Abstract
SummaryWhen CO2 is withheld from the leaves of Lavatera cretica L., the normal phototropic tracking response to an oblique light source becomes weakened within 60 min and after 2 h is eliminated altogether. If CO2 is also withheld throughout a preceding 24 h dark period, even the initial tracking response in the light under carbon dioxide deprivation is eliminated. Normal tracking resumes in both cases when CO2 is again provided. Alternating directions of oblique illumination, under normal atmospheric CO2 levels, produce a synchronized response cycle with a short phase lag, but carbon dioxide deprivation results in the adoption of a neutral intermediate position. The results are in accord with the hypothesis that uneven distribution patterns in photosynthetic activity, resulting from the oblique illumination of the lamina, lead to the pulvinar turgor gradients responsible for suntracking movements in this species.
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