Abstract
The displacement by centrifugation of the cell contents of wheat (Triticum aestivum L. cy. Weibull's Starke) was studied after various light treatments. In dark‐grown leaves the viscosity of the cytoplasm, measured as the time necessary to displace the cell contents, is low, but increases slowly during continuous red irradiation as well as after a short red pulse. The increase after a red light pulse can be nullified by a short far‐red irradiation which in itself has no effect. Unlike that found earlier for Elodea densa Casp., and verified in the present study, the cytoplasm of wheat leaves does not show any rapid response to blue light, not even after pretreatment with red light.
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