Circadian Rhythmicity in Excised Samanea Pulvini: I. Sucrose-White Light Interactions 1

AUTOR(ES)

Simon, Esther

RESUMO

The rhythmic movement of excised Samanea saman pulvini incubated in H2O or 50 mm sucrose was monitored during extended periods of white light (cool white fluorescent, 2,000 ft-c), darkness, or alternating white light (16 hr) and darkness (8 hr). In continuous white light, the rhythm damps at an intermediate angle after only one cycle, whether pulvini are incubated in sucrose or H2O. The rhythm also damps after the first cycle when darkened pulvini are incubated in H2O, but it persists for several cycles if sucrose is available. Sucrose depresses the mesor (average angle) during extended dark periods in Samanea, as in Albizzia julibrissin, but it increases the mesor if supplied during white light-dark cycles. With the latter irradiation schedule, oscillations persist for several cycles whether pulvini are supplied with H2O or sucrose, but closure is incomplete when pulvini are incubated in sucrose.

Documentos Relacionados

• Circadian Rhythmicity in Excised Samanea Pulvini: II. Resetting the Clock by Phytochrome Conversion 1
• Water Relations in Pulvini from Samanea saman1: I. Intact Pulvini
• A Circadian Rhythm in Oxygen Uptake by Samanea Pulvini
• Light-stimulated inositolphospholipid turnover in Samanea saman leaf pulvini
• Light-Stimulated Inositol Phospholipid Turnover in Samanea saman Pulvini 1: Increased Levels of Diacylglycerol