[目的]研究蜡样芽孢杆菌JK14对小麦全蚀病菌的抑制作用及防治效果,探讨该菌的抑病机理。[方法]从小麦根际土壤分离得到蜡样芽孢杆菌(Bacillus cereus)JK14拮抗菌株,室内测定其带菌培养液对小麦全蚀病菌(Gaeumannomyces graminis var tritici)9826菌株和9812菌株的抑制效果,探讨拮抗菌对小麦全蚀病的作用机理。利用逐步增加浓度的方法获得对利福平和全蚀菌具有抗性的双抗菌株JK1*4,对该菌在小麦体内定殖情况进行了研究。[结果]盆栽试验中,JK14对9826菌株和9812菌株的防治效果为63%和59%,高于化学杀菌剂处理的55%和51%。该菌株可以造成病菌菌丝畸变和菌丝细胞壁瓦解。JK14*在小麦根系中具有一定的消长动态,种子上的JK14*菌可以随种子发芽、生根而扩展至根部,但是单位组织上菌体数量逐渐减少。[结论]室内试验表明,蜡样芽孢杆菌JK14对小麦全蚀病有一定的防治效果。
2-nitro-10-hydroxy-5,10-dihydrophenophosphazine-10-oxide can be reduced easily with hydrous hydrazine by Fe/MgO catalyst.The reduced compound was detected by IR and HNMR.It showed that the reduction yield is 94%.The catalyst can be used in reduction for three times.This reduction method has a lower cost,less pollution to environment and suit to the industrializing demand for dye intermediate production.
