【Key words】 Picea mongolica； Callus； Sucrose content； Sucrose enzyme activity；
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Sugarcane smut caused by Ustilago scitaminea Syd. is one of the most important disease in sugarcane. It has spread out all over the world and causes serious loss in stalk yield and sucrose content in susceptible varieties.
由黑粉菌(Ustilago scitaminea Syd．)引起的甘蔗黑穗病是甘蔗栽培上最主要的病害之一，在世界各植蔗区普遍发生，造成感病品种蔗茎产量和蔗糖分的严重损失，在旱地甘蔗上为害更为严重，培育抗病品种是最有效的措施。
参考来源 - 甘蔗抗黑穗病性检测SCAR标记的建立·2,447,543篇论文数据，部分数据来源于NoteExpress
蔗糖酶：使蔗糖分解成为葡萄糖和果糖的酶。
Sucrase an enzyme that breaks down sucrose into glucose and fructose.
由数千或更多的半个蔗糖分子D-葡萄糖构成葡聚糖、淀粉和纤维素；
From thousands or more D-glucose moieties of sucrose the glucans, starch and cellulose, are built.
纤维分和还原糖分对甘蔗蔗糖分分别具有较大的直接和间接负效应；
Fibre content and reducing sugar percentage respectively had stronger direct and indirect negative effect against sugar content in cane.
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