Abstract:
:Lemna paucicostata Hegelm. 6746 possesses specific systems for uptake of choline and ethanolamine. Each is distinct from the six other systems for uptake of organic compounds so far identified in this plant. Both systems show biphasic kinetics, so that uptake by them can be described as the composite result of two Michaelis-Menten processes. Inhibitor studies are reported which indicate the very strict structural specificity of each system. The kinetic constants of choline uptake are such that, at an external concentration of 0.65 micromolar, the total requirement of the plant for this compound would be met, 41% via the high affinity system and 59% via the lower. At an external concentration of 2.4 micromolar ethanolamine, an amount of this compound sufficient to form the total choline of the plant would be supplied, 59% via the high affinity system and 41% via the lower. These, and other observations, strongly support the physiological importance of these systems under natural conditions.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Datko AH,Mudd SHdoi
10.1104/pp.81.1.285subject
Has Abstractpub_date
1986-05-01 00:00:00pages
285-8issue
1eissn
0032-0889issn
1532-2548journal_volume
81pub_type
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