Untersuchungen zum Entwicklungsrhythmus und zur Kultursteuerung belaubt überwinternder Stauden am Beispiel von Aster alpinus 'Happy End'
Abstract (Summary)A study was made on the development rhythm of perennials on Aster alpinus 'Happy End' from the beginning of propagation until flowering, to give recommondation for cultivation as a flowering potplant. Approximately three years of examinations with different propagated plants were carried out. Plants from generative and vegetative propagation (cuttings, in vitro) were used. The course of vegetative and generative development was examined especially taking into account the dormant stages and the differentation of flowering plants. The change of the vegetative to the generative meristem was recorded by the transplantation of shoots to the invitro-culture and by histological examinations. The flower initiation took place during the juvenile development phase and before the beginning of endodormancy. The earliest flower differentation was observed at the end of September. The endodormancy started in the middle of october and lasted until mid to late December. Only afterwards was a further development of the inflorescence possible. In the second part the influence of exogen application with the cytokinin 6-Benzylaminopurin (BAP) and the influence of chilling at the vegetative and generative development were examined. In addition the plants were sprayed with BAP-solutions with different concentrations during the juvenile phase of about 6 weeks. The influence of chilling was measured under outdoor conditions and with temporary artificial chilling. All temperatures under 2 øC and the length of time they were chilled, were recorded. Afterwards the plants were maintained in the greenhouse until flowering. The application of BAP with concentrations of 20 and 25 mg/l caused significantly longer vegetative shoots. The influence of the cytokinin treatment on the number of elongated inflorescences was non-significant in contrast. The rate of progress to generative development improved with increased chilling time. The vernalisation response is not obligatory. Both factors (cytokinin application and chilling) together have a synergistic effect on the number of elongated inflorescences.
Document Full Text
Source Type:Master's Thesis
Keywords:Asteraceae WL 9927 Cytokinin Development Chilling
Date of Publication:06/07/2000