694 



SUBJECT INDEX 



Time factor — Continued 

 in photosynthesis, 355-357 

 in respiration, 522-523, 540 



Tissues, 



primary, 217, 550 



secondary, 217, 219, 551, 559 



Tonoplast, 11 8-1 19 



Toxicity, 416, 419, 422, 423, 424, 



425> 427 

 Tracheids, 220, 221, 222, 223, 225, 



228-229, 236 

 Translocation of mineral salts, 481, 



491-497 

 Translocation of organic solutes, 

 downward, 481, 486-487 

 upward, 481, 487-491 

 Translocation of solutes, 

 lateral, 504-505 

 mechanism of, 498-504 

 rate of, 498, 503-504 

 relation of transpiration to, 166- 

 167 

 Translocation of water, see move- 

 ment of water 

 Transmission of light by leaves, 348, 



349 

 Transpiration, 156, 512 



daily periodicity of, 204-2 1 1 

 effect of atmospheric pressure on, 



202 

 efifect of cutin on, 202 

 effect of epidermal hairs on, 202- 



203 

 effect of humidity on, 194-195 

 effect of internal surface of leaves 



on, 203 

 effect of leaf structure on, 202-204 

 effect of light on, 192, 209 

 effect of soil temperature on, 281 

 effect of soil water conditions on, 



201, 210, 358 

 effect of structure of root system 



on, 204 

 effect of sunken stomates on, 203- 



204 

 effect of temperature on, 198-200, 



209 



Transpiration — Continued 

 effect of wind on, 200-201 

 in relation to absorption of salts, 



166-167 

 in relation to absorption of water, 



166, 277-278, 291-292 

 in relation to movement of water, 



166, 234, 241-242 

 in relation to translocation of sol- 

 utes, 166-167 

 magnitude of, 165-166 

 measurement of, 161-164 

 mechanics of, 156-159 

 role in dissipation of solar energy, 



167-169 

 seasonal variations in, 21 1 

 significance of, 166-169 

 Transport of solutes, see translocation 



of solutes 

 Traumatin, 582 

 Traumatotropism, 664 

 Trisaccharides, 369, 374 

 Tropisms, 653-654 

 Tuberization, effect of light duration 



on, 607 

 Turgor, 145 

 Turgor deficit, 148 

 Turgor movements, 654-655, 667-670 

 Turgor pressure, 95-96, 97, 145-151. 

 153, 293, 295, 499, 500, 501, 

 556-557, 667-669 

 Tyndall phenomenon, 41-42 

 Tyrosinase, 534 



Ultrafiltration, 41 

 Ultramicroscope, 42 

 Ultraviolet, 306 

 Ultraviolet, effect of, 



on enzymatic reactions, 476 



on growth, 600 

 Uptake of water, see absorption of 



water 

 Urea, 449 

 Urease, 449, 466, 477 



Vacuolar membrane, 118 

 Vacuole, 78-79 



