T. H. Attridge

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Hypocotyl growth in Cucumis sativus L. cv Ridge Greenline is inhibited by increasing blue light (B) fluence rate in a near log linear fashion once a low fluence threshold is exceeded. Deviation from log linearity at the highest fluence rate used here is due to light perceived by the cotyledons and this effect is assigned to phytochrome. This response can be(More)
An interaction is demonstrated between the effects of phytochrome and cryptochrome (the specific blue-light photoreceptor) in the inhibition of hypocotyl elongation of light-grown cucumber (Cucumis sativus L.) cv. Ridge Greenline seedlings. At certain fluence rates of blue light the total inhibition response is greater than the sum of the separate responses(More)
The effects of supplementary ultraviolet-A (UV-A) and ultraviolet-B+A (UV-B+A) in the natural environment on the growth and morphology of various ecotypes of Arabidopsis thaliana were investigated. The ecotypes investigated were Columbia (Col-4), Landsberg erecta (Ler-0), Cvi-0, Wassilewskija, Enkheim-D, Aa-0 and Di-1. The mutant hy-4 was also used. Results(More)
Polychromatic ultraviolet (UV) action spectra for various growth responses of the dicotyledon Bellis perennis L. (daisy) and the grass Cynosurus cristatus L. (crested dog's-tail) have been measured. The plants were grown in the natural environment and ambient daylight was supplemented with five different UV irradiances centred at eight different wavelengths(More)
Some responses of various meadow species to enhanced UV-radiation of the natural daylight spectrum are described together with the experimental protocol employed. Growth responses to supplementary UV-B+A are mostly inhibitory when compared to the ambient daylight treatment for Bellis perennis, Cardamine pratensis, Cynosurus critatus and Ranunculus ficaria.(More)
1. There is an increase in the extractable acitivity of phenylalanine ammonia-lyase following excision of hypocotyl segments of dark-grown gherkin seedlings This increase is prevented by the reaction product, cinnamin acid. 2. Density-labelling experiments show that cinnamic acid affects the rate of enzyme synthesis. By contrast the regulation of(More)