Abstract
`Midway' and `Raritan' strawberry cultivars were grown for six weeks under ambient (350) or twice ambient (700 μmol mol-1) CO2 Photosynthetic inhibition (40-50%) was observed in both cultivars as indicated by reductions (P < 0.001) in CO2 assimilation, carboxylation efficiency, stomatal conductance, and apparent quantum yield. Growth under high CO2 did not affect Rubisco activity in either cultivar, whereas Rubisco activation state (%) was reduced (72.9 to 67.6) in `Midway' and increased (70.8 to 83.3) in `Raritan' compared to ambient CO2 grown plants. Soluble and Rubisco protein decreased 10-15% in `Midway' and 40-45% in `Raritan' when grown under high CO2 Thus, `Raritan' reduced the amount of protein partitioned into photosynthetic enzymes under conditions of photosynthetic inhibition, whereas `Midway' experiences Rubisco deactivation. The reduction in Rubisco protein appears to be under the regulation of chloroplast genes.
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