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Interrelation of Light and Darkness in Photoperiodic Induction

Karl C. Hamner
Botanical Gazette
Vol. 101, No. 3 (Mar., 1940), pp. 658-687
Stable URL: http://www.jstor.org/stable/2472399
Page Count: 30
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Interrelation of Light and Darkness in Photoperiodic Induction
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Abstract

1. Experimental work has been presented on the effect of various cycles of light and darkness on photoperiodic induction of Biloxi soybean, Xanthium, dill, and beet. 2. Experimental evidence has indicated that in both the soybean and Xanthium photoperiodic induction is dependent in part upon responses which occur as the result of exposure to light. For purposes of discussion, these responses have been referred to as A. 3. Experimental evidence has indicated that in both Xanthium and soybean photoperiodic induction is dependent in part also upon responses which result from exposure to darkness. For purposes of discussion, these have been referred to as B. Photoperiodic induction results only after periods of darkness which exceed a certain minimum length. 4. For convenience and brevity of reference, the changes or conditions related to exposure to light may be designated as A, those owing to darkness as B, and the resultant changes related to A and B may be referred to as C. 5. The establishment of the categories A, B→C as here suggested is an aid toward an interpretation of the behavior of Xanthium and Biloxi soybean. Its extension to the interpretation of the photoperiodic behavior of other plants may be possible. 6. Additional experiments, so performed that they may be subjected to such a type of analysis, are in progress.

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