptive response to the climatic gradient. Traits such as H2014, Amax, stomatal conductance (gs), the ratio of mesophyll to stomatal conductance, water use efficiency, and photosynthetic nitrogen-use efficiency showed significant variation in both physiological plasticity due to the planting site and seed source variation related to local genetic adaptation. However, the amplitude of seed source variation was much less than that related to plantation sites in the area investigated. The six seed sources showed a similar level of physiological plasticity. H2014, Amax and gs, but not carboxylation capacity (Vcmax), were correlated and decreased with a reduction of the average temperature of the growing season at seed origin. The clinal variation in H2014 and Amax appeared to be driven by CO2 conductance. The presence of locally adapted functional traits suggests that the use of APM may have advantages for optimizing seed source productivity in future local climates.

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Section: Discussionsupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Genetic Adaptation vs. Ecophysiological Plasticity of Photosynthetic-Related Traits in Young Picea glauca Trees along a Regional Climatic Gradient

et al. 2016

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“…The seedlings were exposed to two CO 2 concentrations with (BGC-1) or without (BGC-0) belowground competitions at low (LN) and high (HN) nutrient supply for 4 months. Bars with different letters were significantly different from each other (P ≤ 0.05) the 223% enhancement reported by Dang et al (2008). The differences in the magnitude of enhancement might be attributable to variations in experimental protocols and genetic characteristics of the seedlings.…”

Section: Discussionmentioning

confidence: 69%

“…Therefore, it is possible that the small root volume in Johnsen's study has restricted seedling ability to take full advantage of the elevated CO 2 . Dang et al (2008) used seedlings from 11 provenances across Ontario while the current study used only one provenance. It is possible that the genetic potential of our provenance to respond to CO 2 elevation is lower than the average of the 11 provenances used in Dang et al (2008).…”

Section: Discussionmentioning

confidence: 99%

High nutrient supply and interspecific belowground competition enhance the relative performance of Picea mariana (Mill). B.S.P seedlings over Picea glauca [Moench] Voss. under elevated CO2

Marfo

Dang

et al. 2021

Annals of Forest Science

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Key messageWe tested how nutrient supply and interspecific belowground competition affect ecophysiological and morphological responses to elevated CO 2 in black (Picea mariana (Mill). B.S.P) and white spruce (Picea glauca [Moench] Voss.). It is found that belowground competition and high nutrient greatly enhanced the relative performance of black spruce over white spruce at elevated CO 2 . Context We have previously found that interspecific belowground competition reduce growth, whole seedling photosynthesis, and biomass allocation to leaf and that belowground competition and nutrient supply affect responses to elevated CO 2 in the above two species, but we did not examine the physiological and morphological mechanisms of the responses. Aims To examine the interactive effects of belowground competition, nutrient supply and elevated CO 2 on root morphology, photosynthetic rate, and biochemical and photochemical capacity of photosynthesis in black spruce (Sb, Picea mariana [Mill.] B.S.P.) and white spruce (Sw, Picea glauca [Moench] Voss.). Methods Seedlings were grown in individual containers (no belowground competition) or in a common container (belowground competition) under 380 vs. 720 µmol mol −1 CO 2 and high vs. low nutrient supply in the greenhouse for one growing season. Results Elevated CO 2 stimulated photosynthesis and nutrient use efficiency to a much greater degree in black than white spruce when they were grown in the same container, particularly under high nutrient supply. The ability to produce a greater length of roots per unit volume of soil was associated with the response of black spruce. ConclusionThe synergistic effects of elevated CO 2 and belowground competition on the physiology and root morphology of black spruce suggest that elevated CO 2 will likely increase the relative competitiveness of black spruce over white spruce.

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“…Experimental manipulations in greenhouses (Dang et al, 2008) show that increased CO 2 fertilization from 360 mmol mol -1 (close to ambient atmospheric concentration) to 530 mmol mol -1 and 700 mmol mol -1 produced increased rates of water-use efficiencies for white spruce seedlings from a wide geographical range of provenances in Ontario, Canada (Fig. 5).…”

Section: Experimental Insights On Plant Responses To the New Arctic Cmentioning

confidence: 99%

Global warming and the Arctic: a new world beyond the reach of the Grinnellian niche?

MacDonald

2010

Journal of Experimental Biology

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SummaryThe levels of CO 2 in the atmosphere have already far exceeded values attained at any other time over at least the past 650,000 years. Temperature increases due to rising greenhouse gases will be amplified in Arctic and subarctic regions, and winter warming will be enhanced relative to summer warming. Climate in large areas of high latitudes may have no analogue in current climates or those of the recent geological past. Experimental field manipulations and laboratory studies indicate that plants will exhibit complex responses in photosynthesis, growth rates, phenology and reproductive functioning due to this combination of increasing temperatures, changing seasonality and increasing levels of CO 2 . The resulting changes in the abundance, distribution, growth rates and production of fruit and phenology of plant species will in turn impact animal populations. In predicting what the future biota of the 'New Arctic' will be like and developing appropriate conservation strategies, Grinnellian niche-based approaches are likely to be insufficient, and experimental ecological studies of organism response to specific anticipated changes in climate are crucial.

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Genetic Variation of Ecophysiological Responses to CO2 in Picea glauca Seedlings

Cited by 9 publications

References 40 publications

Genetic Adaptation vs. Ecophysiological Plasticity of Photosynthetic-Related Traits in Young Picea glauca Trees along a Regional Climatic Gradient

Genetic Adaptation vs. Ecophysiological Plasticity of Photosynthetic-Related Traits in Young Picea glauca Trees along a Regional Climatic Gradient

High nutrient supply and interspecific belowground competition enhance the relative performance of Picea mariana (Mill). B.S.P seedlings over Picea glauca [Moench] Voss. under elevated CO2

Global warming and the Arctic: a new world beyond the reach of the Grinnellian niche?

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