Journal ArticleDOI
RESPONSES OF LIGHT‐GROWN WILD‐TYPE and LONG‐HYPOCOTYL MUTANT CUCUMBER SEEDLINGS TO NATURAL and SIMULATED SHADE LIGHT*
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TLDR
The photomorphogenic control of hypocotyl extension growth was characterized in wild type (WT) and long hypocotyle (Ih) mutant seedlings of cucumber grown under natural radiation in outdoor and glasshouse experiments.Abstract:
The photomorphogenic control of hypocotyl extension growth was characterized in wild type (WT) and long hypocotyl (Ih) mutant seedlings of cucumber (Cucumis sativus L.) grown under natural radiation in outdoor and glasshouse experiments. Hypocotyl extension growth of WT plants was promoted by supplementing sunlight with far-red light during the photoperiod, by reducing the amount of blue light reaching either the whole shoot or the hypocotyl, and by reducing the amount of UV reaching the whole shoot.The Ih seedlings only responded to a reduction in UV-B levels. Both WT and Ih seedlings showed phototropic responses to the direction of blue light. Increasing degrees of vegetational shade promoted hypocotyl growth of WT plants. The Ih mutant showed no hypocotyl growth promotion by natural shade in glasshouse experiments (no UV-B, low water demand) and a reduced response (10-23% of the WT response, according to pretreatment conditions) in outdoor experiments (UV-B, high water demand).read more
Citations
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Journal ArticleDOI
The shade avoidance syndrome: multiple responses mediated by multiple phytochromes
Harry Smith,Garry C. Whitelam +1 more
TL;DR: The concept of the shade avoidance syndrome is reviewed, how the misconception arose is shown, and the plurality of perception and response that is crucial to successful competition for light is emphasized.
Journal ArticleDOI
Phytochromes and Shade-avoidance Responses in Plants
TL;DR: The regulation of shade-avoidance responses by endogenous and exogenous factors and current understanding of the molecular components involved in red to far-red ratio signal transduction are highlighted.
Journal ArticleDOI
Keeping up with the neighbours: phytochrome sensing and other signalling mechanisms
TL;DR: In this paper, a paradigm of sensory diversity and sophistication is revealed for understanding the functioning of plant populations and communities, which has important implications for understanding how plants forage for light in plant canopies using a variety of photosensory systems.
Journal ArticleDOI
Light spectral quality, phytochrome and plant competition.
Johanna Schmitt,Renata D. Wulff +1 more
TL;DR: In this paper, it was shown that plants can perceive the quality of light reflected from neighbors as an accurate predictor of future competition, and respond morphologically even before they are directly shaded.
Journal ArticleDOI
Phytochromes, cryptochromes, phototropin: photoreceptor interactions in plants.
TL;DR: Experiments under natural radiation are beginning to show that the interactions create a phototransduction network with emergent properties, which provides a more robust system for light perception in plants.
References
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Journal ArticleDOI
Light Quality, Photoperception, and Plant Strategy
TL;DR: The paper discusses the development of signal-tranSDUCing photography techniques in relation to plant strategy, and the importance of light quality and Shade in this strategy.
Journal ArticleDOI
Uv-b effects on terrestrial plants
Manfred Tevini,Alan H. Teramura +1 more
TL;DR: Weighting functions, based on action spectra for specific responses, have been developed to assess the biological effectiveness of the irradiation sources and of predicted ozone depletion.
Journal ArticleDOI
Early detection of neighbour plants by phytochrome perception of spectral changes in reflected sunlight
TL;DR: It is suggested that the change in the R: FR ratio within seedling canopies serves as an early warning signal of oncoming competition.
Journal ArticleDOI
The function of phytochrome in the natural environment—ii. the influence of vegetation canopies on the spectral energy distribution of natural daylight
M. G. Holmes,Harry Smith +1 more
TL;DR: The spectral energy distribution below the canopy was found to be partially dependent on solar elevation and sky condition; it was also dependent on the age, height, leaf area index and chlorophyll content of the crop.
Journal ArticleDOI
The function of phytochrome in the natural environment—iii. measurement and calculation of phytochrome photoequilibria
Harry Smth,M. G. Holmes +1 more
TL;DR: Phytochrome photoequilibria have been measured in dark‐grown Phaseolus uulgaris L. and Cucurbita pepo I. hypocotyl hooks which had been exposed to various natural and artificial radiation sources.