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Plant and Cell Physiology, 1982, Vol. 23, No. 5 745-750
© 1982

Article

The Influence of Chlorophyll on the Spectral Control of Elongation Growth in Chenopodium rubrum L. Hypocotyls

M. Geoffrey Holmes and Edgar Wagner

Institut für Biologic II Schänzlestraße 1, 7800 Freiburg, Federal Republic of Germany

The inhibitory effectiveness of various monochromatic wavelengths between 399 and 802 nm on hypocotyl elongation growth in light-grown Chenopodium rubrum L. seedlings has been studied. The responses of normal light-grown seedlings and chlorophyll-free light-grown seedlings were compared. Both types of seedling responded most strongly to the blue and red waveband although a distinct peak of red light effectiveness was not observed in normal green seedlings. The presence of chlorophyll also correlates with a lower inhibitory effectiveness of most wavelengths in the 400–700 nm waveband.

Photon fluence-rate response curves were not parallel; whereas the plants were very sensitive to changes in fluence-rate in the blue waveband, a much less marked fluence-rate dependency was observed in the red and far-red wavebands.

(Received September 10, 1981; Accepted April 26, 1982)
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