SUBJECT INDEX 



187 



Oxygen, 6 

 Oxygen pressure. 



50-1 



Paniciim iniliaceum (millet), 144 

 Papaver sp., 70 

 Parenchyma, 16 

 absorption by vacuoles in, 21 



structure of cells, 19 

 transport through, 117-20 

 Parsnip {see Pastinaca sativa) 

 Passage cells, 118 

 Passive absorption, 28-38 

 Pastinaca sativa (parsnip), 1 6, 77 

 Pea {see Pisum sativum) 

 Peach (see Prunus persica) 

 Pectic acid, 104, 143 

 Pectinic acid, 104,143 

 Pelargonium sp. (geranium), 1 22 

 Pelvetia canaliculata, 1 53 

 Pepper (see Piper sp.) 

 Peptides, 45 

 Pericycle, 1 5 



Permeability, 10, 16, 28, 45, 50 

 Permeases, 45 



pH (see hydrogen ion concentration) 

 Phaeophyceae (brown algae), 4, 152 

 Phaseolus vulgaris (bean, kidney bean), 



116, 125-6, 128, 129, 132, 150 

 Phloem, 9, 15, 125, 128, 132-3 

 Phosphate, 



absorption, 22, 49-51, 54-5, 57, 58, 

 69,84,86,88, 111-4, 116 



adsorption in soils, 138 



circulation in Phaseolus vulgaris, 

 128 



concentration in leaves, 125 

 in soil solutions, 136-7,140 

 in xylem sap, 121 , 124-5 



effects on salt absorption, 58 



exchange, 88 



in chloroplasts, 108 



incorporation in cell constituents, 

 39 



redistribution in plants, 111-2, 125- 

 7 



translocation in phloem, 128, 132 

 Phosphates, 6, 136-8, 140 

 Phosphatides, 8, 42, 45, 140 

 Phosphatidic acid, 87 

 Phosphoglyceraldehyde, 86 

 Phospholipids, 104 



Phosphorus, 



an essential element, 6 



compounds in xylem sap, 124-5 



content of plants, 3 



distribution in shoots, 125-8 



functions of, 7 



release in soil, 140 

 Phosphoryl choline, 124 

 Phosphorylase, 86 



Phosphorylation, 155 

 mechanisms, 85-8, 92 

 oxidative, 106 



Photophosphorylation, 108 

 Photosynthesis, 8, 48, 50, 5 1 , 1 1 5, 1 1 7 

 Physical absorption, 47-60 

 Physical mechanisms, 28-38 

 Physiological drought, 158 

 Phytin, 140 

 Piliferous layer, 15 

 Pilobolus sp., 20 

 Pine (see Pinus echinata) 

 Pinocytosis, 42, 164 

 Pinus echinata, 70 

 Piper sp. (pepper), 1 5 1 



Pisum sativum (pea), 4, 67, 70, 116, 

 128-30, 144, 151 



Plantago spp. (plantain), 70, 71, 156, 



157 



Plantain (see Plantago spp.), 



Plasmadesmata, 108 



Plasmalemma, 100, 104, 105, 107, 120 



Plasma membrane (see plasmalemma), 



Plasmolysis, 16, 21, 22, 63, 104 



Plutonium, 5 



Polarography, 23 



Polyuronides, 104 



Porphyra perforata, 18 



Potato (see Solamtm tuberosum) 



Potassium, 

 absorption, 35, 48, 50, 51, 53, 58, 

 60, 62, 63, 64, 66, 70, 71, 74, 90, 1 13, 



116, 144 

 an essential element, 6 

 binding in soils, 138-9 

 concentrations in, 



cell saps, 5,11,101-2,153 



sea water, 11, 1 54 



soil solutions, 136-7 

 content of plants, 3 

 effect on rubidium absorption, 58-9 



