INTRODUCTION Acanthopanax giraldii Harms is a Araliaceae deciduous shrub plant and mainly locates in Sichuan, Gansu, Ningxia provinces, China. The stem bark of A. giralidii is used as a material for traditional Chinese medicinal (Tibetan medicine) and the essential biological active ingredients are polysaccharide, adenosine, hyperoside, chlorogenic acid and isofraxidin 1-5 , which has long been used in the treatment of rheumatism, immunomodulation, antitumor, antiinflammation and antivirus [6]

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... 7] [8] [9] . Every year, the annual branch barks were harvested in May and the medicinal herbs production depends on the length and numbers of annual branches. Interestingly, our recent study has discovered that the stronger germination ability at the branches, the more branches of each stubbles grow. Averagely, 2.04 more branches will grow. This phenomenon is known as 'the more cutting, the more lush'. It is believed that this is the result of plant hormone regulation. The plant hormones are important natural mediate substances which regulate the processes in plant's life cycle, for instance, differentiation, morphogenesis, growth and metabolism [10] [11] [12] [13] [14] . On the basis of the structure and physiological function, hormones are categorized into several major classes including cytokinins, abscisic acid (ABA), auxins, gibberellins (GA), jasmonates (JA), ethylene and salicylic acid 15 .