Plant responses to carbon dioxide

Article Abstract:

Recent reports have suggested that studies of plant response to elevated carbon dioxide (CO2) levels using potted plants may be compromised by the effect of small rooting volumes. These reports have simply not gathered adequate data. A study of rooting space, soil nutrients and pot shape shows that CO2-induced growth is greatest with pots with high nutrient concentration. This held true irrespective of total nutrient content or pot volume. It was also found that pot shape influenced response.

Atmospheric carbon dioxide

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Universal scaling of respiratory metabolism, size and nitrogen in plants

Article Abstract:

Studies suggest that plant respiratory metabolism scales as the 3/4-power of mass and that higher plant and animal scaling follow similar rules owing to the predominance of fractal-like transport networks associated allometric scaling. The results are consistent with the notion of convergent scaling of metabolism to tissue N concentration, but are different than the 3/4-power scaling found for metabolism and body size in animals.

United States, Science & research, Plant metabolism

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Genome size and high CO2

Article Abstract:

Genome size may be one of the mediating factors in plant growth as related to increased atmospheric carbon dioxide concentrations. A positive correlation exists between cell size, cell cycle duration and genome size. Grasses only showed an advantage for large genomes in annual rather than perennial species but that may be due to an adaptation to overwintering or unavailable efficient carbon sinks.

Genetic aspects, Carbon dioxide, Genomes, Growth (Plants), Plant growth

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