The Initiation of an Endogenous Rhythm Affecting Flower Bud Formation in Pharbitis nil
- 1 September 1974
- journal article
- Published by Wiley in Physiologia Plantarum
- Vol. 32 (1) , 62-65
- https://doi.org/10.1111/j.1399-3054.1974.tb03727.x
Abstract
When seedlings of Pharbitis nil are presented with an inductive dark period at varying times, they show a circadian fluctuation in the number of flower buds initiated. This study determines if this fluctuation is due to the plant's perception, at the time of the inductive dark period, of either a rhythmic, external, environmental stimulus or of an endogenous rhythm.Using experimental designs in which the time of planting, the time of seedling emergence from the soil, and the time at which the presentation of an inductive dark period are varied, this fluctuation in flower bud formation is shown to be due to an endogenous rhythm initiated or synchronized by some event associated with the emergence of the seedlings from the soil. The results are inconsistent with the hypothesis that the plants are responding to rhythmic external stimuli.This publication has 3 references indexed in Scilit:
- Rhythmicity of Flowering in Pharbitis nilPhysiologia Plantarum, 1973
- Effect of Temperature and Preconditioning on Photoperiodic Response of Pharbitis nilPlant Physiology, 1964
- 51. Erwin Bünning: Die endonome Tagesrhythmik als Grundlage der photoperiodischen ReaktionBerichte Der Deutschen Botanischen Gesellschaft, 1936