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MOVEMENT OF GROWTH REGULATORS IN PLANTS
Author(s) -
McCREADY C. C.,
JACOBS W. P.
Publication year - 1963
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1963.tb06308.x
Subject(s) - phaseolus , acetic acid , polar , botany , chemistry , horticulture , auxin , biology , biochemistry , physics , astronomy , gene
S ummary The movement of radioactivity added in the form of indoleacetic acid (as the natural hormone) or as 2,4‐dichlorophenoxyacetic acid (as a synthetic growth regulator) was followed in segments cut from petioles of Phaseolus vulgaris . The movement of 14 C added as IAA was strongly basipetally polar, although significant amounts moved acropetally during 24 hours. The velocity of basipetal movement was 6 mm/hour for IAA‐[ 14 C], and was the same for donor concentrations of 5 or 50 μM. The flux increased with increasing concentration in the donor blocks, but a progressively smaller percentage of the applied radioactivity was transported. 2,4‐D‐[ 14 C] was found to have very similar transport properties to those of IAA‐[ 14 C], except that its velocity of basipetal movement was much less, namely 1 mm/hour. After correction had been made for the much slower net loss of 2,4‐D from its donor blocks, the acropetal movement of the 14 C from the two substances was essentially the same.