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Plant Responses to Near-Ultraviolet Light


Although man has effectively accelerated genetic alteration among crop plants in the direction of greater suitability for intensive culture, this has been a comparatively recent and minor genotypic rearrangement as compared to the accumulated contribution of millions of years of prior evolutionary selection. Man's concern with plants has from the beginning been based on their unique photosynthetic capability through which light energy, the ultimate source of life-sustaining free energy, is converted to biologically available chemical energy. In addition, light has been a primary environmental factor within the total regime of selection pressures which have shaped the morphogenic character of plants. It is permissable to anticipate terrestrial plants as responsive in a variety of ways (many yet undescribed) to all wavelength regions of the earth-impinging solar irradiance spectrum. This could be especially true within the shorter wavelength regions (ultraviolet) due to greater photon energies enabling greater possible photochemical and thus greater photobiological activity (39). With the foregoing in mind, how do common light sources vary and is this of any consequence?