TRANSLOCATION IN MACROCYSTIS. III. COMPOSITION OF SIEVE TUBE EXUDATE AND IDENTIFICATION OF THE MAJOR C14-LABELED PRODUCTS1 |
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Authors: | Bruce C. Parker |
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Abstract: | The major C14-labeled substance in sieve tube exudate of M. pyrifera is D-mannitol, comprising 3.6% (w/v). No sugars are detectable. Certain amino acids also possess some CWabeling and occur in significantly high concentrations in exudate. The exudate contains negligible ether-soluble lipid, but has a large amount of protein and a high concentration of K+. Neither protein nor lipid become labeled significantly in sieve tubes during short-term translocation experiments with C14. In general the chemical composition of the assimilate stream is comparable to that of vascular plants and does not, consequently, necessitate a different mechanism for translocation. |
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