Studies On Physiological Mechanisms And Bulblet Development Of Lilium 'Oriental Hybrids' In The Mountainous Region

This dissertation was performed to investigate the bulblet development and its physiological mechanisms of Lilium 'Oriental Hybrids' (cv. 'Sorbonne' and 'Siberia') in the mountainous region (Da Yang, Jinyun county; Gao Ping, Shuichang county, Zhejiang Province) having an elevation of 800m in year 2003 and 2004. The morphological and physiological changes were entirely recorded in the growth process of bulblet development. By the analysis of the concentration changes of total sugar, starch, reducing sugar, sucrose in the scales, the accumulation and distribution of carbohydrates in bulblets were studied, combining with the 14C tracer technique and the electron microscopy. It made clear that the main principles and characteristics for the bulb development of Lily, and worth to theoretic and practical meaning in the progress of commercial bulb production taken in our country. The main results are summarized as below.1. It was found that the fresh weight and circumference increased dramatically in the harvested bulbs which grown in the mountainous region. The average fresh weight of the harvested bulbs was 45.2g which 1.5 times than that of bulblets. Their average circumference reached 15.5cm which 3.4 times than that of bulblets when harvested in October, 2003.2. There is an obvious relationship between the leaf number and the size, fresh weight and plant height in harvested bulbs of Lily. It was divided into four groups, leaves number including below 15,15 to 17,18 to 20, and above 20. Regarding the group of leaves number, we could estimate the status of subterraneous growth and the sizes of harvested bulb.3. The total soluble sugar are main nutrient forms for utilization and transportation, sucrose and reducing sugar are the main forms of total soluble sugar in the bulbs. Based on two years' experimentation results in the mountainous region, it was found...