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Significance of Dark Reversion of Phytochrome in Flowering of Chrysanthemum morifolium

Authors :
H. M. Cathey
H. A. Borthwick
Source :
Botanical Gazette. 125:232-236
Publication Year :
1964
Publisher :
University of Chicago Press, 1964.

Abstract

Flowering of chrysanthemum (Chrysanthelmum morifolium Ramat ) is inhibited by a few hours of continuous or intermittent fluorescent or incandescent- filament illumination of low intensity. It is also inhibited by a 1-min fluorescent illuminance of a few hundred ft-c but not by one of several thousand from an incandescent-filament source. This difference in effectiveness of 1-min illuminances of fluorescent and incandescent light results from differences in their red-far-red energy ratios which are made even greater by chlorophyll screening in the leaf. Screening of red by chlorophyll tends to increase the amount of far red relative to red reaching phytochrome. Fluorescent light contains so little far red that screening does not cause a biologically significant change in the red-far-red ratio. In sunshine and incandescent-filament light, however, screening changes the ratio to such an extent that it can have striking biological consequences. The success of a 1-min fluorescent illuminance in preventing flow...

Details

ISSN :
00068071
Volume :
125
Database :
OpenAIRE
Journal :
Botanical Gazette
Accession number :
edsair.doi...........71cb08f394ffcbc23cddc7140c533dc3
Full Text :
https://doi.org/10.1086/336277