Down-regulation of photosynthesis and its relationship with changes in leaf N allocation and N availability after long-term exposure to elevated CO2 concentration

Byeon, Siyeon; Song, Won Hoon; Park, Minjee; Kim, Sukyung; Kim, Seohyun; Lee, HoonTaek; Jeon, Jihyeon; Kim, Kunhyo; Lee, Minsu; Lim, Hyemin; Han, Sim-Hee; Oh, Chang‐Young

doi:10.1016/j.jplph.2021.153489

Cited by 14 publications

(8 citation statements)

References 61 publications

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“…S2), as has been reported in other studies, e.g. Gardner et al (2021) and Byeon et al (2021), indicated that enhancement of A max at eCO 2 was a function of a coordination between V cmax and J max (Yang et al 2021). On the other hand, a coupling between leaf N and A max was not surprising (Fig.…”

Section: Woody Plant Responses To Varying Eco 2 Concentrationssupporting

confidence: 86%

A global meta-analysis of woody plant responses to elevated CO2: implications on biomass, growth, leaf N content, photosynthesis and water relations

et al. 2022

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Background Atmospheric CO2 may double by the year 2100, thereby altering plant growth, photosynthesis, leaf nutrient contents and water relations. Specifically, atmospheric CO2 is currently 50% higher than pre-industrial levels and is projected to rise as high as 936 μmol mol−1 under worst-case scenario in 2100. The objective of the study was to investigate the effects of elevated CO2 on woody plant growth, production, photosynthetic characteristics, leaf N and water relations. Methods A meta-analysis of 611 observations from 100 peer-reviewed articles published from 1985 to 2021 was conducted. We selected articles in which elevated CO2 and ambient CO2 range from 600–1000 and 300–400 μmol mol−1, respectively. Elevated CO2 was categorized into < 700, 700 and > 700 μmol mol−1 concentrations. Results Total biomass increased similarly across the three elevated CO2 concentrations, with leguminous trees (LTs) investing more biomass to shoot, whereas non-leguminous trees (NLTs) invested to root production. Leaf area index, shoot height, and light-saturated photosynthesis (Amax) were unresponsive at < 700 μmol mol−1, but increased significantly at 700 and > 700 μmol mol−1. However, shoot biomass and Amax acclimatized as the duration of woody plants exposure to elevated CO2 increased. Maximum rate of photosynthetic Rubisco carboxylation (Vcmax) and apparent maximum rate of photosynthetic electron transport (Jmax) were downregulated. Elevated CO2 reduced stomatal conductance (gs) by 32% on average and increased water use efficiency by 34, 43 and 63% for < 700, 700 and > 700 μmol mol−1, respectively. Leaf N content decreased two times more in NLTs than LTs growing at elevated CO2 than ambient CO2. Conclusions Our results suggest that woody plants will benefit from elevated CO2 through increased photosynthetic rate, productivity and improved water status, but the responses will vary by woody plant traits and length of exposure to elevated CO2.

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Section: Woody Plant Responses To Varying Eco 2 Concentrationssupporting

confidence: 86%

A global meta-analysis of woody plant responses to elevated CO2: implications on biomass, growth, leaf N content, photosynthesis and water relations

et al. 2022

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“…This nitrogen‐acquisition‐driven photosynthetic CO 2 acclimation has been interpreted by the consistent reduction in leaf nitrogen concentration and photosynthetic capacity at both leaf and ecosystem levels (Ainsworth & Long, 2005; Wang et al, 2020). In contrast, the least‐cost optimality theory states that nitrogen utilization in leaves may be more important for regulating photosynthetic capacity under eCO 2 than leaf nitrogen concentration (Byeon et al, 2021; Smith & Keenan, 2020). The above hypotheses are usually considered independently and challenged by conflicting experimental evidence.…”

Section: Discussionmentioning

confidence: 99%

“…Variation in PNUE indicates a flexible nitrogen allocation strategy of plants. To maximize photosynthesis under elevated CO 2 , plants could reinvest leaf nitrogen from Rubisco to other photosynthetic processes limiting potential leaf‐level photosynthesis (Ainsworth & Long, 2005; Ali et al, 2016; Byeon et al, 2021). Thus, we can quantitatively assess photosynthetic capacity via three leaf traits, i.e., N m , LMA, and PNUE.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen use strategy drives interspecific differences in plant photosynthetic CO₂ acclimation

