关键词: 杜仲, 形成层活动, 多糖贮量, 淀粉酶同工酶

Abstract: The polysaccharide granules in tissues of Eucommia ulmoides stained noblue-black with I-KI solution and showed no anisotropy under polarized microscope. The seasonal changes of polysaccharide granules in the pith, xylem and cortex parenchyma of the shoots were mere related to the annual cycle of cambial activity. Polysaccharide granules accumulated from the end of May to mid-December, and degraded gradually until mid-April of thefollowing year. A few polysaccharide granules existed in the phloem parenchymaand their variation was less obvious than that in xylem and cortex. Zymogramphy of amylase isozymes was different among tissues. Albeit the enzyme activities changed during the annual cycle of cambial activity, but showed no interrelation with the accumulation and degradation of polysaccharide granules.

Key words: Eucommia ulmoides Oliv., Cambial activation, polysaccharide granules, amylase isozyme