Primary Studies On Forcing Culture Of Herbaceous Peonies

The forcing culture of herbaceous peonies was studied in this paper. The contents include three parts: forcing culture technology; the physiological and biochemical changes during cold storage; the growth condition after cold storage and the characteristics of photosynthesis. The results can be summarized as follows:1. The substrate has dramastic influence on the growth of herbaceous peonies. The mixture of perlite and vermiculite(V:V=1:1) is the optimal for the growth. The those planted in soil were not grown well due to continual and heavy rain and bad drainage. While the potted plants grew well. The dramastic and rapid decline of temperature and heavy rain and poor light caused serious flower bud abortion during the culture.2. The research of water, soluble protein, soluble suger, starch in the roots during the cold storage revealed that the nutrition was partly consumed and the roots remain high activity.SOD shown relative placidity and high activity during storage. CAT and POD might play important roles of eliminating active oxygen atoms.3. The plants grown in greenhouse were obviously higher than those gorwn in open field. However, the flowering rate of the latter was greatly better than the former. After long time storage in refrigeratory.The plants still grew well in open field. The net photosynthetic (Pn) rate and transpiration rate of the plants grown in greenhouse had one peak while those grown in open field had two peaks. The Gs are closely related to temperature and light intensity. Temperature and light intensity are the most important factors in the culture. The optimal light intensity was respectively 600-800μmol m^-2s^-1 to the greenhouse culture and 800-1000μmol m^-2s^-1 to the open field culture.