188 



SUBJECT INDEX 



Potassium — cont. 



functions of, 7-8 



ion fluxes, 102 



transport in xylem sap, 121, 124 



transport out of cotyledons, 128-9 

 Potomogeton spp. , 2 1 , 50, 84 

 Pousseuille's law, 30 

 Propelled carriers, 43 

 Proteins, 



ion adsorption by, 8, 35, 38 



role as ion carriers, 42, 45, 89, 163 

 Protein synthesis, 17, 67, 87-90, 164 



turnover, 88, 164 

 Protophloem, 15 

 Protoplasm, 19,88,95-7 

 Protoplasmic organelles, 106-8 



streaming, 89, 163 

 Protoxylem, 1 5 

 Prunus armeniaca (apricot), 124 

 PrunuspersicaipQdiCh), 150 

 Pyridoxal, 39, 45 

 Pyrus communis (pear) , 1 24 

 Pyriis malus (apple: see Mains 

 sylvestris) 



Q 



QiQ {see temperature coefficient) 



R 



Radioactive isotopes, 4, 22, 24-5, 32, 



95-6, 101, 111-3, 122, 128, 142 

 Radioactivity, measurement of, 24-5 

 Radish {Raphamts sativus) 

 Raphatms sativus (radish) 

 Red algae {see Rhodophyceae) 

 Red beet {see Beta vulgaris) 

 Redox potential, 22 



potential gradient, 78-9 



pump, 84-5 

 Respiration, 8, 11-2, 65, 73, 77-8, 



80-2, 100 

 Rhododendron spp., 146 

 Rhodophyceae, 1 52 

 Rhodymenia palmata, 103, 153 

 Ribonuclease, 64, 165 

 Ribonucleic acid, 45, 50, 164-5 

 Rice {see Oryza sativd) 

 Ringing experiments, 67,122 

 Root, 



culture, 14 



hair zone, 15,111 



pressure, 117,120 



Roots, {see also excised roots) 

 apparent free space of, 98-9, 118 

 cation exchange capacity of, 143-4 

 structure of, 1 5 



transport across cortex of, 9, 14, 

 117-22 



Rotating carriers, 43 

 Rubidium, 

 absorption of, 55-6, 58-9, 61-2, 66, 



70,113,143 

 concentration in xylem sap, 1 2 1 

 transport into the shoot, 123, Plate 

 II 

 Ruppiaspp., 155 

 Rye {see Secale cereale) 



Saccharum officinale (sugar cane), 



112, 114 

 Salicornia spp. (glasswort, marsh 



samphire), 70,155-7,159 

 Salix sp. (willow), 1 , 122 

 Salsoli kali, 70 

 Salt, 



glands, 9, 159-62 



respiration, 77-8,81-3 



tolerance, 149-62 

 Salts {see mineral salts) 

 Sanchezia nobilis, 114-5 

 Saxifragaceae, 133 

 Scenedesmus obliquus, 7 

 Sea aster {Aster tripolium). 

 Sea plantain {see Plantago spp.) 

 Sea water, salt composition of, 11, 



153-4 

 Seaweeds, 4, 59, 60 

 Secale cereale (rye), 56-7, 116 

 Secretion, 27 

 Selectivity, 



of absorption, 10, 57-8, 60, 70, 84 



of transport into shoots, 1 20-2 1 

 Seienate, 3, 58 

 Selenium, 4, 71 

 Senescent tissues, 68 

 Shoot, 



influence on absorption by plants, 

 14 



movement of salts into, 122-4, 

 Plate II 

 Sieve tubes, 127 

 Silicon, 3, 7 



