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Plant Diversity ›› 1990, Vol. 12 ›› Issue (04): 1-3.

• 研究论文 •    

天麻球茎几丁质酶和β-1,3-葡聚糖酶的初步研究

杨增明 胡忠   

  1. 中国科学院昆明植物研究所
  • 出版日期:1990-08-25 发布日期:1990-08-25

A PRELIMINARY STUDY ON THE CHITINASE AND P-1,3-GLUCANASE IN CORMS OF GASTRODIA ELATA

Yang Zengming Hu Zhong   

  1. Kunming Institute of Botany, Academia Sinica
  • Online:1990-08-25 Published:1990-08-25

摘要: 天麻(Gastrodia elata)是真菌寄生植物。密环菌侵入初生球茎并在其皮层被消化,营养物供次生球茎生长需要;密环菌不能侵染生长中的次生球茎。我们从初生球茎分离并纯化了几了质酶和β-1,3-葡聚糖酶,分子量各为31.5 kD和94kD,得率各为0.8和0.4mg/100 g鲜重。纯化几了质酶的内切酶比活为208 nmol GlcNAcs-1mg-1,外切酶比活为 4.1nmol GlcNAcs-1mg-1;纯化葡聚精酶比活为546 nmol Glc s-1mg-1。以相同鲜重计,初生球茎中二种酶的总活性各为次生球茎的34和56倍;这主要是由于次生球茎的酶比活性很低。二种酶对平板上培养的木霉菌丝的生长均有抑制作用,但抑菌活性均较天麻抗真菌蛋白(GAFP)低。我们认为这两种酶在天麻初生球茎消化密环菌菌丝的过程中起重要作用,而对天麻球茎阻止和限制密环菌侵染的抗菌作用贡献甚少,后者主要属于天麻抗真菌蛋白。

关键词: 天麻, 几丁质酶, β-1, 3-葡聚糖酶

Abstract: Gastrodia elaia is a plant parasitic on fungi Armillariella mellea The mycelia infect the primary corm of the plant, and are arrested and digested by the corm at its cortex layer; the released nutrients are mainly transported to the secondary corm which can prevent the infection of the fungus.

Key words: Gastrodia elata