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Article
New Phenolic Plant Growth-regulating Compounds
IT has been reported that 2,6-dichlorophenol and the corresponding dibromo- and diiodo- compounds show appreciable activity in promoting cell elongation when examined in the pea segment and pea curvature tests...
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Article
Estimation of Kinetin by a Colorimetric Method
ALTHOUGH extinction coefficient data are available for 6-furfuryl-amino purine (kinetin)1 it is not always possible to use these in its estimation. During investigations of the metabolism of kinetin in plant tiss...
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Article
Halogen Derivatives of 4-Hydroxybenzoic Acid as Root Growth Stimulants and the Importance of Light in this Response
THE discovery by one of us1 of the selective herbicidal activity of 3,5-diiodo-4-hydroxybenzonitrile (ioxynil) and its dibromo- analogue (bromoxynil) has led here to a number of other developments. Thus the high ...
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Article
The isolation and properties of a fungicidal compound present in seedlings of Vicia faba
The isolation of a fungicidal compound in 0.001% yield from healthy broad bean seedlings by extraction with benzene is described. After column chromatography, purification was achieved by low temperature recry...
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Chapter and Conference Paper
Studies with Plant Growth Inhibitors
In this paper I propose to deal with three aspects of our research at Wye all of which, in their different ways, are concerned with plant growth inhibition.
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Article
Fungitoxicity
Chemistry of Fungicidal Action
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Article
Plant Hormones
Plant Hormone Research in India.
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Article
The root cap and control of root elongation in Zea mays L. seedlings exposed to white light
Light-induced inhibition of the elongation of primary roots of Zea mays seedlings is dependent upon the perception of light by the root cap. Separate exposure of detached root caps and roots from which root caps ...
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Article
Control of Zea root elongation by light and the action of 3,5-diiodo-4-hydroxybenzoic acid
THE inhibitory effect of white light on the elongation of the primary roots of wheat and rice seedlings has been reported1–4. It would seem that light affects the ability of the cells to increase in length and al...
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Article
Abscisic acid levels in relation to drought tolerance in varieties of Zea mays L.
THE level of growth inhibitor in plants increases when they are subjected to water stress and the major constituent of this inhibitor is abscisic acid (ABA)1–3. By its effect in closing stomata, ABA can control t...
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Article
Ethylene production by cress roots and excised cress root segments and its inhibition by 3,5-diiodo-4-hydroxybenzoic acid
3,5-Diiodo-4-hydroxybenzoic acid (DIHB) has been shown to exert an inhibitory effect on the formation of ethylene by the roots of intact cress Lepidium sativum seedlings in light, and by excised cress root segmen...
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Article
Abscisic acid and the response of the roots of Zea mays L. seedlings to gravity
Exogeneous application of abscisic acid (ABA) to intact roots of LG 11 maize seedlings inhibits root elongation and induces bending of the root in response to gravity in darkness, even though the roots of thes...
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Article
Promotion of cress root elongation in white light by 3,5-diiodo-4-hydroxybenzoic acid
The effect of low concentrations of 3,5-diiodo-4-hydroxybenzoic acid (DIHB) in promoting the elongation of light-exposed cress (Lepidium sativum L.) roots has been further examined. Aeration of the DIHB solution ...
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Article
The role of the root cap in the response of the primary roots of Zea mays L. seedlings to white light and to gravity
Investigations into the relationship between the light-induced inhibition of root elongation and the response of Zea mays primary roots to gravity have revealed a close similarity between growth-inhibiting factor...
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Article
Control of rust diseases by diterpenes from Nicotiana glutinosa
AN epimeric mixture of the diterpenes sclareol and 13-epi-sclareol (sclareol) (Fig. 1) has been shown to constitute 10%; of the surface exudate on leaves of Nicotiana glutinosa1. Investigations into its effect on...
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Article
The effects of 3,5-diiodo-4-hydroxybenzoic acid on the oxidation of IAA and auxin-induced ethylene production by cress root segments
In previous research here, 3,5-diiodo-4-hydroxybenzoic acid (DIHB) was shown to promote the elongation of roots of cress (Lepidium sativum) seedlings growing in light, and to inhibit the auxin-induced production ...
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Article
The effect of certain phenolic acids on the growth and ethylene production of cress seedling roots
Previous studies showed that 3,5-diiodo-4-hydroxybenzoic acid (DIHB) promotes the root growth of cress seedlings (Lepidium sativum) in the light and also inhibits the production of ethylene by this tissue. Studie...
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Article
Chemical treatment of soil alleviates effects of soil compaction on pea seedling growth
HIGH mechanical resistance of soils, related to naturally occurring hard pans, or to compaction by machinery and untimely cultivation1–3, often reduces crop yields through poor development of root systems1,4–6. I...
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Chapter and Conference Paper
Root Growth Inhibitors
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 agri...
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Chapter
Potential for Regulation of Plant Growth and Development
A plant, unlike an animal, has to grow and survive and yet remain in the same place throughout its life. Furthermore, it is exposed to attack by pests and diseases, competition from weeds, and may be subjected...
