272 



Plant Tissue Culture 



Faah 210, 219, 254 



palisade cells, cultivation of, 20 



Palladin, 104, 260 



parasites, facultative and obli- 

 gate, cultivation of, 194, 199- 

 202 



parenchyma, cortical, medullary 

 ray, xylem, retention of meri- 

 stematic function, 43, 44, 58 



Parker, 29, 67, 71, 75, 119, 131, 

 133, 143, 148, 149, 151, 152, 

 158, 210, 229, 258; Fischer 

 and P., 143, 210, 257 



pathogens, facultative and obli- 

 gate, cultivation of, 194, 199- 

 202 



pathology, 194 et seq. 



patterns, developmental (mor- 

 phogenetic), 7 



pea root, 105 



pea seeds, digest of, as nutrient, 

 31 



peaches, hybrid, 45 



Pearsall and Priestley, 217, 250 



Pelece; Thielman and P., 99, 

 244 



pellicle, of animal cell, mobility 

 of, 11 



pellicle, of plant cell, rigidity of, 

 9 



Teperomia, 28 



Peperomia hispidula, 46, 47, 260 



Feperomias, undifferentiated 

 embryos in, 46, 47 



pepsin, 101 



peptic digests, 90, 101 



peptone, in nutrients, 31, 101 



percentages, use of 172, 173 



pericycle, retention of meriste- 

 matic function by, 43, 125 



Petri-dish cultures, 132 



petroleum oil, toxicity of, 92 



Pfeiffer, 28, 148, 235, 260 



pH, 57, 218 



phagocytosis, 11 



phanerogamic parasites, 202 



rhaseolus vulgaris, 242 



phelloderm, as material for cul- 

 tures, 125 

 phellogens, 48 



Phillis; Mason and P., 94, 260 

 phloem exudate, as nutrient, 27 

 phloem parenchyma, meriste- 



matic character of, 43 

 phloem sap, 9 

 phosphatase, 184 

 phosphates, 112 

 phosphorus, 92 

 photosynthesis, 20, 189 

 phototropic response, role of 



auxin in, 210 

 phyllocalines, 212 

 physiologically sterile plants, 45, 



220 

 pierced slide, 80, 81, 82, 149 

 pigmentation of amphibian em- 

 bryos, 14, 15 

 pine, cultivation of cambium of, 



123 

 Tisum, 28 

 pith, meristematie capacity of, 



43, 58 

 pith cells, cultivation of, 20 

 placental tissue, cultivation of, 



58 

 planimeter, use in measuring 



growth, 158 

 plant extracts, toxicity of, 27 

 PlantefoL 189, 246; P. and 



Gautheret, 189, 246 

 plasma, use as nutrient, 21, 90 

 plasmolytic value, 94 

 plasmoptysis, 182 , 194 

 plastids, 193 



plumule, rooting of, 48, 50 

 polarity, 5-7, 217, 218 

 polyembryony, causes of, 220 

 Folypodium, 28 

 poplar, cultivation of cambium, 



123 

 Populus nigra, 19 

 Fortulaca oleracea, cultivation 



of embryos, 54 

 potassium, 92 

 potassium, effect of deficiency 



of, 188 



