南方根结线虫侵染对不同烟草品种生理生化指标的影响

Effects of Meloidogyne incognitaInfection on Physiological and Biochemical Indexes of Different Tobacco Varieties

为烟草抗南方根结线虫育种研究提供科学依据,在盆栽条件下,采用人工接种方法研究不同抗性烟草品种受南方根结线虫侵染后其根系生理生化指标的变化规律。结果表明:受南方根结线虫侵染后,抗病烟草品种G28根系的过氧化物酶(POD)、过氧化氢酶(CAT)、苯丙氨酸解氨酶(PAL)和酪氨酸解氨酶(TAL)总体活性和在2次侵染前期酶活的增加幅度均较感病品种长脖黄大,但超氧化物酶(SOD)活性及丙二醛(MDA)含量均低于长脖黄。较高的PAL、TAL、POD和CAT活性能提高烟草抗南方根结线虫能力。

Two tobacco varieties with different resistance to M.incognita are inoculated with M.incognita under the pot condition and then the variation regularity of physiological and biochemical indexes of two tobacco varieties is studied to provide the scientific basis for resistance breeding of tobacco M.incognita.Results:The overall POD,CAT,PAL and TAL activity of G28(a variety with resistance to M.incognita)after inoculation and the increasing range of these enzyme activity at early inoculation stage both are higher than Changbohuang variety(a susceptible variety)but the SOD activity and MDA content of G28 are lower than Changbohuang.In conclusion,the higher PAL,TAL,POD and CAT activity can improve resistance to M.incognitain tobacco.