【摘要】 植物主要光受体光敏色素调节植物的多种光调控,使其作出最适宜的光生长,如:光形态建成.光敏色素接受光信号的生物功能基于其红光吸收型(Pr)和具有生理活性的远红光吸收型(Pfr)之间的光可逆式光转化.依据光生物学的标准该转化过程与光合作用相比是一个低能光反应过程,而且其间产生的中间过渡态和光敏色素的亚库可能反过来影响光转化的过程而最终表现出生理功能.在此,主要综述了近年来运用时间分辨动力学特别是差分荧光和光化学,研究光敏色素及其中间过度态光生物物理和光生物化学特性的若干进展,讨论了光信号转导的原初光反应的机理.更多还原

【Abstract】 Phytochromes mediate a great variety of photoregulated reactions in plants, thus determining the strategy of their optimum light development, e.g. photomorphorgenesis. Its photoreception biofunction is based on the photoreversible phototransformation of the initial redlight (R) absorbing form (Pr) into a physiologically active farredlight (FR) absorbing form (Pfr). In contrast to photosynthesis, this photoprocess is recognized as an lowenergy photoreaction based on photobiological criteria. Meanwhile, the producing intermediates and phytochrome subpopulations may affect the phototransformation process in turn and thus eventually exert physiological function during plant development. The primary photoreaction of signal transduction are discussed by reviewing some of recent progress in the photobiophysical and photobiochemical studies on phytochromes and the corresponding intermediates with the use of the timeresolved kinetic approaches, especially the comparative fluorescence and photochemical studies更多还原