THE NATURE OF THE BLUE LIGHT PHOTORECEPTOR IN HIGHER PLANTS AND FUNGI
1976; Elsevier BV; Linguagem: Inglês
10.1016/b978-0-408-70719-0.50007-3
Autores Tópico(s)Algal biology and biofuel production
ResumoThere is a photoreceptor system both in higher and lower plants and in fungi. This pigment system absorbs light in the long-wavelength ultraviolet and blue regions of the spectrum and fails to show the sort of photoreversibility that is characteristic of so many phytochrome responses. This photoreceptor is termed blue light photoreceptor. This chapter provides an overview of the nature of the blue light photoreceptor in higher plants and fungi. The blue light photoreceptor itself is probably a flavoprotein that becomes photoreduced by light and, therefore, reduces a b-type cytochrome. The system becomes reoxidized in following darkness. The chapter presents a list of photoresponses. There are two known photoresponses in fungi that do not show the characteristic blue-ultraviolet sensitivity. The first of these responses is the phototropic response of conidiophores of the fungus Entomophthora coronata (Conidiobolus villosus). This response shows maximum sensitivity in the blue and red regions of the spectrum. The second response is the phototactic migration of pseudoplasmodia of the cellular slime mould Dictyostelium discoideum with clear action maxima near 430 and 560 nm. The chapter presents some data and experimental studies regarding blue light photoreceptor. Substantial progress has been made during the past three years in identifying the blue light photoreceptor.
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