Relation of CO2 Compensation Concentration to Apparent Photosynthesis in Maize 1

AUTOR(ES)

Heichel, Gary H.

RESUMO

Significant differences in CO2 compensation concentration measured in the field among varieties of the species Zea mays L. are reported for the first time. CO2 compensation concentrations were significantly (P≤ 0.01) and negatively correlated with apparent photosynthesis at 300 μl CO2/liter air. The Michaelis constant (as defined) for a leaf was significantly (P≤ 0.01) and positively correlated with apparent photosynthesis among varieties. While the first correlation is similar to behavior of CO2 compensation among species of different photosynthetic efficiency, the latter correlation is the converse of the behavior of Km among species.

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