title: Potassium Channels in Samanea saman Protoplasts Controlled by Phytochrome and the Biological Clock.
abstract: Leaflet movement in legumes depends on rhythmic, light-regulated ion fluxes in opposing regions of the leaf-moving organ. In flexor and extensor protoplasts from Samanea saman Merrill, opening and closing of K(+) channels were rhythmic in constant darkness. When channels were open in flexor protoplasts they were closed in extensor protoplasts, and vice versa. The rhythms were shifted by a delay in the onset of constant darkness, a response typical of endogenous circadian rhythms. During the light period, the channels in flexor protoplasts were sensitive to red light that was followed by premature darkness; phytochrome was implicated as the photoreceptor.
authors.forename: H Y
authors.initials: HY
authors.lastname: Kim
authors.forename: G G
authors.initials: GG
authors.lastname: Coté
authors.forename: R C
authors.initials: RC
authors.lastname: Crain