WAVELENGTH DEPENDENCE OF ULTRAVIOLET RADIATION‐INDUCED MORTALITY AND K+ EFFLUX IN CULTURED CELLS OF Rosa damascena

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Abstract
Abstract— The sensitivity of the colony‐forming ability of rose‐cell cultures (Rosa damascena L. cv Gloire de Guilan) to ultraviolet radiation has been measured for wavelengths from 240‐334 nm. These cultures are much less sensitive than bacteria and animal cells in the region from 240‐310 nm, an observation attributed to the presence in rose cells of ultraviolet‐radiation‐absorbing compounds. The effect of the same wavelengths on K+ efflux was also measured and compared to the spectrum for lethality. K+ efflux or damage leading to K+ efflux might contribute to lethality at wavelengths longer than 290 nm but not at shorter wavelengths.