452 



SUBJECT INDEX 



Dormancy in seeds — continued 

 Impaliens balsainina, 123-12t) 

 inconveniences toman, 70-71 

 lettuce, 399-400 

 Leu'isia rediinva, 127 

 light effects on germination, 7-t-78 

 low temperatuie eftects, 86-123 

 oxygen requirement for germination, 78-85 

 Polygonatum commutatum, 120-121 

 quick vitality tests, 128-131 

 Sanguinaria canadensis, 120-121 

 seed coat effects, 46-47, 71-74 

 seeds requiring two low-temperature exposures, 



119-123 

 significance, 67—68 

 Sinilacina racemosa, 120-123 

 sulplmric acid effects, 106-112 

 Symphoricarpns orbiculatus, 108-109 

 temperature effects, 48-49 

 temperature effects on wild plants, 41-43 

 temperature requirements for germination, 127- 



128 

 Trillium erectum, 120-121 

 Trillium grandiflorum, 119-121 

 types, 71-128 

 Viscum, album, 123 

 water absorption in Amaranthus seeds, lettuce 



seeds, Rumex seeds, 126 

 Dormancy in seeds, epicotyl: in Chionanthus rir- 



giniana, 118 

 in Symplocos paniculata, 118 

 in tree peony, 113-117 

 in yibur««m, 113, 117-118 

 Dormancy in seeds, primary and secondary: in 



cocklebur, 47-48 

 Dormancy in seeds, secondary: in Ambrosia trifida, 



46-47 

 in Nigella saliva, 45 

 Dormancy in tubers, 230-256 



Drip oils: effects on growth of tomato plants, 178 

 Duck-food plants: ecological and physiological 



studies on certain aquatic plants, 15-26 

 economic loss due to destruction of certain 



aquatic plants, 25 

 restoration of aquatic plants, 25-26 

 sea-water tolerance, 20 

 Duck-food problem: study of aquatic plants, 15- 



26 

 Dwarf seedlings: grown from plants with dormant 



embryos, 93-97 



Electrodes: capillary glass electrode, 437 

 Emanations from soil treated with mercury com- 

 pounds: effects on plants, 180-185 

 Embryos, dormant: chemical and physiological 

 changes during low-temperature after-ripen- 

 ing, 97-101 



physiological studies, 86-101 

 Embryos, non-dormant: germination, 101-105 

 Energy: received and lost by leaves, 329 

 Entelea, 30, 31 



Enzymes: (See name of enzyme) 

 Epicotyl dormancy in: seeds, 113-119 

 Epilachna variveslis: black pepper toxicity, 354 

 Epilobium, 75, 76 

 Epinasty: gas effects on leaves, 143-148 



plant tissue emanations effects, 164-166 



volatile chemicals effects, 143 

 Epinasty produced: by capping of plants, 226 



by growth substances, 209-210 



by irradiated cinnamic acid, 226 

 Erechtites, 36, 38 

 Ervum, 29 

 Escherichia coli, 197 

 Ethane: injury to plants, 179-180 

 Ethyl bromide: effects on dormant potato tubers, 

 243 



Ethylene: anesthetic effects on plants, 1.50-158 

 detection by plant response, 141-143 

 physiological effects on plants, 139-168 

 production by plant tissues, 164-166 



Ethylene chlorohydrin: hastening the sprouting of 

 dormant potato tubers, 231-233 



Ethylene chlorohydrin effects on : amylase activity, 

 250 

 ascorbic acid production in potatoes, 252 

 citric acid content of Bryophyllum leaves, 250 

 dormancy in gladiolus cormels, 241-243 

 dormant gladiolus corms, 240 

 enzyme activities in potato tubers, 250-251 

 /3-glucoside formation in living tubers, 246-247 

 metabolism of dormant potato tubers, 246-249 



Ethylene dichloride effects on: dormant potato 

 tubers, 234 



Ethylene effects: abscission, 150 

 epinasty of leaves, 143-148 

 on carnations, 139-140 

 on celery, 159 



on color and ripening of fruits, 158-159 

 on metabolism of plant tissues, 1.59-160 

 on rooting, 163 

 on roots, 173 

 proliferation of tissues, 148-150 



Eucalyptus, 33 



Euphorbia, 30 



Eutaxia, 30 



Evonymous: as affected by growth substances, 213 

 response to a-indolebutyric acid, 210-211 



Experimental planning and statistics, 437-439 



ricus, 14 



Field trials with fibre pots, 438 



Flowering: artificial light effects, 300-.309 



effects of gases, 164 

 Flowers: carlion dioxide storage effects, 399 

 Fluoreneacetic acid, 207 

 Fruit drop, apple: as affected by growth substances, 



215 

 Fruit ripening: ethylene effects, 15,8-159 

 Fruit set: as affected by growth substances, 218-220 

 Fruits: carbon dioxide storage effects, 399 

 Froghopper: (See Philaenus leucopht halnius) 

 Fztchsia, 144 



Fumigation: /3,/3'-dichloroethyl ether, 353 

 gases, 353 



naphthalene, 352-353 

 Fumigation chambers: to study sulphur dioxide 



effects on animals, 192-193 

 Fungi: for determining soil fertility, 428 



oxygen requirements for formation of perithecia 

 and mycelial growth, 435-436 

 Fungicidal: definition, 372 

 Fungicidal action: of copper, 366-369 



of sulphur, 362-366 r 



Fungicides: causes of variation in spore germination 

 tests, 371-372 

 comparative toxicity of sulphur, selenium and 



tellurium, 365-366 

 correlations between laboratory and greenhouse 



tests, 379-380 

 cumulative error terms, 379 

 glyoxalidine derivatives, 381-383 

 greenhouse methods of evaluation, 374-379 

 organic compounds, 381-383 



settUng tower method of applying fungicides, 374 

 spore germination tests, 369-374 

 standard slide-germination method of evaluating, 



374 

 toxicity as related to position of elements of com- 

 pounds in periodic system, 380 

 toxicity curves, 370-371 

 toxicity surface, 370 

 Fungistatic: definition, 372 



