234 



THE FLOWERING PROCESS 



Spectrum 102 



Spores 129 



Spur branches 95 



Stabilization of hormone 187 



Stadial development theory 49, 64 



Stages of floral development 88 



Staminate flowers 192 



Starlight 28 



Statistics 80 



Substance E 62 



Succinic acid 167 



Succulency 109, 130 



Sucrose 217 



Sugar 56, 99, 173, 185, 187-90, 196 



Summer 165, solstice 35 



Sunlight 27-8, 73 



Symbols, response type 14-22, 207-15 



Synthesis of flowering hormone 158- 

 83, 181, 203, chemicals aff"ecting 

 173-5, critical night 175-6, 179-80, 

 leaf growth 159-62, night length 

 158-9, summary 182-3, temperature 

 eff"ects 162-6 



Taxonomy 1 



Temperature: critical night 147, com- 

 pensating reactions 137, eff"ects on 

 flowering 5-6, 16-21, 24-5, 46-71, 

 following dark period 181, growth of 

 cocklebur 74-5, independence (tim- 

 ing) 39, 135-7, 141, 146-7, trans- 

 location 184-5 



Thermoperiodism 128, 131-2 



Thioproline 172 



2-Thiouracil 172 



Threshold light: bean hook response 

 28, critical night 144-6, photomor- 

 phogenesis 28, photoperiodism 118, 

 phototropism 28 



Thymidine 168, 174, 198 



Time of: application, chemicals 169- 

 72, 182, illumination (reciprocity) 

 113, sunrise 36, year 35-9 



Timing (time measurement) : chemicals 

 (cobaltous ion) 173, critical night 2, 

 6-7, 176, mechanism 117-8, 136-7, 

 203, phytochrome 109, problems 

 148-51, temperature independence 

 39 



a-Tocopherol 196 



Total growth 96 



Touching cocklebur leaf 161 



Tracer studies 175 



Transformation 8, 199, 202-3 



Transition zone 200-1 



Transits 151 



Translocation of flowering hormone: 

 187-90, chemicals applied during 

 169-72, 176-9, eff"ects of light condi- 

 tions on 187-90, rate 154-5, 184, 

 time 176, with assimilates 156-7 



Trimming plants 76, 78 



Tuber formation 130, 190 



Tuber-inducing principle 57 



Tunica 200-1 



Tuning fork 136 



Turntables 150 



Twilight 30-5, 118 



U 



Ultra-violet light 27 

 Uniformity 1-3, 8, 42-3, 203 

 Uracil 168, 171-2, 174 

 Urethane 150 

 Uridine 172 



Vegetative growth 63, 130 



Vernalin 54-6, 61, 66 



Vemahzation 18, 20, 46-66, 198-9, 

 203, condition of plant 52-3, defini- 

 tion 46-7, 67, extracts and gibberel- 

 lins 57-63, theory 63-6, historical 47- 

 50, interactions with day length 57, 

 response types 50-1, oxygen 56, site 

 of cold perception 51-2, tempera- 

 tures 53-4, times 54, substrate 

 requirements 56-7 



Visible light spectrum 25-6, 104 



W 



Wetting agent 83 

 Winter 25, 27 

 Winter annuals 10 

 Woody plants 10 



Xenon arc lamp 82 



