菌株Stenotrophomonassp．ZS-S-01去除菜心中残留高效氯氰菊酯和氰戊菊酯农药的作用

Effects of Stenotrophomonas sp.Strain ZS-S-01 on the Degradation of β-Cypermethrin and Fenvalerate Residue on Flowering Chinese Cabbage

通过室内盆栽和田间小区试验,评价降解菌株Stenotrophomonas sp.ZS-S-01去除菜心中残留高效氯氰菊酯和氰戊菊酯农药的效果.室内盆栽试验结果表明,处理72 h后,菜心中高效氯氰菊酯和氰戊菊酯的降解率分别为71.1%和65.9%,残留量分别为0.28和0.35 mg/kg,降解半衰期(T1/2)分别为26.3和29.2 h,与对照相比,T1/2分别缩短了57.2和34.1 h.田间小区试验结果表明,处理72 h后,菜心中高效氯氰菊酯和氰戊菊酯的降解率分别为63.2%和54.0%,残留量分别为0.35和0.46 mg/kg,T1/2分别为27.7和32.1 h,与对照相比,T1/2分别缩短了34.2和15.4 h.可见,降解菌株ZS-S-01可有效去除菜心中高效氯氰菊酯和氰戊菊酯农药残留.处理72 h后,菜心中高效氯氰菊酯和氰戊菊酯残留量均低于国家叶菜类蔬菜中最大残留限量(MRLs),显示该菌具有进一步开发的潜力.

The effects of Stenotrophomonas sp. strain ZS-S- 01 on the degradation of β-cypermethrin and fenvalerate residue on flowering Chinese cabbage （Brassica campestris L. ） were investigated by pot and field plot experiments, respectively. The results from the pot experiments showed that the residue of β- cypermethrin and fenvalerate on flowering Chinese cabbage treated with strain ZS-S-01 were reduced by 71.1% and 65.9% after 72 h, leaving 0. 28 and 0. 35 mg/kg. Furthermore, the half lives （TilE） of β- cypermethrin and fenvalerate treated with strain ZS-S-01 were 26. 3 and 29.2 h, reduced by 57.2 and 34. 1 h compared with the control. The results from the field plot experiments showed that the residue of β-cypermethrin and fenvalerate on flowering Chinese cabbage treated with strain ZS-S-01 were reduced by 63.2% and 54.0% after 72 h, leaving 0. 35 and 0. 46 mg/kg. The T1/2 of β-cypermethrin and fenvalerate were 27.7 and 32. 1 h, reduced by 34.2 and 15.4 h compared with the control. The 72-hour residual values of β-cypermethrin and fenvalerate on flowering Chinese cabbage treated with strain ZS-S-01 were all lower than those of the corresponding maximum residue levels of China （MRLs）. These results indica- ted that strain ZS-S-01 could effectively remove these pyrethroid residue from flowering Chinese cabbage. These results highlighted that strain ZS-S-01 might possess potential usage for bioremediation of pyrethroid-contaminated vegetables.