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Contrasting effects of Miocene and Anthropocene levels of atmospheric CO₂ on silicon accumulation in a model grass.

ABSTRACT: Grasses are hyper-accumulators of silicon (Si), which they acquire from the soil and deposit in tissues to resist environmental stresses. Given the high metabolic costs of herbivore defensive chemicals and structural constituents (e.g. cellulose), grasses may substitute Si for these components when carbon is limited. Indeed, high Si uptake grasses evolved in the Miocene when atmospheric CO₂ concentration was much lower than present levels. It is, however, unknown how pre-industrial CO₂ concentrations affect Si accumulation in grasses. Using Brachypodium distachyon, we hydroponically manipulated Si-supply (0.0, 0.5, 1, 1.5, 2 mM) and grew plants under Miocene (200 ppm) and Anthropocene levels of CO₂ comprising ambient (410 ppm) and elevated (640 ppm) CO₂ concentrations. We showed that regardless of Si treatments, the Miocene CO₂ levels increased foliar Si concentrations by 47% and 56% relative to plants grown under ambient and elevated CO₂, respectively. This is owing to higher accumulation overall, but also the reallocation of Si from the roots into the shoots. Our results suggest that grasses may accumulate high Si concentrations in foliage when carbon is less available (i.e. pre-industrial CO₂ levels) but this is likely to decline under future climate change scenarios, potentially leaving grasses more susceptible to environmental stresses.

SUBMITTER: Biru FN

PROVIDER: S-EPMC7728683 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Contrasting effects of Miocene and Anthropocene levels of atmospheric CO₂ on silicon accumulation in a model grass.

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OmicsDI is part of the ELIXIR infrastructure

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Dataset Information

Contrasting effects of Miocene and Anthropocene levels of atmospheric CO2 on silicon accumulation in a model grass.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Contrasting effects of Miocene and Anthropocene levels of atmospheric CO₂ on silicon accumulation in a model grass.