contents 



► 



chapter one ► Background 



MORPHOLOGY OF FLOWERING 1 



NATURAL HISTORY OF FLOWERING 

 THE MEASUREMENT OF FLOWERING 



chapter two 



► Photoperiodism: An Outline 10 



DEFINITIONS OF PHOTOPERIODISM 10 



HISTORICAL NOTE 11 



GIANT TOBACCO AND SEPTEMBER SOYBEANS 12 



KINDS OF PHOTOPERIODIC FLOWERING 



RESPONSES 13 



THE ROLE OF LEAVES IN PHOTOPERIODISM. 



PHOTOPERIODIC INDUCTION 17 



THE CENTRAL ROLE OF THE DARK PERIOD 18 



REQUIREMENTS FOR HIGH-INTENSITY LIGHT 20 



MUTUAL INTERACTIONS OF LIGHT AND DARK 



PERIOD LENGTHS 22 



INTERACTION OF DIFFERENT PHOTOPERIODIC 



cycles: FRACTIONAL INDUCTION IN LDP 



AND LONG-DAY INHIBITION IN SDP 24 



PHOTOPERIODISM AND TEMPERATURE 25 



PHOTOPERIODISM AND VEGETATIVE GROWTH 27 



LITERATURE 29 



chapter three ► Photoperiodism: Attempts at Analysis 



A. Photoperiodism and light quality 30 



ACTION SPECTRA FOR LIGHT-BREAKS 30 



30 



IX 



