We investigated the induction of β-glucuronidase (GUS) activity in transgenic Nicotiana plumbaginifolia harboring palg2b promoter-uidA chimeric gene after light irradiation. GUS activity was increased distinctly in leaves of transgenic plants by white light irradiation and was slightly increased in transgenic green calli by blue light irradiation. The present results indicate that the g2b promoter might be useful to control the expression of a foreign gene in transgenic plants.