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Dose response behaviour for polarotropism of the germ tube of the liverwortSphaerocarpos Donnelliiaust.

✍ Scribed by A. M. Steiner

Publisher
Springer-Verlag
Year
1969
Tongue
English
Weight
464 KB
Volume
86
Category
Article
ISSN
0032-0935

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✦ Synopsis

The dose response behaviour for polarotropism of the unicellular germ tube of Sphaerocarpo~ was studied in blue and near UV. At constant intensities the response is proportional to the logarithm of the exposure duration, and at constant exposure durations the response is proportional to the logarithm of intensity. Neither a polarotropic response to wavelengths > 550 nm, nor a significant influence on response to blue of a pre-, post-, or simultaneous-irradiation with red or far-red could be observed. Also a dark period was without any effect on the polarotropic response to blue. Growth responses under linearly polarized light are described.

wavelength visible irradiation might be of help ~or the further elucidation of the processes involved in blue-UV-mediated photoresponses.

Material and Method

Material. The male and female gametophytes of Sphaerocarpo8 donnellii AVST.

were grown separately on soil in a green house at a temperature of 17--20 ~ C. Fertilization was performed in January 1961 and the ripe sporogones were bar-

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