Transport in Plants I: Phloem TransportM.H. Zimmermann, J.A. Milburn When WILHELM RUHLAND developed his plan for an Encyclopedia of Plant Physiol ogy more than three decades ago, biology could still be conveniently subdivided into classical areas. Even within plant physiology, subdivisions were not too difficult to make, and general principles could be covered sufficiently in the two introductory volumes of the Encyclopedia on the physical and chemical basis of cell biology. But the situation changed rapidly even during the 12-year publication period of the Encyclopedia (1955-1967). The new molecular direction of genetics and structural research on biopolymers had an integrating effect on all other biological fields, including plant physiology, and it became increasingly difficult to keep previously distinct areas separated. RUHLAND'S overall plan included 18 volumes and about 22,000 pages. It covered the entire field of plant physiology, in most cases from the very beginning. But, as each volume appeared, it was clear that its content would soon be outdated. |
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SieveElement Structure | 3 |
Gymnosperms 21 Vascular Cryptogams | 24 |
F Conclusion | 32 |
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14C-labeled 14C-sucrose activity aphid assimilates bark Biol bleeding Botany bundles callose CANNY carbohydrates companion cells concentration Cucurbita maxima Cucurbita pepo cytoplasm dicotyledons effect electroosmosis enzymes ESAU ESCHRICH EVERT Exptl exudate crude FENSOM filaments function GEIGER Heracleum honeydew inflorescence inhibition inhibitors ions KENNECKE KLUGE labeled leaf leaves lumen mass flow mechanism membrane mesophyll metabolism minor veins movement MÜNCH observed occur osmotic P-protein parenchyma parenchyma cells PEEL petiole phloem exudate phloem loading phloem sap phloem transport photosynthesis Plant Physiol plasmalemma plasmodesmata potassium pressure flow protein ray cells Ricinus Robinia roots sieve cells sieve plates sieve tubes sieve-plate pores sieve-tube exudate sieve-tube sap sink solutes SPANNER species starch stem strands structure studies stylet stylet exudate substances sucrose sugar beet TAMMES temperature Tilia tissue tr tr tracer translocation translocation rate trees turgor uptake vascular velocity Vicia faba WEATHERLEY willow xylem Yucca flaccida ZIEGLER ZIMMERMANN