Abstract:
:2,4-Dichlorophenoxyacetic acid had a multiple effect on the development of indoleacetic acid oxidase isoenzymes in tobacco callus tissues (Nicotiana tabacum, cv. White Gold) cultured in vitro, and the development of these isoenzymes was differentially associated with growth promotion or inhibition depending on the concentration of 2,4-dichlorophenoxyacetic acid. At low concentrations (0.1 to 1 mum) it promoted the development of a fast migrating isoenzyme A(5) accompanied by stimulation of a tumor-type growth. At high concentrations (10 to 100 mum), it inhibited the development of the fast migrating isoenzymes but promoted a sharp rise in others with slower electrophoretic mobilities, which was accompanied by growth inhibition. The implications are that 2,4-dichlorophenoxyacetic acid might alter the level of endogenous auxins through its dual effects on the oxidase isoenzyme system.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Lee TTdoi
10.1104/pp.49.6.957subject
Has Abstractpub_date
1972-06-01 00:00:00pages
957-60issue
6eissn
0032-0889issn
1532-2548journal_volume
49pub_type
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