The Regulation Mechanisms Of Endogenous Hormones And Proteins On Bulb Development In Lilium

This dissertation was performed to investigate the endogenous hormones and protein changes during bulb formation and development of Lilium 'Oriental Hybrids' (cv. 'Sorbonne') on the base of the former researches. Through the experiment, it will lay the foundation of control mechanism during bulblet's formation and bulb development. It will also contribute to provide a theoretical basis on commercial bulbs producing in our country. The main results were summarized as follow:1. High temperature and high humidity environment are propitious to induce new bulbs from Lily's cutting scales in summer. The percentage of scales that forming tubers is 273.47% after 16 days.2. The results were concluded as the contents of IAA, ZR and GA3 accelerated to form the new bulblets. ABA and JA were regarded as the strong inhibitors during the bulb formation. Three kinds of enzymes are all closely related to the bulblet formation.3. During bulb development, IAA and GA3 were the hormones which promote bulb develop. ABA and JA accelerated aging of the aboveground part, and transferred nutrition to the underground, but ZR had a little relationship with bulb expansion. In the exterior scale, Correlation analysis showed that ADPGPase and SSSase were the key enzymes for starch synthesis. In the interior scale, the SSSase activity had high relevant with the starch, it was the key enzyme for synthesizing starch in bulb development. When we took November 1st as the harvest period, the content of endogenous hormones and the activity of the starch synthesis have dropped greatly, the results show that the bulb has been in nutrient consuming phase.