【摘要】 为探讨无机盐和有机盐对南方根结线虫的作用方式,在室内利用沙柱法和染色法测定了二者对南方根结线虫2龄幼虫迁移能力及侵入番茄根部能力的影响。结果表明,随着各盐处理浓度的增加,南方根结线虫2龄幼虫的迁移能力和侵入能力显著降低。在4μg/m L KSCN、C6H8O7、KCl、KH2PO4、KHCO3和Mn SO4·H2O沙柱中,15 d后2龄幼虫的平均迁移距离最小,分别为0、0.33、0.52、0.53、0.55和0.58 cm,而对照为0.94 cm。2龄幼虫在Ba NO3、K2HPO4、KHCO3、Cs Cl和KSCN各浓度沙柱中的平均迁移距离均小于0.94 cm。2μg/m L NH4NO3、KH2PO4、(NH4)2CO3、Cs Cl、(NH4)2SO4、Na SCN和NH4SCN处理15 d后,2龄幼虫对番茄根部的侵入率最低,分别为1%、2.33%、1.33%、2%、2%、1%和1.67%。表明对2龄幼虫侵入番茄根部抑制效果最明显的盐为NH4NO3、KH2PO4、(NH4)2CO3、Cs Cl、(NH4)2SO4、Na SCN和NH4SCN。更多还原

【Abstract】 In order to determine the action mode of inorganic salts and organic salts on southern root-knot nematode,Meloidogyn incognita,the effects of these salts on motility and infectivity of the second-stage juveniles( J2) of M. incognita were evaluated with a sand column and the staining method,respectively.The results showed that J2 motility and infectivity were significantly reduced with salt concentration increasing. The average migration distance of J2 reached 0,0. 33,0. 52,0. 53,0. 55 and 0. 58 cm after15 days in the sand column mixed with 4 μg / m L KSCN,C6H8O7,KCl,KH2PO4,KHCO3 and Mn SO4·H2O,respectively,while it was 0. 94 cm in the control. The average migration distance in the treatments with Ba NO3,K2HPO4,KHCO3,Cs Cl and KSCN at different concentrations was less than 0. 94 cm. The infectivity of J2 after treatment with 2 μg / m L NH4NO3,KH2PO4,( NH4)2CO3,Cs Cl,( NH4)2SO4,Na SCN and NH4 SCN for 15 d were 1%,2. 33%,1. 33%,2%,2%,1% and 1. 67%,respectively.The results indicated that the salts including NH4NO3,KH2PO4,( NH4)2CO3,Cs Cl,( NH4)2SO4,Na SCN and NH4 SCN had the strongest inhibition to the infectivity of J2.更多还原