SUBJECT LNDEX 



693 



Stomatal opening — Continued 



role of turgor of guard cells, 184, 

 186 

 Stomates, 



diffusive capacity of, 178-183, 188- 

 189, 205-206, 209, 289, 344-345> 



distribution in leaves, 176-178 



nocturnal opening of, 189-190, 2iO, 

 21 1 



number per unit area, 176-178 



size of, 175-177 



structure of, 157, 158, I74-I75 

 Stomates, sunken, relation to tranpira- 



tion, 203-204 

 Stone cells, 486 

 Streaming of protoplasm, 75, 502- 



504, 560 

 Suberin, 69, 396 

 Subsidiary cells, 175 

 Succulents, 299-300 

 Succinic acid, 535 



Sucrase, 322, 373, 374, 465, 469, 475 

 Sucrose, 321-322, 373-374 



permeability of cytoplasmic mem- 

 branes to, 121 

 Sucrose solutions, osmotic pressure of, 



99, 100 

 Suction tension (pressure, force), 148 

 Suffocation, 591 

 Sugars, 369-371 



relation to anthocyanin svnthesis, 



3^3, 

 Sugar-starch equilibrium, 386-388 

 Sulfur, role of, 420-421 

 Sulfur dioxide, effect on growth, 610 

 Surface tension, 23-26 

 Suspensions, 33, 34, 36 

 Syneresis, 58 



Tannins, 70, 386 

 Tartaric acid, 519 

 Temperature coefficient, 90 



of diffusion, 90 



of enzymatic reactions, 473 



of photosynthesis, 329, 330 



of respiration, 523 



Temperature, effect of, 



on accumulation of electrolytes, 



409 

 on anthocyanin synthesis, 383-384 

 on chlorophyll synthesis, 314 

 on cytoplasmic streaming, 75 

 on diffusion, 90, 92 

 on enzymatic activity, 466-467, 



472-473 

 on germination, 631 

 on growth, 589-591, 644, 646 

 on imbibition, 1 10 

 on nitrate reduction, 441 

 on opening of stomates, 187, 209 

 on osmotic pressure, lOO 

 on permeability, 123 

 on photosynthesis, 354-357 

 on respiration, 522-523, 527-528 

 on solubility, 8, 10 

 on starch-sugar equilibrium, 386- 



387 

 on surface tension, 25 

 on transpiration, 1 98-200, 209 

 Temperature of plant organs, 195- 



198. 354 

 Temperature of soil, effect of, 



on absorption of water, 280-282 



on transpiration, 281 

 Tendrils, 662-663 

 Tensile strength of cell walls, 68 

 Tension in water, 149, 234-235, 237- 

 241, 277-278, 294-295 



relation to diffusion pressure defi- 

 cit, 149, 234, 235, 278 

 Terpenes, 399 



Tetrasaccharides, 369, 374-375 

 Thermal absorption, 196-198 

 Thermal conduction, 196-197 

 Thermal emission (emissivity), 168, 



196-197, 201 

 Thermocouples, 195-196 

 Thiamin, 582 

 Thigmotropism, 662-663 

 Thixotropy, 58 

 Time factor, ^ 



in enzymatic reactions, 472-473 



in growth, 590 



