山定子感染南京毛刺线虫后几种生理生化物质的变化

CHANGE OF PHYSIOCHEMICAL SUBSTANCES IN Malus baccata INFECTED WITH Trichodorus nanjingensis

山定子（ＭａｌｕｓｂａｃａｔａＢｏｒｋｈ．）在遭到南京毛刺线虫（ＴｒｉｃｈｏｄｏｒｕｓｎａｎｊｉｎｇｅｎｓｉｓＬｉｕ＆Ｃｈｅｎ）侵染以后，根尖组织中很多生理生化物质都发生了病态的变化。结果表明：处理和对照相比，游离脯氨酸（Ｐｒｏ）含量、还原糖（ＲＣ）含量、过氧化物酶（ＰＯＤ）活性、多酚氧化酶（ＰＰＯＤ）活性、苯丙氨酸解氨酶（ＰＡＬ）活性和细胞壁中羟脯氨酸（Ｈｙｐ）含量均有不同程度的增加，总糖含量降低；并且在侵染初期和侵染后期，各种物质的变化幅度不同，游离脯氨酸含量、还原糖含量、３种酶活性在侵染前期增加的幅度大，细胞壁中羟脯氨酸含量是侵染后期增加的幅度大，而总糖含量是侵染后期降低的幅度大。这些物质的变化趋势揭示了山定子感染南京毛刺线虫的病症生理。

Morbid changes of some Physiochemical substances were found in the roottip tissues of Malus baccata infected with Trichodorus nanjingensis.These changes included the rise of the content of free proline, reduced carbohydrate and hydroproline in cell wall as well as the activity of POD PPOD and PAL. Furthermore, the changing range of all tested substances was different. The increasing range of free proline, reduced carbohydrate and the activity of three kinds of enzymes at early stage was bigger than at later stage but the increasing range of hydroproline was smaller at early stage than at later stage. The decreasing range of total carbohydrate was smaller at early stage than at later stage. The changing tendency of above substances shed light upon the physiopathology of M. baccata infected with T. nanjingensis.