Results 291 to 300 of about 58,693 (334)
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Science, 1960
Flowering of plants depends upon the length of the night. This control of flowering is one of the methods of adaptation of species by which an unfavorable season is anticipated.
H. A. Borthwick, S. Hendricks
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Flowering of plants depends upon the length of the night. This control of flowering is one of the methods of adaptation of species by which an unfavorable season is anticipated.
H. A. Borthwick, S. Hendricks
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Photomorphogenesis and Photoperiodism in Plants
2007Plants depend on light as their main source of energy. However, light is also an important source of information for plants, and changes in the nature of the light reaching a plant can signal seasonal change, potential and actual competition by shading, proximity to the soil surface of roots and seeds, and potential photodamage.
Weller, James L., Kendrick, Richard E.
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Genetic variation in photoperiodism among naturally photoperiodic rat strains
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 2001Rattus norvegicus has been considered nonphotoperiodic, but Fischer 344 (F344) rats are inhibited in growth and reproductive development by short photoperiod (SD). We tested photoresponsiveness of the genetically divergent Brown Norway (BN) strain of rats.
M. Benjamin Shoemaker +2 more
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Photoperiodism in quail: testicular growth and maintenance under skeleton photoperiods
Journal of Endocrinology, 1982Testicular growth was induced in quail which were exposed to a skeleton photoperiod that included a pulse of light given during the dark period (night-interruption). The minimum duration of the pulse inducing testicular growth was 3·75 min per day. Longer pulses induced greater rates of growth, and of LH and FSH secretion; maximum rates occurred with a
B. K. Follett, J. J. Milette
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Archiv für Meteorologie, Geophysik und Bioklimatologie Serie B, 1970
Many annual biological cycles are thought to be synchronized by seasonal patterns of day length. But day length, or day length changes,per se, do not explain the latitudinal variations of observed cycles in a consistent manner. A standardization of day length with latitude, based on the extreme photoperiods at each latitude, yields a “relative day ...
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Many annual biological cycles are thought to be synchronized by seasonal patterns of day length. But day length, or day length changes,per se, do not explain the latitudinal variations of observed cycles in a consistent manner. A standardization of day length with latitude, based on the extreme photoperiods at each latitude, yields a “relative day ...
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1981
Photoperiodism appears via one manifestation or another in many if not most eukaryotic organisms, including plants and animals. In plants, reproduction is often controlled or influenced by response to relative lengths of day and night, and form of a plant (e.g., internode lengths, stem heights, leaf shapes) is virtually always influenced by photoperiod.
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Photoperiodism appears via one manifestation or another in many if not most eukaryotic organisms, including plants and animals. In plants, reproduction is often controlled or influenced by response to relative lengths of day and night, and form of a plant (e.g., internode lengths, stem heights, leaf shapes) is virtually always influenced by photoperiod.
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Photoperiodicity in the Female Ferret
Journal of Experimental Biology, 1951ABSTRACT Evidence accumulated during two years’ work and experience in photoperiodicity in ferrets suggests the following conclusions: Oestrus or anoestrus may be induced by influencing the activity of the pituitary gland; this is effected through a contrast-sensitive mechanism which is stimulated by light:dark sequences ...
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1997
Publisher Summary This chapter discusses photoperiodic photoreceptors in plants. The detection of light for photoperiodic responses in angiosperms is primarily accomplished by members of the phytochrome family of photoreceptors, with the exception of members of the Cruciferae where a blue-light photoreceptor also plays a photoperiodic role.
Brian Thomas, Daphne Vince-Prue
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Publisher Summary This chapter discusses photoperiodic photoreceptors in plants. The detection of light for photoperiodic responses in angiosperms is primarily accomplished by members of the phytochrome family of photoreceptors, with the exception of members of the Cruciferae where a blue-light photoreceptor also plays a photoperiodic role.
Brian Thomas, Daphne Vince-Prue
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1997
Publisher Summary This chapter focuses on the photoperiodic timekeeping in plants. In order to locate the time of year accurately, the timekeeping mechanism in photo-periodism must operate with a considerable degree of precision. It must also be relatively insensitive to random variations in the environment.
Brian Thomas, Daphne Vince-Prue
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Publisher Summary This chapter focuses on the photoperiodic timekeeping in plants. In order to locate the time of year accurately, the timekeeping mechanism in photo-periodism must operate with a considerable degree of precision. It must also be relatively insensitive to random variations in the environment.
Brian Thomas, Daphne Vince-Prue
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1981
Annual cycles in many functions have been demonstrated in practically all groups of vertebrates. Starting with the work of Rowan (1925) in birds and of Baker and Ranson (1932) and of Bissonette (1932) in mammals, it has been shown that the photoperiod (i.e., the light fraction of the 24-hr day and its seasonal changes) influences the annual cycle ...
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Annual cycles in many functions have been demonstrated in practically all groups of vertebrates. Starting with the work of Rowan (1925) in birds and of Baker and Ranson (1932) and of Bissonette (1932) in mammals, it has been shown that the photoperiod (i.e., the light fraction of the 24-hr day and its seasonal changes) influences the annual cycle ...
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