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Maximizing Sugar Translocation in Plants: Sources, Sinks, and Experiments

Learn about how plants transport sugar from sources to growing parts through translocation. Explore experiments, sap chemistry, and the pressure-flow process. Discover the role of phloem and xylem in synthesizing new cells.

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Maximizing Sugar Translocation in Plants: Sources, Sinks, and Experiments

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  1. Translocation

  2. How the growing parts of the plant are provided with sugar to synthesize new cells

  3. Sources and sinks

  4. Multiple sources and sinks Developing apex

  5. Girdling experiments Radio active tracer experiments

  6. Aphids http://members.ozemail.com.au/~lblanco/Ap1.htm

  7. Typical Phloem Sap Chemistry Xylem and Phloem Sap Compositionsfrom White Lupine (Lupinus albus) Xylem Sap (mg/l)Phloem Sap (mg/l) Sucrose * Amino acids 700 Potassium 90 Sodium 60 120 Magnesium 27 85 Calcium 17 21 Iron 1.8 9.8 Manganese 0.6 1.4 Zinc 0.4 5.8 Copper Trace 0.4 Nitrate 10 * pH 6.3 7.9 http://forest.wisc.edu/forestry415/INDEXFRAMES.HTM

  8. Sucrose http://www.biologie.uni-hamburg.de/b-online/e16/16h.htm#sucr

  9. There are two parts to translocation:

  10. Pressure flow schematic The pressure-flow process Bulk Flow Fig. 30.18

  11. Fig. 30.18a, p. 527

  12. Diagram of loading

  13. Phloem structure Top

  14. Plasmodesmata

  15. Plasmodesmata Plasmodesmata

  16. Branched plasmodesmata Companion cell Cell wall Sieve element Longitudinal section between cells in the phloem including a branched plasmodesma. (Echium rosulatum petiole)  

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