Water in Plants 



— 237 — 



Subject Index 



in liquid systems, 46-48 

 kinetic basis of, 45-46 

 mechanism of, 43-58 

 osmotic pressure and, 32-42 



role of, 57 



"solvent" and "solute" pressure theories of, 

 52-54 

 Osmotic adaptation, 127 

 Osmotically-inactive material, 136 

 Osmotic diflFusion pressure, SO 

 Osmotic pressure, at limiting plasmolysis, 89, 

 101, 112, 116, 123, 126, 131 



at normal cell volume, 112, 115, 116, 126, 131 



Barger-Halket method, 96, 113 



Bombardment, theory of, 33 



by replasmolysis (ROg), 116 



capillarimetric method, 96-97, 113 



cryoscopic method, 90-95, 99, 116, 129-130 



defined, 43 



discrepancies in methods of detg., 111-117, 

 118 



DPD and, SO, 51, 52, 105, 106, 163 



effect on dark reaction, 201 



effect on transpiration, 194 



equation of, 18, 32, 33, 34 



influence of atmosphere on, 48 



in soils, 1S3-1S4 



internal water movement and, 172, 173 



law, refinement of, 33-40 



magnitude and variation in plants, 99-101 



manometric detn. of, 146 



methods of measuring, 81-98 



minimum cell volume method, 97 



osmometric method, 32-39, 97 



plasmolytic method, 81-89, 99, 116 



plasmometric method, 89-90 



simplified method, 97, 98, 99 



soil, and water absorption, 149 



"solute pressure" theory of, 33, 53 



"solvent pressure" theory of, 33, 54 



turgor pressure and, 107, 108 



vapor pressure equation, 28, 44 



vapor pressure methods, 95-97 



vapor pressure theory of, 33 

 Osmotic pressure values, 



of plants, 99-134, 203 



of solutions, 32-39, 100 



of xylem and phloem exudates, 100 

 Osmotic quantities of plant cells, 73-110 

 Osmotic value, 100 

 Osmotic work, 124, 135 

 "Oxidized collodion," 144 

 Oxygen, root pressure and, 149-150 



subaqueous transpiration and, 205 



thermal properties of, 4 



Palladium, as a membrane, 46 

 Pantothenic acid, translocation of, 177 

 Paraffin oil, in DPD detn., 102 



leaf wall wettability with, 193 



stomatal studies with, 197 

 Parenchyma, OP of, 99, 100 

 Parthcnocissus qu in qui f alius, OP of, 118 

 Partial molal volume, 23 



PCD isee Plasmolytic-cryoscopic discrepancy) 

 Peanut, moisture content of, 62 

 Pectin, in vacuoles, 69 

 Pentahydrate, 27, 37 

 Peptide linkages, 66-67 

 Permanent wilting, 153 



and transpiration, 160 

 Permanent wilting percentage, 206 



water absorption at, 148 

 Permanent wilting point, defined, 152 



soil texture and, 152 

 Permeability, membranes and, 77-81 



of cell walls, 81 



water absorption and, 149 

 Petroleum, stomatal studies with, 197 

 Petroleum ether, stomatal studies with, 197 



pH, and sugar-to-starch transformation, 202, 



203 

 Phaeophyceae, plasmolytic studies of, 85 

 Phaseolus, cryoscopy of, 132 



rate of sap flow in, 169 

 Phenoxyacetic acid, 4-chloro-, 177 



2,4-dichloro-, 177 

 Phloem, exudate, 100, 175 



exudation and Schlieren method, 165 

 translocation in, 174-177 

 Phosphatase, water deficit and, 201 

 Phosphorus, use in sap flow expts., 169 

 Photosynthesis, water deficit and, 201, 206 

 Picea, rate of sap flow in, 171, 172 

 Pigment production, 201 

 Pinus laricio, adhesion pressure in, 83 



plas.-cryos. discrepancy, 115 

 Pinus rigida, cryoscopy of, 91 



cold hardiness in, 120, 121 

 Pistia texeris, internal air space in, 194 

 Pith, OP of, 100 

 Plasmalemma, 78 

 Plasmolysis, anomalous, 124 



chlorophyll production and, 201 



forms, 87-88, 125 



incipient, 82 



limitations of method, 82-85 



limiting, 82 



stimulative, 88, 124 

 Plasmolytic-cryoscopic discrepancy, 111-117, 



123, 126, 134 

 Plasmolytic method, exptl. procedure, 85-87 



limitations of, 82-85 



measurement of OP, 81-89 



uses other than for OP, 87-89 

 Plasmolyzing agents, 82-83 

 Plasmometric method, measurement of OP by, 



89-90 

 Plasmoptysis, 108 



Plastic stretching of cell wall, 84, 140 

 Pleurococcus, 61 



POg (OP at the first lim. plasmol.), 115, 116 

 Poinsettia, wilting of, 185 

 Poisouille's law, 157 

 Polar liquids, 7-8 



Polar molecules, properties of, 7-8 

 Polar movement, translocation and, 175 

 Polarizability, 21 

 Polygonum officinale, 124 

 Polypeptide chains, 66-67 

 Polyuronides, 79, 192 

 Porometer, 196-197 

 Porter's equation, 35 



Potamogeton crispus, water movement in, 203 

 Potamogeton lucens, water movement in, 204 

 Potassium, bromide, and water absorption, 128 



chloride, effect on cell water relations, 144 



fumarate, in cell water relations, 128 



in cell water relations, 128 



ion, membrane permeability to, 144 



nitrate, as plasmolyzing agent, 82 



OP values of solutions of, 100 



sulfate, 131 

 Potato, auxin and water uptake, 127-128 



DPD of tuber of, 104, 131 



solute accumulation in, 139 



volume changes in, 98 



water content of tuber, 62 



water in phloem walls, 65 

 Potometer, method of DPD detn., 104-105 



pressure difference measured by, 163 



tension measurement with, 162-163 



transpiration detn. with, 186 

 Pressure, adhesion, 82-84, 114-116 



diffusion (see Diffusion pressure) 



equation of state, components of, 19-20 



functional, 50 



gas, 32, 33 



intercellular, 102 



