260 



GROWTH HORMONES IN PLANTS 



Geotropism, in roots, 199-211 



split-stem experiments, 189-192, 



192 

 statolith theory of, 181-182 

 stimulation and response, in 

 coleoptile, 171-178 

 in roots, 199-203 

 in stems, 188-189 

 and temperature, 204, 205 

 transmission of stimulus in, 173- 



174, 200-201, 174, 201 

 unequal distribution of growth 

 substance during, 179-181, 

 189-196, 208-211, 180, 193, 

 194 

 mechanism of displacement, 209 

 Gessner, F., 109 

 Glover, J., 53 



Gorter, C. J., 26, 58, 100, 207 

 Gradmann, H., 37, 87, 163, 190 

 Growth, and acid-growth reaction, 

 113-115, 114 

 in axial parts, 95-99 

 in buds, 117-118 

 in cambium, 122-123 

 and cell division, 103 

 of cell wall, by active growth, 

 108, 111-113 

 activity of growth substance in, 



104, 108-113 

 by apposition, 107 

 deposition of cellulose in, 104 

 elastic extension and growth 



substance, 108-109 

 hypotheses explaining, 107-113 

 by intussusception, 107, 11 1-113 

 plastic extension and growth 



substance, 109-111 

 structural basis for, 105 

 definition of, 1 



distribution of, in hypocotyls, 95, 

 97 

 in stems, 96 

 in foliage leaves, 93-95, 94 

 and growth substance distribu- 

 tion, 97-99 

 inhibition of, in buds, 117-118 

 in roots, 99-101, 115 



Growth, in petioles, 129 



in plants and plant parts, axial 

 parts, 95-99 

 buds, 117-118 

 cambium, 122-123 

 foliage leaves, 93-95, 94 

 petioles, 129 

 roots, 9^101, 115 

 tumors, 119-121 

 polarized, 83, 95 

 in roots, 99-101, 115 

 in tumors, 119 

 Growth substance, definition of, 3 

 similarity of, in root and cole- 

 optile, 205-207 

 various effects of chemical com- 

 pounds upon test objects, 

 43-55, 75 

 Gundel, W., 195 



Guttenberg, H. von, 62, 139, 147, 

 173, 182 



H 



Haagen-Smit, A. J., 15, 24, 33, 43, 

 51, 54, 59, 62, 63, 64, 65, 67, 

 69, 100, 102 

 Haberlandt, G., 129, 181, 200, 213 

 Haig, C, 135 

 Hamada, H., 17 

 Harder, R., 64 

 Hartelius, V., 102, 122 

 Hartmann, H., 184, 209 

 Hawker, L. E., 66, 204 

 Heidmann, A., 218 

 Helenium, 59 



Helianthus, 60, 62, 95, 103, 109, 113, 

 121, 122-123, 124, 184, 189, 

 191, 195, 196, 214, 61, 121 

 (See also Sunflower oil) 

 Heliopsis, 59, 60, 98 

 Heliotropism (see Phototropism) 

 Hennings, F., 123 

 Herzog, W., 188 



Heteroauxin (3-indole acetic acid), 

 derivatives, effectiveness of, 52 

 effectiveness of, 47, 49 

 preparation of, from urine, 47-49 