Cui

Xia

Luo

2023

Global Change Biology

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Rising atmospheric CO2 concentration triggers an emergent phenomenon called plant photosynthetic acclimation to elevated CO2 (PAC). PAC is often characterized by a reduction in leaf photosynthetic capacity (Asat), which varies dramatically along the continuum of plant phylogeny. However, it remains unclear whether the mechanisms responsible for PAC are also different across plant phylogeny, especially between gymnosperms and angiosperms. Here, by compiling a dataset of 73 species, we found that although leaf Asat increased significantly from gymnosperms to angiosperms, there was no phylogenetic signal in the PAC magnitude along the phylogenetic continuum. Physio‐morphologically, leaf nitrogen concentration (Nm), photosynthetic nitrogen‐use efficiency (PNUE), and leaf mass per area (LMA) dominated PAC for 36, 29, and 8 species, respectively. However, there was no apparent difference in PAC mechanisms across major evolutionary clades, with 75% of gymnosperms and 92% of angiosperms regulated by the combination of Nm and PNUE. There was a trade‐off between Nm and PNUE in driving PAC across species, and PNUE dominated the long‐term changes and inter‐specific differences in Asat under elevated CO2. These findings indicate that nitrogen‐use strategy drives the acclimation of leaf photosynthetic capacity to elevated CO2 across terrestrial plant species.

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“…This suggested that the nitrogen invested in the photosynthetic system of evergreen leaves (NE and BE) was relatively lower, and the remaining nitrogen was invested in non-photosynthetic systems such as cell wall proteins, lipids, and amino acids. More nitrogen was used in the construction of leaf tissue structure to make leaves tougher which enhanced the ability of evergreen plants to resist stress ( Mediavilla et al., 2012 ; Ghimire et al., 2017 ; Byeon et al., 2021 ). On the other hand, BD plants were completely on the contrary, and they increased the nitrogen investment in the photosynthetic system so that plants with shorter leaf life could assimilate as much carbon dioxide as possible at a limited time to ensure growth and development.…”

Section: Discussionmentioning

confidence: 99%

Leaf traits divergence and correlations of woody plants among the three plant functional types on the eastern Qinghai-Tibetan Plateau, China

et al. 2023

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Leaf traits are important indicators of plant life history and may vary according to plant functional type (PFT) and environmental conditions. In this study, we sampled woody plants from three PFTs (e.g., needle-leaved evergreens, NE; broad-leaved evergreens, BE; broad-leaved deciduous, BD) on the eastern Qinghai-Tibetan Plateau, and 110 species were collected across 50 sites. Here, the divergence and correlations of leaf traits in three PFTs and relationships between leaf traits and environment were studied. The results showed significant differences in leaf traits among three PFTs, with NE plants showed higher values than BE plants and BD plants for leaf thickness (LT), leaf dry matter content (LDMC), leaf dry mass per area (LMA), carbon: nitrogen ratio (C/N), and nitrogen content per unit area (Narea), except for nitrogen content per unit mass (Nmass). Although the correlations between leaf traits were similar across three PFTs, NE plants differed from BE plants and BD plants in the relationship between C/N and Narea. Compared with the mean annual precipitation (MAP), the mean annual temperature (MAT) was the main environmental factor that caused the difference in leaf traits among three PFTs. NE plants had a more conservative approach to survival compared to BE plants and BD plants. This study shed light on the regional-scale variation in leaf traits and the relationships among leaf traits, PFT, and environment. These findings have important implications for the development of regional-scale dynamic vegetation models and for understanding how plants respond and adapt to environmental change.

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Down-regulation of photosynthesis and its relationship with changes in leaf N allocation and N availability after long-term exposure to elevated CO2 concentration

Cited by 14 publications

References 61 publications

A global meta-analysis of woody plant responses to elevated CO2: implications on biomass, growth, leaf N content, photosynthesis and water relations

A global meta-analysis of woody plant responses to elevated CO2: implications on biomass, growth, leaf N content, photosynthesis and water relations

Nitrogen use strategy drives interspecific differences in plant photosynthetic CO₂ acclimation

Leaf traits divergence and correlations of woody plants among the three plant functional types on the eastern Qinghai-Tibetan Plateau, China

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Down-regulation of photosynthesis and its relationship with changes in leaf N allocation and N availability after long-term exposure to elevated CO2 concentration

Cited by 14 publications

References 61 publications

A global meta-analysis of woody plant responses to elevated CO2: implications on biomass, growth, leaf N content, photosynthesis and water relations

A global meta-analysis of woody plant responses to elevated CO2: implications on biomass, growth, leaf N content, photosynthesis and water relations

Nitrogen use strategy drives interspecific differences in plant photosynthetic CO2 acclimation

Leaf traits divergence and correlations of woody plants among the three plant functional types on the eastern Qinghai-Tibetan Plateau, China

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Nitrogen use strategy drives interspecific differences in plant photosynthetic CO₂ acclimation