Flowering response of Eremurus to post-harvest temperatures.
Kamenetsky, R.; Rabinowitch, E.;
Scientia Horticulturae Year: 1999 Vol: 79 Issue: 1/2 Pages: 75-86 Ref: 12 ref.
1999
บทคัดย่อ
The influence of postharvest temperature on the flowering response of the ornamental geophyte Eremurus was studied. The plants (Shelford hybrids) were harvested at 4 different stages of development and were separated into 3 groups. The first group was immediately exposed to 2 deg C, the second group to 20 deg C followed by 2 deg C, and the third group to 20 deg C followed by 32 deg C and subsequently 2 deg C. Scanning electron microscopy (SEM) was used for concurrent morphological analysis of floral development. Exposing plants to 2 deg C in the initial stage of floral development caused plant destruction and death, while the same temperature at the stage of full differentiation produced normal flowering. Temperatures of 20 deg C and especially 32 deg C significantly improved flowering of the plants harvested in the early stages of florogenesis, whereas the same treatment applied to the plants harvested at the end of flower differentiation did not affect the flowering process. A developmental di
sorder termed 'interrupted floral development' (IFD), was observed only in the plants harvested when the racemes were fully differentiated. This was probably caused by the very high air and soil temperatures that prevail in Israel during the summer. The extent of floral differentiation has a determining role in subsequent scape elongation and flowering.