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A procedure was developed to obtain non-embryogenic callus and regenerated lines from root segments of Zea mays grown in aseptic conditions. The activity of glutathione-S-transferases (GSTs), for non-embryogenic callus, was determined toward 1-chloro-2,4-dinitrobenzene (CDNB) and it was compared with that obtained for corn seedlings grown without hormones. For the callus masses, increases of specific activity toward CDNB and the kinetic parameter Vmax were observed with respect to corn seedlings. The procedure permitted the regenerating of tissues from callus explants, therefore the GST(CDNB) activity and the effect of the safener benoxacor on its expression were investigated for the regenerated tissues grown in agarized substrate and in liquid medium. These explants showed a constitutive GST(CDNB) activity higher than corn seedlings and this activity was increased, for both tissues, in response to the presence of the safener benoxacor in the growing medium. The GST activity for the above tissues was also assayed toward benoxacor and terbuthylazine, metolachlor and fluorodifen herbicides. Measurable GST activity was found toward some of the above chemicals and it was found to be significantly enhanced in response to benoxacor treatment. 相似文献
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Sublethal effects of terbuthylazine and carbofuran on the growth and reproduction of Eisenia andrei were investigated over a period of three generations. Reproduction was assessed by measuring the coccon production of worms treated chronically with pesticides. Inhibition of cocoon production was found in the parental generation. Hatchlings were raised from cocoons to provide the F1 generation. During raising a more rapid growth of juveniles treated with terbuthylazine was observed, compared with the growth of untreated worms. The increase in vitality was also found in cocoon production. Groups treated with terbuthylazine produced more cocoons than controls. The F2 generation was raised from hatchlings of the F1 generation, and here, also the terbuthylazine treatments increased earthworm growth, but not cocoon production. Exposure to carbofuran decreased cocoon production in all generations. Growth of the F1 generation was not influenced by low concentrations of carbofuran. 相似文献
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目前国内对除草剂中特丁津含量分析的方法尚无国家标准或行业标准,国际杀虫剂分析协作委员会(CIPAC)采用的含量检验方法为气相色谱法,分离效果不稳定。鉴此,以Shimadzu10-A VP Plus高效液相色谱仪和Kromasil 100-5-C18不锈钢色谱柱建立了测定特丁津含量的高效液相色谱分析方法,流动相:甲醇-水(70∶30),流速:1.0 mL/min,柱温:室温,检测波长:224 nm,进样量20μL。测定结果表明,特丁津在2~100 mg/L的范围内线性关系良好(r=0.999 995),平均回收率为99.78%(RSD=0.000 42)。该方法简便、新颖,具有准确、快速、精密度好等优点。 相似文献
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