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Plants respond to their environment.
Member rating: No Rating | Words: | Submitted: Mon Mar 22 2004
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PLANTS RESPOND TO THEIR ENVIRONMENT Key Points * Light is vital for photosynthesis, but is also necessary to direct plant growth and development. * Light acts as a signal to initiate and regulate photomorphogenesis, which are the light mediated changes in plant growth and development. * The developmental changes characteristic of photomorphogenesis shown by the shorter, greener seedlings are induced by light. Typically, plants are responsive to wavelengths of light in the red and far-red regions of the spectrum through the action of several different photosensory systems. * The photoreceptors for red and far-red wavelengths are know as phytochromes. Plants use phytochrome to detect and respond to red and far-red wavelengths. * Phytochromes are proteins with a light absorbing pigment attached, called chromophores. * The phytochrome is synthesized in the Pr form. Upon binding the chromophore, it becomes sensitive to light. If it absorbs red light it will change conformation to the biologically active Pfr...
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