R. L. Wain
1977
Citations
0
Influential Citations
14
Citations
Journal
Journal name not available for this finding
Abstract
Our interest in this subject arose from the discovery (43) of the selective herbicides, 3,5-diiodo-4-hydroxybenzonitrile (ioxynil) and the dibromo derivative (bromoxynil), both of which are widely used in agriculture. This discovery stimulated research on their mode of action and metabolism, and investigations on chemical structure in relation to herbicidal activity were also initiated (14, 15, 42, 44, 58). One of the compounds examined in this work was 3,5-diiodo-4-hydroxybenzoic acid (DIHB). In translocation experiments the roots of cress seedlings exposed to light in culture solution containing 10-5 M DIHB were found to grow to about three times the length of control roots and were the same length as untreated roots grown in darkness (46). Thus the wellknown inhibitory effect of light on root growth (5, 19, 20, 29, 41) could, in the case of cress roots, be removed by DIHB treatment. This growth-promoting effect of DIHB in the light was shown to arise by promotion of cell elongation and not by stimulating cell division (45).