photosynthetic and nonphotosynthetic pigments of two rose cultivars under different light intensities

biosynthesis of plant pigments is affected by environmental factors especially light intensity. an expriment was conducted to evaluate the effect of different light intensities on photosynthetic and non-photosynthetic pigments of two rose cultivars including ‘red one’ and ‘gulmira’ under greenhouse conditions. in this experiment, the effects of different light intensities including 240, 520 and 640 mol/m2/s and control with 1200 mol/m2/s (without application of plastic nets) on the rose cultivars was evaluated under greenhouse conditions. plastic nets were used to obtain different levels of light intensities. the results showed that photosynthetic pigments, chlorophyll and carotenoids, significantly increased in the light intensity of 240 mol/m2/s vs. control. in this light intensity, antocyanin content was significantly reduced. reducing light intensity to 240 mol/m2/s could result in higher chlorophyll as well as carotenoid content without significant changes in flavonoids. increasing anthocyanin content with increasing light intensity to 1200 mol/m2/s could be a defense mechanism in plants against toxic levels of light intensities.