Variables Affecting the CO2 Compensation Point 1

AUTOR(ES)

Smith, E. Wayne

RESUMO

Some factors influencing dark respiration, photorespiration, and photosynthesis were examined for their effect on the CO2 compensation point (70 μl/l) of detached soybean (Glycine max) leaf discs. A higher compensation point in young leaves decreased to the constant value after leaf expansion and maturation, but increased again during senescence. The compensation point was 40 to 50% higher in plants grown in the summer than in the winter. The compensation point and dark respiration increased with temperatures above 17 C. Below 17 C dark respiration continued to decrease, but the compensation point did not decrease further. Increasing light intensities did not affect the compensation point.

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