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Farewell to the Internal Clock - A contribution in the field of chronobiology (Hardcover, 2007 ed.)
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Discovery Miles 15 390
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Farewell to the Internal Clock - A contribution in the field of chronobiology (Hardcover, 2007 ed.)
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Nearly everything making up what we call the "environment" of a
plant has an infuence on the way it grows. Sunlight, te- perature,
moisture contents of soil and atmosphere and vib- tions are all
obvious examples of environmental components, and transient
variations in their amount or intensity lead the plant to manifest
more or less immediate responses. Small changes in carbon dioxide
level in the atmosphere can even have effects, but these take a
longer time to be registered - at least those that are visible,
albeit at the microscopic level. Plants meet the challenges of the
environment by means of acclimation. In this respect, plants are
notable for the pl- ticity of their development. However, where
morphological or physiological plasticity is no longer an option,
the responses would be by means of adaptations as a result of
genetic - lection or genetic "assimilation" (Waddington 1957).
Thus, a feature that was once a facultative transient response to
an environmental perturbation becomes a constitutive charac- ristic
of plant structure or function. It is in this way that the
environment continually molds the way in which plants de- lop, and
also defnes the areas upon planet Earth where they will thrive.
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