Abstract:

Changes in endogenous hormones in terminal bud of Lilium davidii var. unicolor bulbs during the 101 days storage at 2 ℃,6 ℃ and 10 ℃ in moist sawdust were studied. And the regression analyses step by step were performed farther between carbohydrate,phenols,arginine and endogenous hormones. The results indicated that abscisic acid (ABA) content decreased and gibberellic acid (GA₃),indole acetic acid (IAA) and zeatinriboside (ZR) had the increase phase during storage. As the storage temperature declined,contents of ABA and GA₃ decreased,furthermore,the lower temperature was,the earlier ABA content decreased. Correlation analysis revealed that there was no any correlations between GA₃ and ABA level. Significantly negative correlations between ABA content and amylase activity,total soluble sugar content,phenylalanine ammonia-lyase (PAL) activity,phenols content were observed. But there were markedly positive correlations between GA₃ or ZR level and above substances. Results of path analysis showed that the negative effect of ABA was all-important,the positive effect of GA₃ in the next place and effect of ZR was little. There was remarkable positive correlation between arginine and ABA concentration. It was primarily concluded that endogenous ABA was the central inhibitor and GA₃ was not the essential factor for amylase activity increase in bud.

Key words: Lilium davidii var. unicolor, dormancy, endogenous hormones, regulating