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Plant Physiology 100:1433-1441 (1992)
© 1992 American Society of Plant Biologists

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Cellular and Structural Biology

Turnover of Soluble Proteins in the Wheat Sieve Tube

Donald B. Fisher, Yujia Wu1 and Maurice S. B. Ku

Department of Botany, Washington State University, Pullman, Washington 99164-4238

Although the enucleate conducting cells of the phloem are incapable of protein synthesis, phloem exudates characteristically contain low concentrations of soluble proteins. The role of these proteins and their movement into and out of the sieve tubes poses important questions for phloem physiology and for cell-to-cell protein movement via plasmodesmata. The occurrence of protein turnover in sieve tubes was investigated by [35S]methionine labeling and by the use of aphid stylets to sample the sieve tube contents at three points along a source-to-sink pathway (flag leaf to grains) in wheat plants (Triticum aestivum L.). Protein concentration and composition were similar at all sampling sites. The kinetics of 35S-labeling of protein suggested a basically source-to-sink pattern of movement for many proteins. However, an appreciable amount of protein synthesis and, presumably, removal also occurred along the path. This movement appeared to be protein specific and not based on passive molecular sieving. The results have important implications for the transport capacities of plasmodesmata between sieve tubes and companion cells. The observations considerably expand the possible basis for ongoing sieve tube-companion cell interactions and, perhaps, interaction between sources and sinks.

1 Permanent address: Shaanxi Forestry Institute of Science, Yangling, Shaanxi, People's Republic of China.




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