抗生素对小麦根际优势微生物生长的影响

研究了小麦根际6株优势菌,包括4株细菌(B1,B2,B3,B4)和2株放线菌(F1,F2)对常用饲料用抗生素金霉素(CTC)和青霉素(PNC)的敏感性.在两种抗生素浓度分别为0μg.L-1,10μg.L-1,100μg.L-1,500μg.L-1,1 000μg.L-1的液体培养基中,6株菌的生长情况有较大差异:其中B1和F1在1 000μg.L-1的金霉素浓度下能正常生长,而B4和F2分别在100μg.L-1和500μg.L-1的金霉素浓度下生长完全受到抑制;另外,B3在1 000μg.L-1青霉素浓度下生长情况良好,而F1,F2和B4在青霉素环境中的生长受到明显抑制.

Influence of Antibiotics on the Growth of Bacterial Strains Dominant in Wheat Rhizosphere

6 strains of dominant microorganisms in wheat rhizosphere including 4 bacteris(B1,B2,B3,B4) and 2 actinomycetes(F1,F2) have been selected for studying sensitivity to penicillin(PNC) and aureomycin(CTC) which are usually used in feeding stuff.The results indicate that sensitivity of the dominant microorganisms is different under the tested antibiotic concentrations of 0 μg·L-1,10 μg·L-1,100 μg·L-1,500 μg·L-1,1 000 μg·L-1.B1 and F1 could not be inhibited at any dosage of CTC,but the inhibition of B4 and F2 could be observed at the dosage of 100 μg·L-1 CTC and 500 μg·L-1 CTC;B3 could also grow well at any dosage of PNC,but PNC could completely inhibit the growth of F1,F2 and B4.