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TRANSLOCATION IN MACROCYSTIS . III. COMPOSITION OF SIEVE TUBE EXUDATE AND IDENTIFICATION OF THE MAJOR C 14 ‐LABELED PRODUCTS 1
Author(s) -
Parker Bruce C.
Publication year - 1966
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1966.tb04590.x
Subject(s) - exudate , sieve tube element , biology , sieve (category theory) , chromosomal translocation , identification (biology) , molecular sieve , botany , composition (language) , biochemistry , phloem , gene , linguistics , philosophy , catalysis , mathematics , combinatorics
SUMMARY The major C 14 ‐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 C 14 ‐labeling 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 C 14 . 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.