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Cytokinin Function: Increase in [Methyl −14 C] Metabolism to Phosphatidylcholine and a Decrease in Oxidation to Carbon Dioxide −14 C
Author(s) -
SCHAEFFER G. W.,
SHARPE F. T.
Publication year - 1971
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1971.tb01473.x
Subject(s) - cytokinin , dormancy , methionine , metabolism , axillary bud , methylation , biology , phosphatidylcholine , apical dominance , botany , carbon dioxide , shoot , chemistry , biochemistry , membrane , germination , auxin , phospholipid , tissue culture , in vitro , ecology , amino acid , gene
Axillary buds of Nicotiana tabacum L. cv. Maryland Catterton normally suppressed by apical dominance are released from dormancy with 6‐benzylaminopurine. This work was done to determine the change in the [methyl −14 C] metabolism from methionine during bud stimulation with cytokinin. Dormant buds metabolize [methyl −14 C] ‐methionine to 14 CO 2 more effectively than buds released from dormancy. This oxidation of the methyl group is inhibited with benzylaminopurine. On the other hand, the methylation of polar membrane components, including phosphatidylcholine, is enhanced by the cytokinin during the period preceding the increase in bud weight. The interpretation is presented that the enhanced synthesis of membrane components, as well as the preservation of the methyl groups, are mechanisms for the cytokinin release of bud dormancy with 6‐benzylaminopurine.