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Chapter and Conference Paper
Plant Cell Responses and the Role of Growth Substances
It is commonplace that there is a bewildering variety of effects of applied plant growth regulators on plant tissues, and there is a mass of observational and descriptive data on plant cell responses, but very...
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Chapter and Conference Paper
The Nomenclature of Abscisic Acid and its Metabolites
At the 1967 meeting of this Society in Ottawa, those involded with the characterisation of abscisic acid (ABA) agreed on its new name [1, 2]. Since then it has become evident that abscisic acid is the only act...
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Article
Determination in plant cells
The possibility that some of the variation in callus cultures involves epigenetic changes is examined in cultures established from the hypoootyls and roots ofEuphorbia heterophylla. It is shown that the responses...
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Article
14C-sucrose uptake by internode tissue
The transport and accumulation of 14C activity in decapitated, non-growing internodes of Phaseolus vulgaris L following application of 14C-sucrose or 14CO2 is stimulated by application of auxins, cytokinins and g...
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Article
The effect of penicillin on the levels of endogenous gibberellins and cytokinins in mungbean (Vigna radiata L.) seedlings
The levels of gibberellin and cytokinin like substances are increased in mungbean (Vigna radiata L. Wilczek) seedlings by penicillin treatment. The possible role of penicillin in regulating the hormone levels in ...
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Article
Cytokinin biosynthesis in crown-gall tissue ofVinca rosea
When care was taken to minimise the effects of phosphatase activity during extraction ofVinca rosea crown-gall tumour tissue, a large proportion of extractable cytolinin activity was present in the nucleotide fra...
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Article
Non-uniform distribution and seasonal variation of endogenous indol-3yl-acetic acid in the cambial region of Pinus contorta Dougl.
Endogenous, free indol-3yl-acetic acid (IAA) levels were measured in the main stem in the 10-year-old cambial zone, in the adjoining differentiating xylem, and in the adjoining mature xylem of 15–20-year-old Pinu...
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Article
Cytokinin metabolism in Phaseolus vulgaris L.
The major cytokinins in stems of decapitated, disbudded bean plants have been identified by enzymic degradation, Sephadex LH20 and reversed phase high performance liquid chromatography, and by combined gas chr...
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Article
A tracheid-differentiation factor from pine needles
Exogenous indol-3yl-acetic acid (IAA), alone and together with several cytokinins, was ineffective in promoting the complete differentiation into tracheids of cambial derivatives of Pinus contorta Dougl.; IAA alo...
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Article
Dihydroconiferyl alcohol — A cell division factor from Acer species
A compound that stimulated growth of soybean callus was isolated from spring sap of sycamore (Acer pseudoplatanus L.). Insufficient compound was isolated to permit it to be characterised. A compound with identica...
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Chapter and Conference Paper
The Hormonal Control of Tuberisation in Potato
Just as the photoperiodic control of flowering appears to involve a flowering stimulus produced in the leaves under inductive conditions, so there is analogous evidence for the existence of a tuber-inducing st...
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Article
The biosynthesis of cytokinins in crown-gall tissue of Vinca rosea
The crown-gall tissue of Vinca rosea converts labelled adenine into cytokinins. The principal initial products appear to be ribosylzeatin phosphates; zeatin and ribosylzeatin are also produced in appreciable quan...
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Chapter
Growth Regulators and Assimilate Partition
As has already been pointed out (Wareing, see Chapter 8), crop yield depends not only upon the total dry matter production (biomass) by the crop, but also upon the proportion of the total dry matter which cons...
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Chapter
Temperature Responses and Yield in Temperate Crops
Assuming that mineral nutrients and water supply are not limiting, crop yield depends upon: (1) the photosynthetic rate, (2) the amount of solar radiation intercepted and utilized in photosynthesis over the gr...
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Chapter and Conference Paper
Cytokinin Relations in the Whole Plant
Cytokinin levels in Xanthium strumarium decline rapidly throughout the plant after only one short-day cycle. This effect appears to be due to reduced cytokinin production by the roots, in response to a signal pro...
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Article
Cytokinins of sycamore spring sap
The cytokinins present in the spring sap of Acer pseudoplatanus L. were investigated. Ribosyl-trans-zeatin, trans-zeatin and dihydrozeatin were isolated and identified by combined gas chromatography-mass spectrom...
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Chapter
The Plant Life-cycle and the Environment
In this book the relations between structure and function have been considered at various levels of organisation, starting at the molecular level and proceeding to organelles such as chloroplasts, and later to...
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Article
Cytokinins in Populus x robusta Schneid: A complex in leaves
At least seven cytokinins have been detected in mature leaves of Populus x robusta Schneid after chromatography on Sephadex LH-20. Two of these have similar elution volumes to zeatin and zeatin riboside. A third ...
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Article
Cytokinins in Populus x robusta (schneid): Light effects on endogenous levels
Cytokinin levels in both attached and detached mature leaves of poplar (Populus x robusta) increase transiently after short periods of exposure to red light. The degree and rapidity of response seems dependent on...
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Article
Effects of abscisic acid on the levels of endogenous gibberellin-like substances in Solanum andigena
Treatment of young, fully expanded leaves of Solanum andigena with synthetic abscisic acid resulted in marked increases in gibberellin-like substances. Abscisic acid treatment caused increases in the gibberellin ...
