894 



SUBJECT INDEX 



Leaf growth (Continued) 



interaction of light and chemicals 

 on, 163-178 



of lettuce, 120-123 



photoreversible control of, 161- 

 178 

 Leaf hoppers 



photoperiodism in, 602 

 Leaf movements 



diurnal, 511,518-520, 533 

 Lepidoptera 



photoperiodism in, 602 

 Lettuce, 120-125 



heading as affected by light in- 

 tensity, 119 



leaf shape, see Leaf 

 Leydig 



cells of, 735, 740 

 Light 



absorption, 22, 23 



effect of artificial light on breed- 

 ing, 642 



effect of incandescent light on 

 tomato plants, 126 



effect on Citellus, 801 



effect on germination, 91-98 



effect on Gonyaulax rhythms, 

 574, 577-580 



effect on mammal activity 

 rhythms, 794-797 



effect on stem growth, 217-221 



influence on diurnal periodicity, 

 517-519,522,523 



interruption of night by, 246 



morphogenetic effects in Avena 

 coleoptiles, 126 



morphogenetic effects in tomato, 

 126, 127 



perturbation by, 578, 579 



promotion and inhibition of germ- 

 ination by, 90, 91 



reflection of, 22, 23 



scattering of, 22, 23 



spectral effects of, 119-123, 125- 

 127, 218, 219 

 m Avena, 125, 126 

 in lettuce leaves, 1 19-123 

 transmission of, 22 

 Light-break effects, 522, 531-533, 



537-539 

 Light 



continuous 



effect on diapause in Culex 



pipiens, 602 

 effect on quail, 753 

 Light emission 



by dinoflagellates, 567 

 Light intensity, 125 



effect on algal growth and pigment 



formation, 37 

 effect on Gonyaulax rhythm, 578- 



580 

 effect on lettuce leaf shape, 119- 



124 

 measurement of, 605 

 Light-intensity experiments 



design of, 604 

 Light intensity 

 threshold of 



producing sperm and eggs, 75 1, 

 752 

 Long-day plants, 245-247, 249, 

 354-356, 374-376 

 differences in the behavior 

 towards colored light and white 

 light of different sources, 353 

 effect of far-red light on, 352 

 effect of red light on, 352 

 influence of auxin on photoperi- 

 odic induction, 337-340 

 Long-day treatment 



effect of flowering, 395, 401 

 effect on leaf growth, 401 

 effect on stem growth, 401 

 spectral dependence, 101, 103 

 Long-short day plant, 3 1 6-3 1 8 



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